We thank Zhaohua Irene Tang in the W. M. Keck Science Department for the use of her epifluorescence microscope and the Werren lab for donating Nasonia for dissections. This work was supported in part by an NIH-NRSA fellowship (5F32GM105317-02) to AML.

<ol>
	<li>Blattes, R., Kas, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluorescent+in+situ+hybridization+(FISH)+on+diploid+nuclei+and+mitotic+chromosomes+from+Drosophila+melanogaster+larval+tissues.">Fluorescent in situ hybridization (FISH) on diploid nuclei and mitotic chromosomes from Drosophila melanogaster larval tissues.</a> Cold Spring Harbor Protocols. 2009 (9), (2009).</li><li>Dimitri, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluorescent+in+situ+hybridization+with+transposable+element+probes+to+mitotic+chromosomal+heterochromatin+of+Drosophila.">Fluorescent in situ hybridization with transposable element probes to mitotic chromosomal heterochromatin of Drosophila.</a> Methods in Molecular Biology. 260, 29-39 (2004).</li><li>Pardue, M. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+situ+hybridization+to+polytene+chromosomes+in+Drosophila+using+digoxigenin-labeled+probes.">In situ hybridization to polytene chromosomes in Drosophila using digoxigenin-labeled probes.</a> Cold Spring Harbor Protocols. 2011 (8), 1003-1006 (2011).</li><li>Hoskins, R. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Heterochromatic+sequences+in+a+Drosophila+whole-genome+shotgun+assembly.">Heterochromatic sequences in a Drosophila whole-genome shotgun assembly.</a> Genome Biology. 3 (12), (2002).</li><li>Hoskins, R. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sequence+finishing+and+mapping+of+Drosophila+melanogaster+heterochromatin.">Sequence finishing and mapping of Drosophila melanogaster heterochromatin.</a> Science. 316 (58331), 1625-1628 (2007).</li><li>Treangen, T. J., Salzberg, S. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Repetitive+DNA+and+next-generation+sequencing:+computational+challenges+and+solutions.">Repetitive DNA and next-generation sequencing: computational challenges and solutions.</a> Nature Reviews Genetics. 13 (1), 36-46 (2012).</li><li>He, B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mapping+the+pericentric+heterochromatin+by+comparative+genomic+hybridization+analysis+and+chromosome+deletions+in+Drosophila+melanogaster.">Mapping the pericentric heterochromatin by comparative genomic hybridization analysis and chromosome deletions in Drosophila melanogaster.</a> Genome Research. 22 (12), 2507-2519 (2012).</li><li>Pimpinelli, S., Bonaccorsi, S., Fanti, L., Gatti, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluorescent+in+situ+hybridization+(FISH)+of+mitotic+chromosomes+from+Drosophila+larval+brain.">Fluorescent in situ hybridization (FISH) of mitotic chromosomes from Drosophila larval brain.</a> Cold Spring Harbor Protocols. 2010 (3), (2010).</li><li>Larracuente, A. M., Noor, M. A., Clark, A. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Translocation+of+Y-linked+genes+to+the+dot+chromosome+in+Drosophila+pseudoobscura.">Translocation of Y-linked genes to the dot chromosome in Drosophila pseudoobscura.</a> Molecular Biology and Evolution. 27 (7), 1612-1620 (2010).</li><li>Ferree, P. M., Barbash, D. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Species-specific+heterochromatin+prevents+mitotic+chromosome+segregation+to+cause+hybrid+lethality+in+Drosophila.">Species-specific heterochromatin prevents mitotic chromosome segregation to cause hybrid lethality in Drosophila.</a> PLoS Biology. 7 (10), e1000234 (2009).</li><li>Williams, B. C., Karr, T. L., Montgomery, J. M., Goldberg, M. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Drosophila+l(1)zw10+gene+product,+required+for+accurate+mitotic+chromosome+segregation,+is+redistributed+at+anaphase+onset.">The Drosophila l(1)zw10 gene product, required for accurate mitotic chromosome segregation, is redistributed at anaphase onset.</a> The Journal of Cell Biology. 118 (4), 759-773 (1992).</li><li>Gatti, M., Bonaccorsi, S., Pimpinelli, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Looking+at+Drosophila+Mitotic+Chromosomes.">Looking at Drosophila Mitotic Chromosomes.</a> Methods in Cell Biology. 44, 371-391 (1994).</li><li>Werren, J. H., Stouthamer, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=PSR+(paternal+sex+ratio)+chromosomes:+the+ultimate+selfish+genetic+elements.">PSR (paternal sex ratio) chromosomes: the ultimate selfish genetic elements.</a> Genetica. 117 (1), 85-101 (2003).</li></ol>

The authors declare that they have no competing financial or any other conflict of interest.

DNA ISH משמש לעתים קרובות כדי למפות רצפים ספציפיים לכרומוזומים. שתארנו שיטה פשוטה לDNA ISH מותאם לגבוה עותק מספר, רצפי heterochromatic. במקום להשתמש בשטיפות בתמיסת פוראמיד, אשר היא דרישה בפרוטוקולי ISH DNA קיימים אחרים, אנו שמים שקופיות רכוב רקמה ישירות על בלוק מחומם מראש ללפגל DNA. שי?...

DNA הכלאה באתר (DNA ISH) הוא שיטה נפוצות לרצפי מיפוי לאזורים של כרומוזום מסוימים. יכולות להיות שנוצרו בדיקות לאזורי עותק יחידים בתוך euchromatin באמצעות קומץ של גישות, כולל nick-תרגום או בסופו תיוג של מוצרי DNA ארוכים 1,2 ושילוב של deoxygenin (DIG) נוקלאוטידים -attached וההכרה שלהם באמצעות מגוון רחב של נוגדנים-מצומדות קבוצה 1-3. ויזואליזציה של רצפי euchromatic בעותק מספר מעטים או בודד מחייבת השימוש בשני בדיקות יחידים, גדולות עם פעילות ספציפית גבוהה או קוקטייל של בדיקות מרובות, קטנות יותר, כי באופן קולקטיבי לשפר אות. בניגוד לכך, חוזר על עצמו מאוד רצפים נמצאו בheterochromatin, כגון DNAs לווין, הם מטרות קלים יותר לDNA ISH מכיוון שהם קיימים בדרך כלל כעשרות אלפי חזרות התקבצו באזורי כרומוזום יחידים הידועים כלוקים. אלמנטים ניידים גם יכולים להיותנמצא במספרים גבוהים בעותק לוקוסי כרומוזומליות שונים 2. במקרים אלה, בדיקות יחידים עם פעילות ספציפית נמוכה יכולות למעשה תווית רצפי heterochromatic בשל ההכלאה שלהם באתרים מרובים. בדיקות רצפים חוזרים יכולות להיות מסונתזת oligonucleotides הקצר מסחרי כ( 30-50 נ&quot;ב) וכימיות מצומדות עם כל קבוצות ניאון שונות מרובות. מיפוי רצפים חוזרים בתוך heterochromatin על ידי שימוש בטכנולוגיות הגנום רצף קשה בשל אתגרים נתקלו בפיגומי בניין בלוקי לווין חוזר על עצמו מאוד 4-6,7. נכון לעכשיו, איש עומד כדרך היעילה ביותר למיפוי רצפים אלה ברמה תת-כרומוזום. אסטרטגיה זו היא חשובה למיפוי מספרים גדולים של רצפים חוזרים הנחשפים על ידי מחקרי הגנום ורצף transcriptome מתמשכים. היעילות וקלות רצפים חוזרים מיפוי על כרומוזומים רכוב שקופיות תהיה GREמשופר atly על ידי פרוטוקול פשוט לDNA ISH. לדוגמא, פרוטוקולים קיימים לDNA ISH כרוכים שטיפות מרובות של רקמות הכלאה בפתרון פוראמיד 2,8, ובכך להוסיף משמעותי את הזמן הנדרש לרצפי מיפוי וגם לייצר כמויות גדולות של פסולת כימית למגיב יקר זה. כאן אנו מתארים שיטת DNA ISH מתוקנת שעוקפת את הצורך בשטיפת פוראמיד ומשתמש בציוד מעבדה בסיסי וחומרים כימיים. שיטה זו תוכננה במקור למיפוי המהיר של רצפי DNA חוזר על עצמו מאוד באזורי heterochromatic של neuroblasts זחל תסיסנית באמצעות oligos מסונתז מסחרי המצומדות עם צבעי הקרינה. עם זאת, שיטה זו פועלת גם למיפוי רצפים חוזרים באמצעות בדיקות גדולות יותר מסונתזים באמצעים אחרים 9,10 ועל פני סוגי רקמות וכרומוזום שונים מרובים. בנוסף, שיטה זו יכולה לשמש כדי למפות רצפי euchromatic באמצעות יותר או multiple, בדיקות קצרות בתוך רצף euchromatic של עניין.

<table border="0" cellpadding="0" cellspacing="0" width="542">
	<tbody>
		<tr height="17">
			<td height="17" style="height:17px;width:285px;"></td>
			<td style="width:257px;">Company</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Materials&#160;</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;"></td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Poly-L-lysine coated slides (regular slides also can be used)</td>
			<td>Sigma Aldrich</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Ultrafine tweezers (5 gauge)</td>
			<td>Dumont</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">22mmx22mm cover slips, Sigmacote-treated by immersion for 15 seconds, blotting dry, and wiping away all traces of Sigmacote so that cover slip is clear</td>
			<td>Fisher</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Sigmacote</td>
			<td>Sigma</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Filter paper (75-150mm)</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Paraffin wax paper</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Heat block with thermometer</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Dry incubator</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Razor blades</td>
			<td></td>
		</tr>
		<tr height="17">
			<td colspan="2" height="17" style="height:17px;">Humidity chamber (empty pipette tip box or Tupperware, lined with moistened paper towels or Kimwipes)</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Coplin jars (with slide grooves)</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Aluminum foil</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Pasteur pipettes</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">1.5 mL microfuge tubes</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Nail polish (clear or colored)</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">2-20 &#956;L micropipette and plastic tips</td>
			<td></td>
		</tr>
		<tr height="17">
			<td colspan="2" height="17" style="height:17px;">20-25 standard metal paperclips linked to form a chain</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;"></td>
			<td>Company/Notes</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Reagents</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;"></td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">16% EM grade paraformaldehyde</td>
			<td>Electron Microscopy Reagents</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Acetic acid</td>
			<td>Sigma</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Liquid nitrogen</td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;"></td>
			<td></td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">100% Ethanol, chemical grade</td>
			<td></td>
		</tr>
		<tr height="17">
			<td colspan="2" height="17" style="height:17px;">Commercially synthesized, fluorescently labeled oligos</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Long biotinylated probe (e.g. nick translated and biotinylated with BioNick from Invitrogen)</td>
			<td>Invitrogen; Alternative steps 2.7.1-2.7.3</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Rhodamine-Avidin (for detection of long biotinylated probe)</td>
			<td>Roche; Alternative steps 2.7.1-2.7.3</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Hybridization buffer</td>
			<td>Recipe below</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">4X SSCT (Saline-sodium citrate + Tween)</td>
			<td>Recipe below</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">0.1X SSC (Saline-sodium citrate)</td>
			<td>Recipe below</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Blocking solution</td>
			<td>Recipe below</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">SBT (SSC, Bovine serum albumin, Tween)</td>
			<td>Recipe below</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">1X PBT (Phosphate-buffered saline + Tween)</td>
			<td>Recipe below</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">1X PBS (Phosphate-buffered saline)</td>
			<td></td>
		</tr>
		<tr height="17">
			<td colspan="2" height="17" style="height:17px;">Hypotonic solution (0.5% sodium citrate in H2O)</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Formamide</td>
			<td>Sigma Aldrich</td>
		</tr>
		<tr height="17">
			<td height="17" style="height:17px;">Vectashield mounting medium with DAPI</td>
			<td>Vector laboratories</td>
		</tr>
	</tbody>
</table>

simple method for fluorescence dna in situ hybridization to squashed chromosomes

DNA הכלאה באתר (DNA ISH) הוא שיטה נפוצות לרצפי מיפוי לאזורים של כרומוזום מסוימים. גישה זו היא יעילה במיוחד במיפוי רצפים חוזרים מאוד לאזורי heterochromatic, שבו גישות חישוביות להתמודד עם אתגרי אוסרני. כאן אנו מתארים פרוטוקול יעיל עבור DNA ISH שעוקף שוטף פוראמיד שהם צעדים סטנדרטיים בפרוטוקולי DNA ISH אחרים. הפרוטוקול שלנו מותאם להכלאה עם בדיקות יחידים קצרות גדיל DNA שנושאים צבעי ניאון, אשר למעשה לסמן רצפי DNA חוזר על עצמו באזורי כרומוזומים heterochromatic על פני מספר סוגים שונים של רקמות חרקים של. עם זאת, יישומים ניתן להאריך להשתמש עם בדיקות ויזואליזציה של רצפי DNA עותק יחיד (לא חוזר על עצמו) גדולים יותר. אנו מדגימים שיטה זו על ידי מיפוי כמה רצפים חוזרים שונים לכרומוזומים מעוכים מדרוזופילה melanogaster תאים עצביים וNasoniaspermatocytes vitripennis. אנחנו מראים דפוסי הכלאה של שני חלליות קטנות, מסונתזים באופן מסחרי ולבדיקה גדולה יותר להשוואה. הליך זה משתמש ציוד מעבדה פשוט וריאגנטים, והוא אידיאלי לחוקרים שיש להם ניסיון מועט עם ביצוע DNA ISH.

כדי להדגים שיטה זו, אנו הכלאה סט של oligos המסונתזת מסחרי הקטנה ששונו כימיים עם conjugates ניאון (איור 2) ובדיקה ארוכה יותר biotinylated (שנעשתה באמצעות תרגום ניק של מוצר ה- PCR; איור 2), לכרומוזומים מכמה רקמות שונות סוגים (ראה טבלה 1). רצפי היעד כללו חזרות לווי...

Watch this Scientific Journal Video about Simple Method for Fluorescence DNA In Situ Hybridization to Squashed Chromosomes at JoVE.com

Simple Method for Fluorescence DNA In Situ Hybridization to Squashed Chromosomes

Here, we present a simple method for performing fluorescence DNA in situ hybridization (DNA ISH) to visualize repetitive heterochromatic sequences on slide-mounted chromosomes. The method requires minimal reagents and it is versatile for use with short or long probes, different tissues, and detection with fluorescence or non-fluorescence-based signals.

שיטה פשוטה DNA הקרינה<em&gt; באתר</em&gt; הכלאה לכרומוזומים &quot;סתמת

DNA in situ hybridization (DNA ISH) is a commonly used method for mapping sequences to specific chromosome regions. This approach is particularly ...

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Biology

Simple Method for Fluorescence DNA In Situ Hybridization to Squashed Chromosomes

17.9K Views.  University of Rochester. Here, we present a simple method for performing fluorescence DNA in situ hybridization (DNA ISH) to visualize repetitive heterochromatic sequences on slide-mounted chromosomes. The method requires minimal reagents and it is versatile for use with short or long probes, different tissues, and detection with fluorescence or non-fluorescence-based signals.

Video: Simple Method for Fluorescence DNA In Situ Hybridization to Squashed Chromosomes

Pyrosequencing: A Simple Method for Accurate Genotyping

Pharmacogenetic research benefits first-hand from the abundance of information provided by the completion of the Human Genome Project. With such a tremendous amount of data available comes an explosion of genotyping methods. Pyrosequencing(R) is one of the most thorough yet simple methods to date used to analyze polymorphisms. It also has the ability to identify tri-allelic, indels, short-repeat polymorphisms, along with determining allele percentages for methylation or pooled sample assessment. In addition, there is a standardized control sequence that provides internal quality control. This method has led to rapid and efficient single-nucleotide polymorphism evaluation including many clinically relevant polymorphisms. The technique and methodology of Pyrosequencing is explained.


Pyrosequencing(R) is one of the most thorough yet simple methods to date used to analyze polymorphisms. This method has led to rapid and efficient single-nucleotide polymorphism evaluation including many clinically relevant polymorphisms. The technique and methodology of Pyrosequencing is explained.

Pyrosequencing: שיטה פשוטה genotyping מדויק

Pharmacogenetic research benefits first-hand from the abundance of information provided by the completion of the Human Genome Project. With such a ...

Fluorescence in situ hybridization (FISH) Protocol in Human Sperm

Aneuploidies are the most frequent chromosomal abnormalities in humans. Most of these abnormalities result from meiotic errors during the gametogenic process in the parents. In human males, these errors can lead to the production of spermatozoa with numerical chromosome abnormalities which represent an increased risk of transmitting these anomalies to the offspring.
For this reason, the technique of fluorescence in situ hybridization (FISH) on sperm nuclei has become a protocol widely incorporated in the context of clinical diagnosis. This practice provides an estimate of the frequencies of numerical chromosome abnormalities in the gametes of the patients that seek for genetic reproductive advice.
To date, the chromosomes most frequently included in sperm FISH analysis are chromosomes X, Y, 13, 18 and 21.
This video-article describes, step by step, how to process and fix a human semen sample, how to decondense and denature the sperm chromatin, how to proceed to obtain sperm FISH preparations, and how to visualize the results at the microscope. Special remarks of the most relevant steps are given to achieve the best results.

Fluorescence in situ hybridization FISH Protocol in Human Sperm

This video-article describes, step by step, how to process a semen sample to achieve good-quality fluorescence in situ hybridization on human spermatozoa. Preparations obtained can be used for aneuploidy screening in the context of clinical diagnosis.

פלואורסצנציה באתרו הכלאה (FISH) פרוטוקול של זרע אדם

Aneuploidies are the most frequent chromosomal abnormalities in humans. Most of these abnormalities result from meiotic errors during the gametogenic ...

A High Throughput in situ Hybridization Method to Characterize mRNA Expression Patterns in the Fetal Mouse Lower Urogenital Tract

Development of the lower urogenital tract (LUT) is an intricate process. This complexity is evidenced during formation of the prostate from the fetal male urethra, which relies on androgenic signals and epithelial-mesenchymal interactions1,2. Understanding the molecular mechanisms responsible for prostate development may reveal growth mechanisms that are inappropriately reawakened later in life to give rise to prostate diseases such as benign prostatic hyperplasia and prostate cancer.
The developing LUT is anatomically complex. By the time prostatic budding begins on 16.5 days post conception (dpc), numerous cell types are present. Vasculature, nerves and smooth muscle reside within the mesenchymal stroma3. This stroma surrounds a multilayered epithelium and gives rise to the fetal prostate through androgen receptor-dependent paracrine signals4. The identity of the stromal androgen receptor-responsive genes required for prostate development and the mechanism by which prostate ductal epithelium forms in response to these genes is not fully understood. The ability to precisely identify cell types and localize expression of specific factors within them is imperative to further understand prostate development. In situ hybridization (ISH) allows for localization of mRNAs within a tissue. Thus, this method can be used to identify pattern and timing of expression of signaling molecules and their receptors, thereby elucidating potential prostate developmental regulators.
Here, we describe a high throughput ISH technique to identify mRNA expression patterns in the fetal mouse LUT using vibrating microtome-cut sections. This method offers several advantages over other ISH protocols. Performing ISH on thin sections adhered to a slide is technically difficult; cryosections frequently have poor structural quality while both cryosections and paraffin sections often result in weak signal resolution. Performing ISH on whole mount tissues can result in probe trapping. In contrast, our high throughput technique utilizes thick-cut sections that reveal detailed tissue architecture. Modified microfuge tubes allow easy handling of sections during the ISH procedure. A maximum of 4 mRNA transcripts can be screened from a single 17.5dpc LUT with up to 24 mRNA transcripts detected in a single run, thereby reducing cost and maximizing efficiency. This method allows multiple treatment groups to be processed identically and as a single unit, thereby removing any bias for interpreting data. Most pertinently for prostate researchers, this method provides a spatial and temporal location of low and high abundance mRNA transcripts in the fetal mouse urethra that gives rise to the prostate ductal network.

A High Throughput in situ Hybridization Method to Characterize mRNA Expression Patterns in the Fetal Mouse Lower Urogenital Tract

Here, we describe an efficient high throughput in situ hybridization (ISH) method for visualizing patterns of mRNA expression in developing fetal mouse prostate tissue sections. The method can be easily adapted to visualize mRNA expression patterns in other mouse tissues or in tissues from other species.

תפוקה גבוהה באתרו הכלאה שיטה לאפיון דפוסי ביטוי mRNA של העכבר עוברית בדרכי השתן ואברי המין התחתון

Development of the lower urogenital tract (LUT) is an intricate process. This complexity is evidenced during formation of the prostate from the fetal male ...

Detection of Viral RNA by Fluorescence in situ Hybridization (FISH)

Viruses that infect cells elicit specific changes to normal cell functions which serve to divert energy and resources for viral replication. Many aspects of host cell function are commandeered by viruses, usually by the expression of viral gene products that recruit host cell proteins and machineries. Moreover, viruses engineer specific membrane organelles or tag on to mobile vesicles and motor proteins to target regions of the cell (during de novo infection, viruses co-opt molecular motor proteins to target the nucleus; later, during virus assembly, they will hijack cellular machineries that will help in the assembly of viruses). Less is understood on how viruses, in particular those with RNA genomes, coordinate the intracellular trafficking of both protein and RNA components and how they achieve assembly of infectious particles at specific loci in the cell. The study of RNA localization began in earlier work. Developing lower eukaryotic embryos and neuronal cells provided important biological information, and also underscored the importance of RNA localization in the programming of gene expression cascades. The study in other organisms and cell systems has yielded similar important information. Viruses are obligate parasites and must utilise their host cells to replicate. Thus, it is critical to understand how RNA viruses direct their RNA genomes from the nucleus, through the nuclear pore, through the cytoplasm and on to one of its final destinations, into progeny virus particles 1.
FISH serves as a useful tool to identify changes in steady-state localization of viral RNA. When combined with immunofluorescence (IF) analysis 22, FISH/IF co-analyses will provide information on the co-localization of proteins with the viral RNA3. This analysis therefore provides a good starting point to test for RNA-protein interactions by other biochemical or biophysical tests 4,5, since co-localization by itself is not enough evidence to be certain of an interaction. In studying viral RNA localization using a method like this, abundant information has been gained on both viral and cellular RNA trafficking events 6. For instance, HIV-1 produces RNA in the nucleus of infected cells but the RNA is only translated in the cytoplasm. When one key viral protein is missing (Rev) 7, FISH of the viral RNA has revealed that the block to viral replication is due to the retention of the HIV-1 genomic RNA in the nucleus 8. 
Here, we present the method for visual analysis of viral genomic RNA in situ. The method makes use of a labelled RNA probe. This probe is designed to be complementary to the viral genomic RNA. During the in vitro synthesis of the antisense RNA probe, the ribonucleotide that is modified with digoxigenin (DIG) is included in an in vitro transcription reaction. Once the probe has hybridized to the target mRNA in cells, subsequent antibody labelling steps (Figure 1) will reveal the localization of the mRNA as well as proteins of interest when performing FISH/IF.

Detection of Viral RNA by Fluorescence in situ Hybridization FISH

A fluorescence in situ hybridization (FISH) method was developed to visually detect viral genomic RNA using fluorescence microscopy. A probe is made with specificity to the viral RNA that can then be identified using a combination of hybridization and immunofluorescence techniques. This technique offers the advantage of identifying the localization of the viral RNA or DNA at steady-state, providing information on the control of intracellular virus trafficking events.

זיהוי של רנ&quot;א נגיפי על ידי הקרינה<em&gt; באתרו</em&gt; הכלאה (דגים)

Viruses  that infect cells elicit specific changes to normal cell functions which serve  to divert energy and resources for viral replication. Many ...

High-throughput Physical Mapping of Chromosomes using Automated in situ Hybridization

Projects to obtain whole-genome sequences for 10,000 vertebrate species1 and for 5,000 insect and related arthropod species2 are expected to take place over the next 5 years. For example, the sequencing of the genomes for 15 malaria mosquitospecies is currently being done using an Illumina platform3,4. This Anopheles species cluster includes both vectors and non-vectors of malaria. When the genome assemblies become available, researchers will have the unique opportunity to perform comparative analysis for inferring evolutionary changes relevant to vector ability. However, it has proven difficult to use next-generation sequencing reads to generate high-quality de novo genome assemblies5. Moreover, the existing genome assemblies for Anopheles gambiae, although obtained using the Sanger method, are gapped or fragmented4,6.
Success of comparative genomic analyses will be limited if researchers deal with numerous sequencing contigs, rather than with chromosome-based genome assemblies. Fragmented, unmapped sequences create problems for genomic analyses because: (i) unidentified gaps cause incorrect or incomplete annotation of genomic sequences; (ii) unmapped sequences lead to confusion between paralogous genes and genes from different haplotypes; and (iii) the lack of chromosome assignment and orientation of the sequencing contigs does not allow for reconstructing rearrangement phylogeny and studying chromosome evolution. Developing high-resolution physical maps for species with newly sequenced genomes is a timely and cost-effective investment that will facilitate genome annotation, evolutionary analysis, and re-sequencing of individual genomes from natural populations7,8.
Here, we present innovative approaches to chromosome preparation, fluorescent in situ hybridization (FISH), and imaging that facilitate rapid development of physical maps. Using An. gambiae as an example, we demonstrate that the development of physical chromosome maps can potentially improve genome assemblies and, thus, the quality of genomic analyses. First, we use a high-pressure method to prepare polytene chromosome spreads. This method, originally developed for Drosophila9, allows the user to visualize more details on chromosomes than the regular squashing technique10. Second, a fully automated, front-end system for FISH is used for high-throughput physical genome mapping. The automated slide staining system runs multiple assays simultaneously and dramatically reduces hands-on time11. Third, an automatic fluorescent imaging system, which includes a motorized slide stage, automatically scans and photographs labeled chromosomes after FISH12. This system is especially useful for identifying and visualizing multiple chromosomal plates on the same slide. In addition, the scanning process captures a more uniform FISH result. Overall, the automated high-throughput physical mapping protocol is more efficient than a standard manual protocol.

High-throughput Physical Mapping of Chromosomes using Automated in situ Hybridization

Genome assemblies based on massively parallel DNA sequencing technologies are usually highly fragmented. The development of physical chromosome maps can potentially improve genome assemblies. Here, we demonstrate innovative approaches to chromosome preparation, fluorescent in situ hybridization, and imaging that significantly increase throughput of the physical map development.

תפוקה גבוהה מיפוי פיזי של הכרומוזומים באמצעות אוטומטי<em&gt; באתרו</em&gt; הכלאה

Projects to obtain whole-genome sequences for 10,000 vertebrate species1 and for 5,000 insect and related arthropod species2 are expected to take place ...

Visualization and Analysis of mRNA Molecules Using Fluorescence In Situ Hybridization in Saccharomyces cerevisiae

The Fluorescence in situ Hybridization (FISH) method allows one to detect nucleic acids in the native cellular environment. Here we provide a protocol for using FISH to quantify the number of mRNAs in single yeast cells. Cells can be grown in any condition of interest and then fixed and made permeable. Subsequently, multiple single-stranded deoxyoligonucleotides conjugated to fluorescent dyes are used to label and visualize mRNAs. Diffraction-limited fluorescence from single mRNA molecules is quantified using a spot-detection algorithm to identify and count the number of mRNAs per cell. While the more standard quantification methods of northern blots, RT-PCR and gene expression microarrays provide information on average mRNAs in the bulk population, FISH facilitates both the counting and localization of these mRNAs in single cells at single-molecule resolution.

Visualization and Analysis of mRNA Molecules Using Fluorescence In Situ Hybridization in Saccharomyces cerevisiae

This protocol describes an experimental procedure for performing Fluorescence in situ Hybridization (FISH) for counting mRNAs in single cells at single-molecule resolution.

הדמיה וניתוח של מולקולות ה-mRNA באמצעות הקרינה<em&gt; באתרו</em&gt; הכלאה ב<em&gt; Cerevisiae Saccharomyces</em

The Fluorescence in situ Hybridization (FISH) method allows one to detect nucleic acids in the native cellular environment. Here we provide a protocol for ...

MicroRNA In situ Hybridization for Formalin Fixed Kidney Tissues

In this article we describe a method for colorimetric detection of miRNA in the kidney through in situ hybridization with digoxigenin tagged microRNA probes. This protocol, originally developed by Kloosterman and colleagues for broad use with Exiqon miRNA probes1, has been modified to overcome challenges inherent in miRNA analysis in kidney tissues. These include issues such as structure identification and hard to remove residual probe and antibody. Use of relatively thin, 5 mm thick, tissue sections allowed for clear visualization of kidney structures, while a strong probe signal was retained in cells. Additionally, probe concentration and incubation conditions were optimized to facilitate visualization of microRNA expression with low background and nonspecific signal. Here, the optimized protocol is described, covering the initial tissue collection and preparation through the mounting of slides at the end of the procedure. The basic components of this protocol can be altered for application to other tissues and cell culture models.

MicroRNA In situ Hybridization for Formalin Fixed Kidney Tissues

This article describes an in situ hybridization protocol optimized for colormetric detection of microRNA expression in formalin fixed kidney sections.

MicroRNA<em&gt; באתרו</em&gt; הכלאה לרקמות כליה פורמלין קבועה

In this article we describe a method for colorimetric detection of miRNA in the kidney through in situ hybridization with digoxigenin tagged microRNA ...

Combined DNA-RNA Fluorescent In situ Hybridization (FISH) to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells

Fluorescent in situ hybridization (FISH) is a molecular technique which enables the detection of nucleic acids in cells. DNA FISH is often used in cytogenetics and cancer diagnostics, and can detect aberrations of the genome, which often has important clinical implications. RNA FISH can be used to detect RNA molecules in cells and has provided important insights in regulation of gene expression. Combining DNA and RNA FISH within the same cell is technically challenging, as conditions suitable for DNA FISH might be too harsh for fragile, single stranded RNA molecules. We here present an easily applicable protocol which enables the combined, simultaneous detection of Xist RNA and DNA encoded by the X chromosomes. This combined DNA-RNA FISH protocol can likely be applied to other systems where both RNA and DNA need to be detected.

Combined DNA-RNA Fluorescent In situ Hybridization FISH to Study X Chromosome Inactivation in Differentiated Female Mouse Embryonic Stem Cells

Fluorescent in situ hybridization (FISH) allows the detection of nucleic acids in their native environment within cells. We here describe a protocol for the combined, simultaneous detection of RNA and DNA by means of FISH, which can be used to study X chromosome inactivation in mouse embryonic stem cells.

DNA-RNA בשילוב פלורסנט<em&gt; באתרו</em&gt; הכלאה (דגים) לחקר איון כרומוזום X בתאי גזע הבדיל נקבה עכבר עוברי

Fluorescent in situ hybridization (FISH) is a molecular technique which enables the detection of nucleic acids in cells. DNA FISH is often used in ...

A Whole Mount In Situ Hybridization Method for the Gastropod Mollusc Lymnaea stagnalis

Whole mount in situ hybridization (WMISH) is a technique that allows for the spatial resolution of nucleic acid molecules (often mRNAs) within a &#39;whole mount&#39; tissue preparation, or developmental stage (such as an embryo or larva) of interest. WMISH is extremely powerful because it can significantly contribute to the functional characterization of complex metazoan genomes, a challenge that is becoming more of a bottleneck with the deluge of next generation sequence data. Despite the conceptual simplicity of the technique much time is often needed to optimize the various parameters inherent to WMISH experiments for novel model systems; subtle differences in the cellular and biochemical properties between tissue types and developmental stages mean that a single WMISH method may not be appropriate for all situations. We have developed a set of WMISH methods for the re-emerging gastropod model Lymnaea stagnalis that generate consistent and clear WMISH signals for a range of genes, and across all developmental stages. These methods include the assignment of larvae of unknown chronological age to an ontogenetic window, the efficient removal of embryos and larvae from their egg capsules, the application of an appropriate Proteinase-K treatment for each ontogenetic window, and hybridization, post-hybridization and immunodetection steps. These methods provide a foundation from which the resulting signal for a given RNA transcript can be further refined with probe specific adjustments (primarily probe concentration and hybridization temperature).

A Whole Mount In Situ Hybridization Method for the Gastropod Mollusc Lymnaea stagnalis

The goal of this protocol is to provide users with a set of methods for the high-throughput decapsulation of Lymnaea stagnalis embryos and larvae in preparation for whole mount in situ hybridization, and for subsequent pre- and post-hybridization treatments.

הר שלם<em&gt; באתרו</em&gt; כלת שיטה עבור חלזון הרכיכות<em&gt; Stagnalis Lymnaea</em

Whole mount in situ hybridization (WMISH) is a technique that allows for the spatial resolution of nucleic acid molecules (often mRNAs) within a ...

Filtration Isolation of Nucleic Acids:  A Simple and Rapid DNA Extraction Method

FINA, filtration isolation of nucleic acids, is a novel extraction method which utilizes vertical filtration via a separation membrane and absorbent pad to extract cellular DNA from whole blood in less than 2 min. The blood specimen is treated with detergent, mixed briefly and applied by pipet to the separation membrane. The lysate wicks into the blotting pad due to capillary action, capturing the genomic DNA on the surface of the separation membrane. The extracted DNA is retained on the membrane during a simple wash step wherein PCR inhibitors are wicked into the absorbent blotting pad. The membrane containing the entrapped DNA is then added to the PCR reaction without further purification. This simple method does not require laboratory equipment and can be easily implemented with inexpensive laboratory supplies. Here we describe a protocol for highly sensitive detection and quantitation of HIV-1 proviral DNA from 100 &#181;l whole blood as a model for early infant diagnosis of HIV that could readily be adapted to other genetic targets.

We describe here a simple and rapid paper-based DNA extraction method of HIV proviral DNA from whole blood detected by quantitative PCR. This protocol can be extended for use in detecting other genetic markers or using alternative amplification methods.

בידוד סינון של חומצות גרעין: שיטת הפקת DNA פשוטה ומהירה

FINA, filtration isolation of nucleic acids, is a novel extraction method which utilizes vertical filtration via a separation membrane and absorbent pad ...