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Link to original content: https://pubmed.ncbi.nlm.nih.gov/19420906
Clinical and analytical findings in Gitelman's syndrome associated with homozygosity for the c.1925 G>A SLC12A3 mutation - PubMed Skip to main page content
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. 2009;30(3):218-21.
doi: 10.1159/000218104. Epub 2009 May 7.

Clinical and analytical findings in Gitelman's syndrome associated with homozygosity for the c.1925 G>A SLC12A3 mutation

Eliecer Coto  1 , Gabriel Arriba, Mónica García-Castro, Fernando Santos, Ana I Corao, Marta Díaz, Marta Sánchez Heras, María A Basterrechea, Serafín Tallón, Victoria Alvarez
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Clinical and analytical findings in Gitelman's syndrome associated with homozygosity for the c.1925 G>A SLC12A3 mutation

Eliecer Coto et al. Am J Nephrol. 2009.

Abstract

Background: Gitelman's syndrome (GS) is caused by mutations in the SLC12A3. Most of the mutations are rare, making it difficult to establish a genotype-phenotype correlation. Although GS is a recessive disorder, some patients also have an affected parent, suggesting a dominant inheritance.

Methods: We sequenced the 26 coding exons of SLC12A3 in a family in which the proband and her father had a late onset GS. We obtained cDNA of the 2 patients and analyzed the effect of a mutation on pre-mRNA splicing.

Results: The 2 patients were homozygous for a nucleotide change in the last nucleotide of exon 15: c.1925 G>A. The mother was a heterozygous carrier for this putative mutation. Amplification of cDNA with primers for exons 14-17 was negative, suggesting that this mutation affected the splicing and promoted mRNA degradation through nonsense-mediated decay.

Conclusions: We report a family with 2 patients with late onset GS and homozygous for a mutation in the last nucleotide of exon 15. Our study shows that homozygosity for this mutation resulted in a significant loss of normal SLC12A3 transcript.

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