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Functional characterization of novel loss-of-function mutations in the vasopressin type 2 receptor gene causing nephrogenic diabetes insipidus.
Nephrol Dial Transplant. 2012 Apr; 27(4):1521-8.ND

Abstract

BACKGROUND

X-linked nephrogenic diabetes insipidus (NDI) is a rare polyuric disorder caused by inactivating mutations in the arginine vasopressin receptor Type 2 (AVPR2) gene.

METHODS

NDI patients from six unrelated families were subjected to mutational analysis of the AVPR2 gene. In-depth in vitro characterization of novel AVPR2 mutants by a combination of functional and immunological techniques provided further insight into molecular mechanisms causing receptor dysfunction.

RESULTS

Mutational analysis revealed four novel (A89P, G107R, Q174R, W208X) and three recurrent (V277A, R337X, ΔR247-G250) mutations within the AVPR2 gene. One family carried the missense mutation R337X and a 12-bp deletion (ΔR247-G250), corresponding to a fragment in the third intracellular loop (ICL3), which was not genetically linked to R337X. The functionally tested missense mutations A89P, G107R and Q174R led to reduced receptor cell surface expression in transfected COS-7 cells, most probably due to misfolding and intracellular retention, and consequently to reduction or loss of agonist-mediated cyclic adenosine monophosphate formation. Deletion of R247-G250 had no effect on receptor function in vitro. Comparison with other mammalian AVPR2 orthologs showed that this part of the ICL3 is structurally not conserved and, therefore, less relevant for receptor function. In contrast, all missense mutations (A89P, G107R, Q174R, V277A) affect receptor positions that were fully preserved during mammalian evolution.

CONCLUSION

Our results provide valuable information about residues critical for AVPR2 folding, trafficking and function and proof that these mutations are responsible for causing NDI in the affected subjects.

Authors+Show Affiliations

Molecular Biochemistry, Institute of Biochemistry, Medical Faculty, University of Leipzig, Leipzig, Germany.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21917732

Citation

Böselt, Iris, et al. "Functional Characterization of Novel Loss-of-function Mutations in the Vasopressin Type 2 Receptor Gene Causing Nephrogenic Diabetes Insipidus." Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association, vol. 27, no. 4, 2012, pp. 1521-8.
Böselt I, Tramma D, Kalamitsou S, et al. Functional characterization of novel loss-of-function mutations in the vasopressin type 2 receptor gene causing nephrogenic diabetes insipidus. Nephrol Dial Transplant. 2012;27(4):1521-8.
Böselt, I., Tramma, D., Kalamitsou, S., Niemeyer, T., Nykänen, P., Gräf, K. J., Krude, H., Marenzi, K. S., Di Candia, S., Schöneberg, T., & Schulz, A. (2012). Functional characterization of novel loss-of-function mutations in the vasopressin type 2 receptor gene causing nephrogenic diabetes insipidus. Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association, 27(4), 1521-8. https://doi.org/10.1093/ndt/gfr487
Böselt I, et al. Functional Characterization of Novel Loss-of-function Mutations in the Vasopressin Type 2 Receptor Gene Causing Nephrogenic Diabetes Insipidus. Nephrol Dial Transplant. 2012;27(4):1521-8. PubMed PMID: 21917732.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Functional characterization of novel loss-of-function mutations in the vasopressin type 2 receptor gene causing nephrogenic diabetes insipidus. AU - Böselt,Iris, AU - Tramma,Despoina, AU - Kalamitsou,Serafia, AU - Niemeyer,Thomas, AU - Nykänen,Päivi, AU - Gräf,Klaus-Jürgen, AU - Krude,Heiko, AU - Marenzi,Karen Sabrina, AU - Di Candia,Stefania, AU - Schöneberg,Torsten, AU - Schulz,Angela, Y1 - 2011/09/13/ PY - 2011/9/16/entrez PY - 2011/9/16/pubmed PY - 2012/8/15/medline SP - 1521 EP - 8 JF - Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association JO - Nephrol Dial Transplant VL - 27 IS - 4 N2 - BACKGROUND: X-linked nephrogenic diabetes insipidus (NDI) is a rare polyuric disorder caused by inactivating mutations in the arginine vasopressin receptor Type 2 (AVPR2) gene. METHODS: NDI patients from six unrelated families were subjected to mutational analysis of the AVPR2 gene. In-depth in vitro characterization of novel AVPR2 mutants by a combination of functional and immunological techniques provided further insight into molecular mechanisms causing receptor dysfunction. RESULTS: Mutational analysis revealed four novel (A89P, G107R, Q174R, W208X) and three recurrent (V277A, R337X, ΔR247-G250) mutations within the AVPR2 gene. One family carried the missense mutation R337X and a 12-bp deletion (ΔR247-G250), corresponding to a fragment in the third intracellular loop (ICL3), which was not genetically linked to R337X. The functionally tested missense mutations A89P, G107R and Q174R led to reduced receptor cell surface expression in transfected COS-7 cells, most probably due to misfolding and intracellular retention, and consequently to reduction or loss of agonist-mediated cyclic adenosine monophosphate formation. Deletion of R247-G250 had no effect on receptor function in vitro. Comparison with other mammalian AVPR2 orthologs showed that this part of the ICL3 is structurally not conserved and, therefore, less relevant for receptor function. In contrast, all missense mutations (A89P, G107R, Q174R, V277A) affect receptor positions that were fully preserved during mammalian evolution. CONCLUSION: Our results provide valuable information about residues critical for AVPR2 folding, trafficking and function and proof that these mutations are responsible for causing NDI in the affected subjects. SN - 1460-2385 UR - https://www.unboundmedicine.com/medline/citation/21917732/Functional_characterization_of_novel_loss_of_function_mutations_in_the_vasopressin_type_2_receptor_gene_causing_nephrogenic_diabetes_insipidus_ L2 - https://academic.oup.com/ndt/article-lookup/doi/10.1093/ndt/gfr487 DB - PRIME DP - Unbound Medicine ER -