Mutagenesis और जीसी अमीर KISS1 रिसेप्टर प्रजनन विकार के साथ मनुष्य में पहचाने गए अनुक्रम में आनुवंशिक परिवर्तन के विश्लेषण
Summary
Kisspeptin रिसेप्टर (KISS1R) में उत्परिवर्तनों रोगियों में प्रजनन विकारों के साथ जुड़े रहे हैं. यहाँ हम का वर्णन कैसे KISS1R के जीसी अमीर अनुक्रम में के रूप में अच्छी तरह से KISS1R constructs का उपयोग immunoprecipitation और पश्चिमी धब्बा द्वारा रिसेप्टर की गिरावट मार्ग विशेषताएँ के रूप में ब्याज की म्यूटेशनों शुरू करने के लिए.
Abstract
The kisspeptin receptor (KISS1R) is a G protein-coupled receptor recognized as the trigger of puberty and a regulator of reproductive competence in adulthood 1,2,3. Inactivating mutations in KISS1R identified in patients have been associated with iodiopathic hypogonadotropic hypogonadism (IHH) 1,2 and precocious puberty 4. Functional studies of these mutants are crucial for our understanding of the mechanisms underlying the regulation of reproduction by this receptor as well as those shaping the disease outcomes, which result from abnormal KISS1R signaling and function. However, the highly GC-rich sequence of the KISS1R gene makes it rather difficult to introduce mutations or amplify the gene encoding this receptor by PCR.
Here we describe a method to introduce mutations of interest into this highly GC-rich sequence that has been used successfully to generate over a dozen KISS1R mutants in our laboratory. We have optimized the PCR conditions to facilitate the amplification of a range of KISS1R mutants that include substitutions, deletions or insertions in the KISS1R sequence. The addition of a PCR enhancer solution, as well as of a small percentage of DMSO were especially helpful to improve amplification. This optimized procedure may be useful for other GC-rich templates as well.
The expression vector encoding the KISS1R is been used to characterize signaling and function of this receptor in order to understand how mutations may change KISS1R function and lead to the associated reproductive phenotypes. Accordingly, potential applications of KISS1R mutants generated by site-directed mutagenesis can be illustrated by many studies 1,4,5,6,7,8. As an example, the gain-of-function mutation in the KISS1R (Arg386Pro), which is associated with precocious puberty, has been shown to prolong responsiveness of the receptor to ligand stimulation 4 as well as to alter the rate of degradation of KISS1R 9. Interestingly, our studies indicate that KISS1R is degraded by the proteasome, as opposed to the classic lysosomal degradation described for most G protein-coupled receptors 9. In the example presented here, degradation of the KISS1R is investigated in Human Embryonic Kidney Cells (HEK-293) transiently expressing Myc-tagged KISS1R (MycKISS1R) and treated with proteasome or lysosome inhibitors. Cell lysates are immunoprecipitated using an agarose-conjugated anti-myc antibody followed by western blot analysis. Detection and quantification of MycKISS1R on blots is performed using the LI-COR Odyssey Infrared System. This approach may be useful in the study of the degradation of other proteins of interest as well.
Protocol
Discussion
साइट – निर्देशित mutagenesis पर तीन दशकों के लिए nucleotide परिवर्तन लक्षित जीन की कोडन अनुक्रम में शुरू करने से प्रोटीन समारोह का अध्ययन करने के लिए इस्तेमाल किया गया है. मूल तकनीक 1978 में ब्रिटिश कनाडा रसायनज्ञ और नो…
Disclosures
The authors have nothing to disclose.
Acknowledgements
चार्ल्स एच. हूड फाउंडेशन युवा अन्वेषक बाल स्वास्थ्य अनुसंधान पुरस्कार (बोस्टन, MA) – इस काम आंशिक रूप से नेशनल इंस्टीट्यूट ऑफ बाल स्वास्थ्य और मानव विकास (HD059015 R21 NICHD) के प्रजनन शाखा द्वारा वित्त पोषित किया गया था.
Materials
| Name of the reagent | Company | Catalogue number |
| 10x PCRx Enhancer Solution | Invitrogen | 52391 |
| PfuUltra High-fidelity DNA Polymerase Alternative Detergent | Stratagene | 600385 |
| Dpn-I | New England Biolabs | R0176 |
| XL10-Gold Ultracompetent E. coli cells | Stratagene | 200314 |
| DMEM | Cellgro | 10-013-CV |
| Fetal bovine serum | Atlanta Biologicals | S11550 |
| Geneporter Transfection Reagent | Genlantis | T201007 |
| Leupeptin | Calbiochem | 108975 |
| MG132 | Calbiochem | 47491 |
| 10xPBS | Ambion | AM9625 |
| Protease inhibitor cocktail and PMSF | Santa Cruz Biotechnology | Sc-24948 |
| Pierce BCA Protein Assay Kit | Thermo Scientific | 23225 |
| anti-Myc tag (clone 4A6) agarose conjugate | Millipore | 16-219 |
| 2x loading buffer | BioRad | 161-0737 |
| Criterion Tris-HCl precast gel, 4-15% gradient | BioRad | 345-0028 |
| Immobilon-FL PVDF membrane | Millipore | IPFL00010 |
| Odyssey Blocking Buffer | LI-COR Biosciences | 927-40000 |
| 10xTBS | BioRad | 170-6435 |
| Rabbit anti-myc antibody | Cell signaling | 2272 |
| Goat anti-rabbit IRDye 800CW | LI-COR Biosciences | 926-32211 |
| Odyssey Imaging Infrared System | LI-COR Biosciences | |
| Halt Protease Inhibitor Cocktail (100x) | Thermo Scientific | 78430 |
References
- Seminara, S. B., Messager, S., Chatzidaki, E. E. The GPR54 Gene as a Regulator of Puberty. N Engl J Med. 349, 1614-1627 (2003).
- de Roux, N., Genin, E., Carel, J. C. Hypogonadotropic Hypogonadism Due to Loss of Function of the KiSS1-Derived Peptide Receptor GPR54. Proc Natl Acad Sci U S A. 100, 10972-10976 (2003).
- Messager, S., Chatzidaki, E. E., Ma, D. Kisspeptin Directly Stimulates Gonadotropin-Releasing Hormone Release via G Protein-Coupled Receptor 54. Proc Natl Acad Sci U S A. 102, 1761-1766 (2005).
- Teles, M. G., Bianco, S. D., Brito, V. N. A GPR54-Activating Mutation in a Patient with Central Precocious Puberty. N Engl J Med. 358, 709-715 (2008).
- Tenenbaum-Rakover, Y., Commenges-Ducos, M., Iovane, A. Neuroendocrine Phenotype Analysis in Five Patients with Isolated Hypogonadotropic Hypogonadism due to a L102P Inactivating Mutation of GPR54. J Clin Endocrinol Metab. 92, 1137-1144 (2007).
- Semple, R. K., Achermann, J. C., Ellery, J. Two Novel Missense Mutations in G Protein-Coupled Receptor 54 in a Patient with Hypogonadotropic Hypogonadism. J Clin Endocrinol Metab. 90, 1849-1855 (2005).
- Wacker, J. L., Feller, D. B., Tang, X. B. Disease-Causing Mutation in GPR54 Reveals the Importance of the Second Intracellular Loop for Class A G-Protein-Coupled Receptor Function. J Biol Chem. 283, 31068-31078 (2008).
- Szereszewski, J. M., Pampillo, M., Ahow, M. R. GPR54 regulates ERK1/2 activity and hypothalamic gene expression in a Galpha(q/11) and beta-arrestin-dependent manner. PLoS One. 5, e12964-e12964 (2010).
- 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. KISS1R Intracellular Trafficking and Degradation: Effect of the Arg386Pro Disease-Associated Mutation. Endocrinology. , (2011).
- Hutchison, C. A., Phillips, S., Edgell, M. H. Mutagenesis at a Specific Position in a DNA Sequence. J Biol Chem. 253, 6551-6560 (1978).
- Mullis, K. B. The Unusual Origin of the Polymerase Chain Reaction. Sci Am. 262, 56-61 (1990).
- Henke, W., Herdel, K., Jung, K., Schnorr, D., Loening, S. A. Betaine improves the PCR amplification of GC-rich DNA sequences. Nucleic Acids Res. 25, 3957-3958 (1997).
- Sahdev, S., Saini, S., Tiwari, P., Saxena, S., Singh Saini, K. Amplification of GC-rich genes by following a combination strategy of primer design, enhancers and modified PCR cycle conditions. Mol Cell Probes. 21, 303-307 (2007).
- Kong, K. C., Poyner, D. R., Wheatly, M. Chapter 10. MSTA. in G Protein-Coupled Receptors: Essential Methods. , 197-204 (2010).
- Hall, R. A., George, S. R., O’Dowd, B. F. Chapter 9. G protein-Coupled Receptor-Protein Interactions. , 170-171 (2005).
- Chaturvedi, K., Bandari, P., Chinen, N., Howells, R. D. Proteasome Involvement in Agonist-Induced Down-Regulation of Mu and Delta Opioid Receptors. J Biol Chem. 276, 12345-12355 (2001).
- Shenoy, S. K., McDonald, P. H., Kohout, T. A., Lefkowitz, R. J. Regulation of Receptor Fate by Ubiquitination of Activated Beta 2-Adrenergic Receptor and Beta-Arrestin. Science. 294, 1307-1313 (2001).
