עבודה זו מומנה בחלקה על ידי אגף הרבייה של המכון הלאומי לבריאות הילד והתפתחות האדם (NICHD - R21 HD059015) ועל ידי ה &#39;הוד קרן פרס צ&#39;רלס יאנג הילד החוקר למחקר בריאות (בוסטון, MA).

<ol>
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E., Ma, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Kisspeptin+Directly+Stimulates+Gonadotropin-Releasing+Hormone+Release+via+G+Protein-Coupled+Receptor+54.">Kisspeptin Directly Stimulates Gonadotropin-Releasing Hormone Release via G Protein-Coupled Receptor 54.</a> Proc Natl Acad Sci U S A. 102, 1761-1766 (2005).</li><li>Teles, M. G., Bianco, S. D., Brito, V. 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C., Ellery, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Two+Novel+Missense+Mutations+in+G+Protein-Coupled+Receptor+54+in+a+Patient+with+Hypogonadotropic+Hypogonadism.">Two Novel Missense Mutations in G Protein-Coupled Receptor 54 in a Patient with Hypogonadotropic Hypogonadism.</a> J Clin Endocrinol Metab. 90, 1849-1855 (2005).</li><li>Wacker, J. L., Feller, D. B., Tang, X. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Disease-Causing+Mutation+in+GPR54+Reveals+the+Importance+of+the+Second+Intracellular+Loop+for+Class+A+G-Protein-Coupled+Receptor+Function.">Disease-Causing Mutation in GPR54 Reveals the Importance of the Second Intracellular Loop for Class A G-Protein-Coupled Receptor Function.</a> J Biol Chem. 283, 31068-31078 (2008).</li><li>Szereszewski, J. M., Pampillo, M., Ahow, M. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=GPR54+regulates+ERK1/2+activity+and+hypothalamic+gene+expression+in+a+Galpha(q/11)+and+beta-arrestin-dependent+manner.">GPR54 regulates ERK1/2 activity and hypothalamic gene expression in a Galpha(q/11) and beta-arrestin-dependent manner.</a> PLoS One. 5, e12964-e12964 (2010).</li><li>Bianco, S. D. C., Vandepas, L., Correa-Medina, M., Gereben, B., Mukherjee, A., Kuohung, W., Carroll, R., Teles, M. G., Latronico, A. C., Kaiser, U. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=KISS1R+Intracellular+Trafficking+and+Degradation:+Effect+of+the+Arg386Pro+Disease-Associated+Mutation.">KISS1R Intracellular Trafficking and Degradation: Effect of the Arg386Pro Disease-Associated Mutation.</a> Endocrinology. , (2011).</li><li>Hutchison, C. A., Phillips, S., Edgell, M. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mutagenesis+at+a+Specific+Position+in+a+DNA+Sequence.">Mutagenesis at a Specific Position in a DNA Sequence.</a> J Biol Chem. 253, 6551-6560 (1978).</li><li>Mullis, K. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Unusual+Origin+of+the+Polymerase+Chain+Reaction.">The Unusual Origin of the Polymerase Chain Reaction.</a> Sci Am. 262, 56-61 (1990).</li><li>Henke, W., Herdel, K., Jung, K., Schnorr, D., Loening, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Betaine+improves+the+PCR+amplification+of+GC-rich+DNA+sequences.">Betaine improves the PCR amplification of GC-rich DNA sequences.</a> Nucleic Acids Res. 25, 3957-3958 (1997).</li><li>Sahdev, S., Saini, S., Tiwari, P., Saxena, S., Singh Saini, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Amplification+of+GC-rich+genes+by+following+a+combination+strategy+of+primer+design,+enhancers+and+modified+PCR+cycle+conditions.">Amplification of GC-rich genes by following a combination strategy of primer design, enhancers and modified PCR cycle conditions.</a> Mol Cell Probes. 21, 303-307 (2007).</li><li>Kong, K. C., Poyner, D. R., Wheatly, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chapter+10.">Chapter 10.</a> MSTA. in G Protein-Coupled Receptors: Essential Methods. , 197-204 (2010).</li><li>Hall, R. A., George, S. R., O'Dowd, B. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chapter+9.">Chapter 9.</a> G protein-Coupled Receptor-Protein Interactions. , 170-171 (2005).</li><li>Chaturvedi, K., Bandari, P., Chinen, N., Howells, R. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Proteasome+Involvement+in+Agonist-Induced+Down-Regulation+of+Mu+and+Delta+Opioid+Receptors.">Proteasome Involvement in Agonist-Induced Down-Regulation of Mu and Delta Opioid Receptors.</a> J Biol Chem. 276, 12345-12355 (2001).</li><li>Shenoy, S. K., McDonald, P. H., Kohout, T. A., Lefkowitz, R. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regulation+of+Receptor+Fate+by+Ubiquitination+of+Activated+Beta+2-Adrenergic+Receptor+and+Beta-Arrestin.">Regulation of Receptor Fate by Ubiquitination of Activated Beta 2-Adrenergic Receptor and Beta-Arrestin.</a> Science. 294, 1307-1313 (2001).</li></ol>

אין ניגודי אינטרסים הכריז.

אתר מכוונת mutagenesis שימש ללמוד תפקוד החלבון על ידי החדרת שינויים נוקלאוטיד ברצף קידוד של גנים ממוקד עבור למעלה משלושה עשורים. הטכניקה המקורית תוארה בשנת 1978 על ידי הכימאי הבריטי הקנדי, חתן פרס נובל מייקל סמית&#39; 10. מייקל סמית חלקו את 1993 פרס נובל לכימיה עם Kary מוליס, ב...

<table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> שם מגיב </td><td> חברה </td><td> מספר קטלוגי </td></tr><tr><td> הפתרון 10x PCRx Enhancer </td><td> Invitrogen </td><td> 52391 </td></tr><tr><td> PfuUltra באיכות גבוהה פולימראז ה-DNA אלטרנטיבית דטרגנט </td><td> Stratagene </td><td> 600385 </td></tr><tr><td> DPN-I </td><td> ניו אינגלנד Biolabs </td><td> R0176 </td></tr><tr><td> XL10-Gold E. Ultracompetent coli תאים </td><td> Stratagene </td><td> 200314 </td></tr><tr><td> DMEM </td><td> Cellgro </td><td> 10-013-CV </td></tr><tr><td> בסרום שור עוברית </td><td> אטלנטה הביולוגיים </td><td> S11550 </td></tr><tr><td> Geneporter מגיב transfection </td><td> Genlantis </td><td> T201007 </td></tr><tr><td> Leupeptin </td><td> Calbiochem </td><td> 108975 </td></tr><tr><td> MG132 </td><td> Calbiochem </td><td> 47491 </td></tr><tr><td> 10xPBS </td><td> Ambion </td><td> AM9625 </td></tr><tr><td> מעכבי פרוטאז קוקטייל PMSF </td><td> סנטה קרוז ביוטכנולוגיה </td><td> SC-24948 </td></tr><tr><td> פירס Assay BCA חלבון Kit </td><td> Thermo Scientific </td><td> 23225 </td></tr><tr><td> אנטי-myc תג (שיבוט 4A6) agarose המצומד </td><td> Millipore </td><td> 16-219 </td></tr><tr><td> 2x חיץ העמסה </td><td> BioRad </td><td> 161-0737 </td></tr><tr><td> קריטריון טריס-HCl precast ג&#39;ל, שיפוע 4-15% </td><td> BioRad </td><td> 345-0028 </td></tr><tr><td> Immobilon-FL PVDF קרום </td><td> Millipore </td><td> IPFL00010 </td></tr><tr><td> אודיסיאה חסימת הצפת </td><td> LI-COR Biosciences </td><td> 927-40000 </td></tr><tr><td> 10xTBS </td><td> BioRad </td><td> 170-6435 </td></tr><tr><td> נוגדנים נגד ארנב-myc </td><td> תא האיתות </td><td> 2272 </td></tr><tr><td> נגד ארנב עיזים IRDye 800CW </td><td> LI-COR Biosciences </td><td> 926-32211 </td></tr><tr><td> הדמיה אודיסיאה אינפרא אדום מערכת </td><td> LI-COR Biosciences </td><td></td></tr><tr><td> מעכבי פרוטאז האלט קוקטייל (100x) </td><td> Thermo Scientific </td><td> 78430 </td></tr></tbody></table>

mutagenesis and analysis of genetic mutations in the gc-rich kiss1 receptor sequence identified in humans with reproductive disorders

קולטן kisspeptin (KISS1R) הוא קולטן G-חלבון בשילוב מוכר ההדק של גיל ההתבגרות וגם הרגולטור של יכולת הרבייה לבגרות 1,2,3. מוטציות ב inactivating KISS1R זיהו בחולים קושרו עם 1,2 iodiopathic hypogonadotropic (IHH) hypogonadism ואת גיל ההתבגרות מוקדמת 4. מחקרים פונקציונלי של מוטציות אלה חיוני להבנת המנגנונים הרגולציה של רבייה על ידי קולטן זה, כמו גם אלה המעצבים את תוצאות המחלה, אשר כתוצאה איתות KISS1R לתפקד נורמלי. עם זאת, רצף מאוד GC-עשיר של הגן KISS1R עושה את זה די קשה להכניס מוטציות או להגביר את הגן המקודד קולטן זה על ידי PCR. כאן אנו מתארים שיטה להציג מוטציות של עניין זה לתוך רצף מאוד GC-עשירה שימש בהצלחה לייצר מעל KISS1R עשרות מוטציות במעבדה שלנו. יש לנו אופטימיזציה התנאים PCR כדי להקל על הגברה של מגוון רחב של מוטציות KISS1R הכוללים החלפות, השמטות או הוספות ברצף KISS1R. התוספת של פתרון ה-PCR משפר, כמו גם אחוז קטן של DMSO היה מועיל במיוחד כדי לשפר את ההגברה. הליך זה מותאם עשוי להיות שימושי עבור GC-עשיר תבניות אחרות. וקטור הביטוי קידוד KISS1R הוא שימש לאפיין איתות פונקציה של קולטן זה על מנת להבין כיצד מוטציות עשויים להשתנות פונקציה KISS1R להוביל פנוטיפים הקשורים הרבייה. לפיכך, יישומים פוטנציאליים של מוטנטים KISS1R שנוצר על ידי mutagenesis באתר ביים ניתן לתיאור על ידי מחקרים רבים 1,4,5,6,7,8. כדוגמה, המוטציה להרוויח-of-פונקציה של KISS1R (Arg386Pro), אשר מזוהה עם ההתבגרות מוקדמת, הוכח כדי להאריך את התגובה של הקולטן לגירויים ליגנד 4, כמו גם לשנות את קצב הפירוק של KISS1R 9 . מעניין לציין, כי מחקרים שלנו מצביעות על כך KISS1R הוא מושפל על ידי הפרוטאזום, בניגוד לזילות lysosomal קלאסי שתואר עבור רוב החלבון מצמידים קולטני G 9. בדוגמה המוצגת כאן, השפלה של KISS1R הוא נחקר האדם תאים עובריים כליה (HEK-293) transiently להביע myc-tagged KISS1R (MycKISS1R) ומטופלים עם מעכבי פרוטאזום או ליזוזום. Lysates סלולריים הם immunoprecipitated באמצעות agarose-מצומדות אנטי-myc נוגדן ואחריו ניתוח כתם המערבי. איתור וכימות של MycKISS1R על כתמים מתבצעת באמצעות מערכת LI-COR אודיסיאה אינפרא אדום. גישה זו עשויה להיות שימושית בחקר פירוק של חלבונים אחרים בעלי עניין גם כן.

Watch this Scientific Journal Video about Mutagenesis and Analysis of Genetic Mutations in the GC-rich KISS1 Receptor Sequence Identified in Humans with Reproductive Disorders at JoVE.com

Mutagenesis and Analysis of Genetic Mutations in the GC-rich KISS1 Receptor Sequence Identified in Humans with Reproductive Disorders

מוטציות בקולטן kisspeptin (KISS1R) קשורים עם הפרעות הרבייה אצל חולים. כאן אנו מתארים כיצד להציג מוטציות עניין ברצף GC-עשיר של KISS1R כמו גם השימוש בונה KISS1R לאפיין את מסלול הפירוק של הקולטן על ידי immunoprecipitation ומערב כתם

Mutagenesis וניתוח של מוטציות גנטיות ברצף KISS1 GC-עשיר קולטן לזהות בני אדם עם הפרעות פוריות

The kisspeptin receptor (KISS1R) is a G protein-coupled receptor recognized as the trigger of puberty and a regulator of reproductive competence in ...

mutagenesis-analysis-genetic-mutations-gc-rich-kiss1-receptor

Research

JoVE Journal

Biology

13.9K Views.  University of Miami Miller School of Medicine. מוטציות בקולטן kisspeptin (KISS1R) קשורים עם הפרעות הרבייה אצל חולים. כאן אנו מתארים כיצד להציג מוטציות עניין ברצף GC-עשיר של KISS1R כמו גם השימוש בונה KISS1R לאפיין את מסלול הפירוק של הקולטן על ידי immunoprecipitation ומערב כתם

Video: Mutagenesis and Analysis of Genetic Mutations in the GC-rich KISS1 Receptor Sequence Identified in Humans with Reproductive Disorders

Assay for Neural Induction in the Chick Embryo

The chick embryo is a valuable tool in the study of early embryonic development. Its transparency, accessibility and ease of manipulation, make it an ideal tool for studying the formation and initial patterning of the nervous system. This video demonstrates how to graft organizer tissue into a host, a method by which Hensen s node (the organizer in the chick embryo) is grafted to a host competent ectoderm. The organizer graft instructs overlying na ve tissue to adopt a neural fate via neural inducing signals. This mechanism is referred to as neural induction, and constitutes the initial step in the formation of brain and spinal cord in amniotes. This method is essentially used for the characterization of putative neural inducing molecules in chick. This video demonstrates the different steps in the assay for neural induction; First, the donnor embryo is explanted and pinned on a dish. Then, the host embryo is prepared for New culture. The graft is excised and transplanted to the host area pellucida margin. The host is cultured for 18-22 hrs. The assembly is fixed and processed for further applications (e.g. in situ hybridization). This method was originally devised by Waddington 1,2 and Gallera 3,4.

Neural induction is the first step in the formation of the brain. It is a mechanism by which Hensen's node (organizer), instructs adjacent tissue to adopt a neural fate, i.e. to give rise to the nervous system. This video demonstrates an assay for neural induction in chick embryo.

Assay עבור אינדוקציה עצבית בעובר צ&#39;יק

The chick embryo is a valuable tool in the study of early embryonic development. Its transparency, accessibility and ease of manipulation, make it an ...

Primary Culture and Plasmid Electroporation of the Murine Organ of Corti. 

In all mammals, the sensory epithelium for audition is located along the spiraling organ of Corti that resides within the conch shaped cochlea of the inner ear (fig 1). Hair cells in the developing cochlea, which are the mechanosensory cells of the auditory system, are aligned in one row of inner hair cells and three (in the base and mid-turns) to four (in the apical turn) rows of outer hair cells that span the length of the organ of Corti. Hair cells transduce sound-induced mechanical vibrations of the basilar membrane into neural impulses that the brain can interpret. Most cases of sensorineural hearing loss are caused by death or dysfunction of cochlear hair cells.
An increasingly essential tool in auditory research is the isolation and in vitro culture of the organ explant 1,2,9. Once isolated, the explants may be utilized in several ways to provide information regarding normative, anomalous, or therapeutic physiology. Gene expression, stereocilia motility, cell and molecular biology, as well as biological approaches for hair cell regeneration are examples of experimental applications of organ of Corti explants.
This protocol describes a method for the isolation and culture of the organ of Corti from neonatal mice. The accompanying video includes stepwise directions for the isolation of the temporal bone from mouse pups, and subsequent isolation of the cochlea, spiral ligament, and organ of Corti. Once isolated, the sensory epithelium can be plated and cultured in vitro in its entirety, or as a further dissected micro-isolate that lacks the spiral limbus and spiral ganglion neurons. Using this method, primary explants can be maintained for 7-10 days. As an example of the utility of this procedure, organ of Corti explants will be electroporated with an exogenous DsRed reporter gene. This method provides an improvement over other published methods because it provides reproducible, unambiguous, and stepwise directions for the isolation, microdissection, and primary culture of the organ of Corti.

Primary Culture and Plasmid Electroporation of the Murine Organ of Corti.

This procedure describes a method for the isolation and culture of the murine organ of Corti with or without the spiral limbus and spiral ganglion neurons. We also demonstrate a method for the expression of an exogenous reporter gene in the organ of Corti explant by electroporation.

תרבות ראשיים electroporation פלסמיד של האיבר Murine של קורטי.

In all mammals, the sensory epithelium for audition is located along the spiraling organ of Corti that resides within the conch shaped cochlea of the ...

Mutagenesis and Functional Analysis of Ion Channels Heterologously Expressed in Mammalian Cells

We will demonstrate how to study the functional effects of introducing a point mutation in an ion channel. We study G protein-gated inwardly rectifying potassium (referred to as GIRK) channels, which are important for regulating the excitability of neurons. There are four different mammalian GIRK channel subunits (GIRK1-GIRK4) - we focus on GIRK2 because it forms a homotetramer. Stimulation of different types of G protein-coupled receptors (GPCRs), such as the muscarinic receptor (M2R), leads to activation of GIRK channels. Alcohol also directly activates GIRK channels. We will show how to mutate one amino acid by specifically changing one or more nucleotides in the cDNA for the GIRK channel. This mutated cDNA sequence will be amplified in bacteria, purified, and the presence of the point mutation will be confirmed by DNA sequencing. The cDNAs for the mutated and wild-type GIRK channels will be transfected into human embryonic kidney HEK293T cells cultured in vitro. Lastly, whole-cell patch-clamp electrophysiology will be used to study the macroscopic potassium currents through the ectopically expressed wild-type or mutated GIRK channels. In this experiment, we will examine the effect of a L257W mutation in GIRK2 channels on M2R-dependent and alcohol-dependent activation.

We will demonstrate how to study the effect of a single point mutation on the function of an ion channel.

Mutagenesis וניתוח פונקציונלי של תעלות יונים הביעו Heterologously בתאי יונקים

We will demonstrate how to study the functional effects of introducing a point mutation in an ion channel. We study G protein-gated inwardly rectifying ...

Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides

Extensive research has provided ample evidences suggesting that protein folding in the cell is a co-translational process1-5. However, the exact pathway that polypeptide chain follows during co-translational folding to achieve its functional form is still an enigma. In order to understand this process and to determine the exact conformation of the co-translational folding intermediates, it is essential to develop techniques that allow the isolation of RNCs carrying nascent chains of predetermined sizes to allow their further structural analysis.
SecM (secretion monitor) is a 170 amino acid E. coli protein that regulates expression of the downstream SecA (secretion driving) ATPase in the secM-secA operon6. Nakatogawa and Ito originally found that a 17 amino acid long sequence (150-FSTPVWISQAQGIRAGP-166) in the C-terminal region of the SecM protein is sufficient and necessary to cause stalling of SecM elongation at Gly165, thereby producing peptidyl-glycyl-tRNA stably bound to the ribosomal P-site7-9. More importantly, it was found that this 17 amino acid long sequence can be fused to the C-terminus of virtually any full-length and/or truncated protein thus allowing the production of RNCs carrying nascent chains of predetermined sizes7. Thus, when fused or inserted into the target protein, SecM stalling sequence produces arrest of the polypeptide chain elongation and generates stable RNCs both in vivo in E. coli cells and in vitro in a cell-free system. Sucrose gradient centrifugation is further utilized to isolate RNCs.
The isolated RNCs can be used to analyze structural and functional features of the co-translational folding intermediates. Recently, this technique has been successfully used to gain insights into the structure of several ribosome bound nascent chains10,11. Here we describe the isolation of bovine Gamma-B Crystallin RNCs fused to SecM and generated in an in vitro translation system.

We describe here a technique that is now routinely used to isolate stably bound ribosome nascent chain complexes (RNCs). This technique takes advantage of the discovery that a 17 amino acid long SecM "arrest sequence" can halt translation elongation in a prokaryotic (E. coli) system, when inserted into (or fused to the C-terminus) of virtually any protein.

באמצעות רצף מעצר SecM ככלי לבודד פוליפפטידים כרוכים הריבוזום

Extensive research has provided ample evidences suggesting that protein folding in the cell is a co-translational process1-5. However, the exact pathway ...

Rapid Genetic Analysis of Epithelial-Mesenchymal Signaling During Hair Regeneration

Hair follicle morphogenesis, a complex process requiring interaction between epithelia-derived keratinocytes and the underlying mesenchyme, is an attractive model system to study organ development and tissue-specific signaling. Although hair follicle development is genetically tractable, fast and reproducible analysis of factors essential for this process remains a challenge. Here we describe a procedure to generate targeted overexpression or shRNA-mediated knockdown of factors using lentivirus in a tissue-specific manner. Using a modified version of a hair regeneration model 5, 6, 11, we can achieve robust gain- or loss-of-function analysis in primary mouse keratinocytes or dermal cells to facilitate study of epithelial-mesenchymal signaling pathways that lead to hair follicle morphogenesis. We describe how to isolate fresh primary mouse keratinocytes and dermal cells, which contain dermal papilla cells and their precursors, deliver lentivirus containing either shRNA or cDNA to one of the cell populations, and combine the cells to generate fully formed hair follicles on the backs of nude mice. This approach allows analysis of tissue-specific factors required to generate hair follicles within three weeks and provides a fast and convenient companion to existing genetic models.

Tissue-specific analysis of a hair follicle regeneration model using lentivirus to mediate gain- or loss-of-function.

ניתוח גנטי מהיר של איתות אפיתל-mesenchymal במהלך התחדשות שיער

Hair follicle morphogenesis, a complex process requiring interaction between epithelia-derived keratinocytes and the underlying mesenchyme, is an ...

Alternative Cultures for Human Pluripotent Stem Cell Production, Maintenance, and Genetic Analysis

Human pluripotent stem cells (hPSCs) hold great promise for regenerative medicine and biopharmaceutical applications. Currently, optimal culture and efficient expansion of large amounts of clinical-grade hPSCs are critical issues in hPSC-based therapies. Conventionally, hPSCs are propagated as colonies on both feeder and feeder-free culture systems. However, these methods have several major limitations, including low cell yields and generation of heterogeneously differentiated cells. To improve current hPSC culture methods, we have recently developed a new method, which is based on non-colony type monolayer (NCM) culture of dissociated single cells. Here, we present detailed NCM protocols based on the Rho-associated kinase (ROCK) inhibitor Y-27632. We also provide new information regarding NCM culture with different small molecules such as Y-39983 (ROCK I inhibitor), phenylbenzodioxane (ROCK II inhibitor), and thiazovivin (a novel ROCK inhibitor). We further extend our basic protocol to cultivate hPSCs on defined extracellular proteins such as the laminin isoform 521 (LN-521) without the use of ROCK inhibitors. Moreover, based on NCM, we have demonstrated efficient transfection or transduction of plasmid DNAs, lentiviral particles, and oligonucleotide-based microRNAs into hPSCs in order to genetically modify these cells for molecular analyses and drug discovery. The NCM-based methods overcome the major shortcomings of colony-type culture, and thus may be suitable for producing large amounts of homogeneous hPSCs for future clinical therapies, stem cell research, and drug discovery.

Here, we present human pluripotent stem cell (hPSC) culture protocols, based on non-colony type monolayer (NCM) growth of dissociated single cells. This new method, utilizing Rho-associated kinase inhibitors or the laminin isoform 521 (LN-521), is suitable for producing large amounts of homogeneous hPSCs, genetic manipulation, and drug discovery.

תרבויות אלטרנטיבי לפלוריפוטנטיים אנושיים לתאים גזע ייצור, תחזוקה וניתוח גנטי

Human pluripotent stem cells (hPSCs) hold great promise for regenerative medicine and biopharmaceutical applications. Currently, optimal culture and ...

High-resolution Time-lapse Imaging and Automated Analysis of Microtubule Dynamics in Living Human Umbilical Vein Endothelial Cells

The physiological process by which new vasculature forms from existing vasculature requires specific signaling events that trigger morphological changes within individual endothelial cells (ECs). These processes are critical for homeostatic maintenance such as wound healing, and are also crucial in promoting tumor growth and metastasis. EC morphology is defined by the organization of the cytoskeleton, a tightly regulated system of actin and microtubule (MT) dynamics that is known to control EC branching, polarity and directional migration, essential components of angiogenesis. To study MT dynamics, we used high-resolution fluorescence microscopy coupled with computational image analysis of fluorescently-labeled MT plus-ends to investigate MT growth dynamics and the regulation of EC branching morphology and directional migration. Time-lapse imaging of living Human Umbilical Vein Endothelial Cells (HUVECs) was performed following transfection with fluorescently-labeled MT End Binding protein 3 (EB3) and Mitotic Centromere Associated Kinesin (MCAK)-specific cDNA constructs to evaluate effects on MT dynamics. PlusTipTracker software was used to track EB3-labeled MT plus ends in order to measure MT growth speeds and MT growth lifetimes in time-lapse images. This methodology allows for the study of MT dynamics and the identification of how localized regulation of MT dynamics within sub-cellular regions contributes to the angiogenic processes of EC branching and migration.

Protocols for Human Umbilical Vein Endothelial Cell (HUVEC) culture, transient transfection of fluorescently-labeled markers of microtubule growth, live-cell imaging and automated analysis of interphase microtubule growth dynamics are detailed.

זמן לשגות הדמיה ברזולוציה גבוהה וניתוח אוטומטי של Dynamics microtubule In Living האדם טבורי וריד לתאי אנדותל

The physiological process by which new vasculature forms from existing vasculature requires specific signaling events that trigger morphological changes ...

Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study

Oligomerization is often a structural requirement for proteins to accomplish their specific cellular function. For instance, tetramerization of the ryanodine receptor (RyR) is necessary for the formation of a functional Ca2+ release channel pore. Here, we describe detailed protocols for the assessment of protein self-association, including yeast two-hybrid (Y2H), co-immunoprecipitation (co-IP) and chemical cross-linking assays. In the Y2H system, protein self-interaction is detected by &#946;-galactosidase assay in yeast co-expressing GAL4 bait and target fusions of the test protein. Protein self-interaction is further assessed by co-IP using HA- and cMyc-tagged fusions of the test protein co-expressed in mammalian HEK293 cells. The precise stoichiometry of the protein homo-oligomer is examined by cross-linking and SDS-PAGE analysis following expression in HEK293 cells. Using these different but complementary techniques, we have consistently observed the self-association of the RyR N-terminal domain and demonstrated its intrinsic ability to form tetramers. These methods can be applied to protein-protein interaction and homo-oligomerization studies of other mammalian integral membrane proteins.

Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study

Oligomerization of the ryanodine receptor, a homo-tetrameric ion channel mediating Ca2+ release from intracellular stores, is critical for skeletal and cardiac muscle contraction. Here, we present complementary in vivo and in vitro methods to detect protein self-association and determine homo-oligomer stoichiometry.

גישות גנטיות ביוכימיים עבור<em&gt; In vivo</em&gt; ו<em&gt; במבחנה</em&gt; הערכת oligomerization חלבון: מקרה המבחן קולטן Ryanodine

Oligomerization is often a structural requirement for proteins to accomplish their specific cellular function. For instance, tetramerization of the ...

Open-source Single-particle Analysis for Super-resolution Microscopy with VirusMapper

Super-resolution fluorescence microscopy is currently revolutionizing cell biology research. Its capacity to break the resolution limit of around 300 nm allows for the routine imaging of nanoscale biological complexes and processes. This increase in resolution also means that methods popular in electron microscopy, such as single-particle analysis, can readily be applied to super-resolution fluorescence microscopy. By combining this analytical approach with super-resolution optical imaging, it becomes possible to take advantage of the molecule-specific labeling capacity of fluorescence microscopy to generate structural maps of molecular elements within a metastable structure. To this end, we have developed a novel algorithm &#8212; VirusMapper &#8212; packaged as an easy-to-use, high-performance, and high-throughput ImageJ plugin. This article presents an in-depth guide to this software, showcasing its ability to uncover novel structural features in biological molecular complexes. Here, we present how to assemble compatible data and provide a step-by-step protocol on how to use this algorithm to apply single-particle analysis to super-resolution images.

This manuscript uses the Fiji-based open-source software package VirusMapper to apply single-particle analysis to super-resolution microscopy images in order to generate precise models of nanoscale structure.

ניתוח קוד פתוח Single-חלקיק למיקרוסקופיה סופר-רזולוציה עם VirusMapper

Super-resolution fluorescence microscopy is currently revolutionizing cell biology research. Its capacity to break the resolution limit of around 300 nm ...

Visualizing Genetic Variants, Short Targets, and Point Mutations in the Morphological Tissue Context with an RNA In Situ Hybridization Assay

Because precision medicine is highly dependent on the accurate detection of biomarkers, there is an increasing need for standardized and robust technologies that measure RNA biomarkers in situ in clinical specimens. While grind-and-bind assays like RNAseq and quantitative RT-PCR enable highly sensitive gene expression measurements, they also require RNA extraction and thus prevent valuable expression analysis within the morphological tissue context. The in situ hybridization (ISH) assay described here can detect RNA target sequences as short as 50 nucleotides at single-nucleotide resolution and at the single-cell level. This assay is complementary to the previously developed commercial assay and enables sensitive and specific in situ detection of splice variants, short targets, and point mutations within the tissue. In this protocol, probes were designed to target unique exon junctions for two clinically important splice variants, EGFRvIII and MET&#916;14. The detection of short target sequences was demonstrated by the specific detection of CDR3 sequences of T-cell receptors &#945; and &#946; in the Jurkat T-cell line. Also shown is the utility of this ISH assay for the distinction of RNA target sequences at single-nucleotide resolution (point mutations) through the visualization of EGFR L858R and KRAS G12A single-nucleotide variations in cell lines using automated staining platforms. In summary, the protocol shows a specialized RNA ISH assay that enables the detection of splice variants, short sequences, and mutations in situ for manual performance and on automated stainers.

Visualizing Genetic Variants, Short Targets, and Point Mutations in the Morphological Tissue Context with an RNA In Situ Hybridization Assay

Here, we describe an in situ hybridization assay which enables sensitive and specific detection of sequences as short as 50 nucleotides with single-nucleotide resolution at the single-cell level. The assay, which can be performed manually or automatically, can enable visualization of splice variants, short sequences, and mutations within the tissue context.