وقد تم تمويل هذا العمل جزئيا من قبل فرع الإنجابية من المعهد الوطني لصحة الطفل والتنمية البشرية (معاهد الصحة القومية -- R21 HD059015) والتي H. تشارلز هود الطفل مؤسسة جائزة الباحث الشاب بحوث الصحية (بوسطن ، ماساتشوستس).

<ol>
	<li>Seminara, S. B., Messager, S., Chatzidaki, E. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+GPR54+Gene+as+a+Regulator+of+Puberty.">The GPR54 Gene as a Regulator of Puberty.</a> N Engl J Med. 349, 1614-1627 (2003).</li><li>de Roux, N., Genin, E., Carel, J. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hypogonadotropic+Hypogonadism+Due+to+Loss+of+Function+of+the+KiSS1-Derived+Peptide+Receptor+GPR54.">Hypogonadotropic Hypogonadism Due to Loss of Function of the KiSS1-Derived Peptide Receptor GPR54.</a> Proc Natl Acad Sci U S A. 100, 10972-10976 (2003).</li><li>Messager, S., Chatzidaki, E. 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. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+GPR54-Activating+Mutation+in+a+Patient+with+Central+Precocious+Puberty.">A GPR54-Activating Mutation in a Patient with Central Precocious Puberty.</a> N Engl J Med. 358, 709-715 (2008).</li><li>Tenenbaum-Rakover, Y., Commenges-Ducos, M., Iovane, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neuroendocrine+Phenotype+Analysis+in+Five+Patients+with+Isolated+Hypogonadotropic+Hypogonadism+due+to+a+L102P+Inactivating+Mutation+of+GPR54.">Neuroendocrine Phenotype Analysis in Five Patients with Isolated Hypogonadotropic Hypogonadism due to a L102P Inactivating Mutation of GPR54.</a> J Clin Endocrinol Metab. 92, 1137-1144 (2007).</li><li>Semple, R. K., Achermann, J. 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>

الإعلان عن أي تضارب في المصالح.

وقد استخدمت موقع الطفرات الموجهة لدراسة وظيفة البروتين من خلال إدخال تغييرات في تسلسل النوكليوتيدات ترميز الجينات المستهدفة على مدى ثلاثة عقود. وقد وصفت هذه التقنية الأصلي في عام 1978 من قبل الصيدلي البريطاني والكندي الحائز على جائزة نوبل مايكل سميث 10. المشتركة...

<table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> اسم كاشف </td><td> شركة </td><td> فهرس العدد </td></tr><tr><td> 10X الحل PCRx محسن </td><td> Invitrogen </td><td> 52391 </td></tr><tr><td> PfuUltra البلمرة DNA عالية الدقة البديلة منظفات </td><td> Stratagene </td><td> 600385 </td></tr><tr><td> DPN - I </td><td> نيو إنجلاند Biolabs </td><td> R0176 </td></tr><tr><td> XL10 الذهب E. Ultracompetent الخلايا القولونية </td><td> Stratagene </td><td> 200314 </td></tr><tr><td> DMEM </td><td> Cellgro </td><td> 10-013 - CV </td></tr><tr><td> مصل بقري جنيني </td><td> اتلانتا البيولوجية </td><td> S11550 </td></tr><tr><td> Geneporter ترنسفكأيشن الكاشف </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> مثبط البروتياز الكوكتيل وPMSF </td><td> سانتا كروز التكنولوجيا الحيوية </td><td> SC - 24948 </td></tr><tr><td> بيرس الفحص البروتين BCA كيت </td><td> الحرارية العلمية </td><td> 23225 </td></tr><tr><td> مكافحة Myc العلامة (استنساخ 4A6) agarose المتقارن </td><td> ميليبور </td><td> 16-219 </td></tr><tr><td> 2X تحميل العازلة </td><td> BioRad </td><td> 161-0737 </td></tr><tr><td> معيار تريس ، حمض الهيدروكلوريك الجاهزة هلام ، والانحدار 4-15 ٪ </td><td> BioRad </td><td> 345-0028 </td></tr><tr><td> Immobilon - FL PVDF الغشاء </td><td> ميليبور </td><td> IPFL00010 </td></tr><tr><td> حظر مؤقت أوديسي </td><td> LI - COR العلوم البيولوجية </td><td> 927-40000 </td></tr><tr><td> 10xTBS </td><td> BioRad </td><td> 170-6435 </td></tr><tr><td> أرنب المضادة للأجسام المضادة myc </td><td> إشارات الخلية </td><td> 2272 </td></tr><tr><td> الماعز المضادة للأرنب IRDye 800CW </td><td> LI - COR العلوم البيولوجية </td><td> 926-32211 </td></tr><tr><td> نظام التصوير بالأشعة تحت الحمراء أوديسي </td><td> LI - COR العلوم البيولوجية </td><td></td></tr><tr><td> كوكتيل وقف المانع البروتياز (100X) </td><td> الحرارية العلمية </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

مستقبلات kisspeptin (KISS1R) هو مجموعة مستقبلات البروتين يقترن المعترف بها على الزناد من البلوغ ومنظم من الكفاءة التناسلية في مرحلة البلوغ 1،2،3. وقد ارتبطت طفرات في تعطيل KISS1R المحددة في المرضى الذين يعانون من ناقص موجهة الغدد التناسلية iodiopathic 1،2 (IHH) قصور الغدد التناسلية والبلوغ المبكر 4. الدراسات الفنية لهذه المسوخ حاسمة الأهمية بالنسبة لفهمنا للآليات الكامنة وراء تنظيم هذا الاستنساخ بواسطة مستقبلات فضلا عن تشكيل لنتائج المرض الذي ينجم عن إشارات KISS1R غير طبيعي وظيفة. ومع ذلك ، فإن تسلسل للغاية GC - الغنية من الجين KISS1R يجعل من الصعب أن أعرض بدلا الطفرات أو تضخيم هذا الجين الترميز بواسطة مستقبلات PCR. نحن هنا تصف طريقة لإدخال طفرات من الفائدة في هذا التسلسل للغاية GC - الغنية التي استخدمت بنجاح لتوليد أكثر من المسوخ KISS1R عشرة في المختبر لدينا. ونحن الأمثل لتسهيل ظروف PCR التضخيم من مجموعة من المسوخ التي تشمل استبدال KISS1R ، والحذف أو الإدراج في التسلسل KISS1R. إضافة إلى حل محسن PCR ، فضلا عن نسبة مئوية صغيرة من DMSO كانت مفيدة بشكل خاص لتحسين التضخيم. قد يكون هذا الإجراء مفيدا الأمثل لقوالب GC - الغنية الأخرى كذلك. واستخدمت ناقلات ترميز KISS1R التعبير لوصف الإشارات وظيفة هذا المستقبل من أجل أن نفهم كيف يمكن أن تغير KISS1R الطفرات وظيفة ، وتؤدي إلى الظواهر المرتبطة التناسلي. تبعا لذلك ، يمكن أن يتضح من التطبيقات المحتملة الناتجة عن المسوخ KISS1R الطفرات في الموقع من إخراج العديد من الدراسات 1،4،5،6،7،8. كمثال على ذلك ، وقد تبين الطفرة كسب من بين وظيفة في KISS1R (Arg386Pro) ، الذي يرتبط مع سن البلوغ المبكر ، إلى إطالة أمد استجابة لتحفيز مستقبلات يجند 4 وكذلك لتغيير معدل تدهور KISS1R 9 . ومن المثير للاهتمام ، والدراسات لدينا تشير إلى أن KISS1R هو المتدهورة التي proteasome ، في مقابل تدهور في الليزوزومية الكلاسيكية وصفها لمعظم مستقبلات البروتين يقترن G 9. في المثال المعروض هنا ، هو التحقيق تدهور KISS1R في خلايا الكلى البشرية الجنينية (كلوة الجنين البشري - 293) معربا عن عابر Myc الموسومة KISS1R (MycKISS1R) وتعامل مع مثبطات proteasome أو يحلول. وimmunoprecipitated lysates الخلية باستخدام agarose - مترافق المضادة للأجسام المضادة myc يليه تحليل لطخة غربية. يتم إجراء الكشف النوعي والكمي لMycKISS1R على البقع باستخدام نظام أوديسي LI - COR الأشعة تحت الحمراء. قد يكون هذا النهج مفيدا في دراسة تدهور البروتينات الأخرى ذات الاهتمام كذلك.

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

ترتبط طفرات في مستقبلات kisspeptin (KISS1R) يعانون من اضطرابات الإنجابية في المرضى. نحن هنا تصف كيفية إدخال طفرات مهمة في تسلسل القيادة العامة الغنية KISS1R فضلا عن استخدام بنيات KISS1R لتوصيف مسار تدهور بواسطة مستقبلات مناعي وصمة عار الغربية.

الطفرات وتحليل الطفرات الوراثية في تسلسل القيادة العامة الغنية مستقبلات KISS1 المحددة في البشر يعانون من اضطرابات الإنجابية

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. ترتبط طفرات في مستقبلات kisspeptin (KISS1R) يعانون من اضطرابات الإنجابية في المرضى. نحن هنا تصف كيفية إدخال طفرات مهمة في تسلسل القيادة العامة الغنية KISS1R فضلا عن استخدام بنيات KISS1R لتوصيف مسار تدهور بواسطة مستقبلات مناعي وصمة عار الغربية.

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.

مقايسة لتحريض العصبية في الأجنة الفرخ

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.

الابتدائية الثقافة وElectroporation البلازميد الجهاز الفئران كورتي.

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.

الطفرات والتحليل الوظيفي للقنوات ايون أعربت Heterologously في خلايا الثدييات

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.

باستخدام SecM تسلسل توقيف كأداة لعزل البروتينية منضم ريبوسوم

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.

تحليل سريع لالوراثية طلائي-الوسيطة اشارة خلال تجديد الشعر

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.

الثقافات البديلة لافرة القوة البشرية الجذعية إنتاج الخلية، الصيانة، والتحليل الوراثي

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.

عالية الدقة التصوير الوقت الفاصل بين وتحليل الآلي للأنيبيب حيوية في المعيشة السري الإنسان خلايا الوريد غشائي

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.

النهج الوراثية والبيوكيميائية ل<em&gt; في فيفو</em&gt; و<em&gt; في المختبر</em&gt; تقييم Oligomerization البروتين: دراسة حالة Ryanodine مستقبلات

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.

المصدر المفتوح تحليل واحد الجسيمات لسوبر قرار المجهري مع 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.