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2013 ; 35
(9
): 1281-4
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ATP6V1B1 mutations in distal renal tubular acidosis and sensorineural hearing
loss: clinical and genetic spectrum of five families
#MMPMID23923981
Subasioglu Uzak A
; Cakar N
; Comak E
; Yalcinkaya F
; Tekin M
Ren Fail
2013[Oct]; 35
(9
): 1281-4
PMID23923981
show ga
Distal renal tubular acidosis (DRTA) is characterized by tubular defects in
urinary acidification and hyperchloremic metabolic acidosis, hypokalemia,
hypercalciuria, hypocitraturia, nephrocalcinosis and nephrolithiasis. Mutations
in ATP6V1B1 cause DRTA associated with sensorineural hearing loss. The objective
of this multicenter study is to screen DRTA patients with sensorineural hearing
loss for ATP6V1B1 gene mutations and present genotype/phenotype correlation.
Clinical data in five unrelated consanguineous families with DRTA and hearing
loss were obtained in Turkey. For mutation screening, all coding exons of
ATP6V1B1 were PCR-amplified and sequenced from genomic DNA. In our cohort of five
families, there were four different homozygous ATP6V1B1 mutations in affected
individuals: c.91C>T (p.R31X), c.232G>A (p.G78R), c.497delC (p.T166RfsX9) and
c.1155dupC (p.I386HfsX56). Our study shows that rare and family-specific variants
in ATP6V1B1 are responsible for DRTA and sensorineural hearing loss syndrome in
Turkey. While firm genotype-phenotype correlations are not available, detailed
clinical and molecular analyses provide data to be used in genetic counseling.