Molecular and functional characterization of CBAVD-causing mutations located in CFTR nucleotide-binding domains

Ana Grangeia, Rene Barro, Filipa Carvalho, Ana M. Damas, Ana Colette Maurício, Karl Kunzelmann, Alberto Barros, Mário Sousa

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Background: About 98% of male affected with cystic fibrosis (CF [MIM 219700]) are infertile due to bilateral absence of vas deferens (CBAVD [MIM 277180]), which makes up 1-2 % of all cases with male infertility. A previous screening of the entire coding region of the cystic fibrosis transmembrane conductance regulator gene (CFTR [MIM 602421]) in CBAVD patients identified three novel mutations: P439S is located in the first nucleotide binding domain (NBD1) of CFTR, whereas P1290S and E1401K are located in NBD2. Methods: We analysed the effects of these novel mutations on CFTR processing and chloride (Cl-) channel activity. Results: Although maturation patterns were not affected, total amounts of mature P439S-CFTR and P1290S-CFTR were reduced. Confocal microscopy showed correct membrane localisation of E1401K-CFTR, whereas P439S-CFTR and P1290S-CFTR mutants were located mainly in the cytoplasm. Iodide influx assay and whole-cell patch clamp demonstrated significantly reduced cAMP-dependent anion conductances for all three mutants. Conclusion: Dysfunction of CFTR is caused by either defective CFTR trafficking (P439S and P1290S) or/and Cl- channel function (P1290S and E1401K). Thus reduced Cl- conductance caused by the three CFTR mutations affects normal development of vas deferens and leads to CBAVD, but the remaining function is sufficient to prevent other typical CF symptoms.

Original languageEnglish (US)
Pages (from-to)79-92
Number of pages14
JournalCellular Physiology and Biochemistry
Volume22
Issue number1-4
DOIs
StatePublished - Sep 11 2008
Externally publishedYes

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Keywords

  • CFTR
  • CFTR gene mutation
  • Chloride channel
  • Cystic fibrosis
  • Male infertility
  • Vas deferens

ASJC Scopus subject areas

  • Physiology

Cite this

Grangeia, A., Barro, R., Carvalho, F., Damas, A. M., Maurício, A. C., Kunzelmann, K., Barros, A., & Sousa, M. (2008). Molecular and functional characterization of CBAVD-causing mutations located in CFTR nucleotide-binding domains. Cellular Physiology and Biochemistry, 22(1-4), 79-92. https://doi.org/10.1159/000149785