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2014 ; 18
(11
): 741-8
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Molecular investigation of distal renal tubular acidosis in Tunisia, evidence for
founder mutations
#MMPMID25285676
Nagara M
; Voskarides K
; Nouira S
; Ben Halim N
; Kefi R
; Aloulou H
; Romdhane L
; Ben Abdallah R
; Ben Rhouma F
; Aissa K
; Boughamoura L
; Kammoun T
; Azzouz H
; Abroug S
; Ben Turkia H
; Ayadi A
; Mrad R
; Chabchoub I
; Hachicha M
; Chemli J
; Deltas C
; Abdelhak S
Genet Test Mol Biomarkers
2014[Nov]; 18
(11
): 741-8
PMID25285676
show ga
BACKGROUND: Distal renal tubular acidosis (dRTA) is a rare genetic disease caused
by mutations in different genes involved in the secretion of H+ ions in the
intercalated cells of the collecting duct. Both autosomal dominant and recessive
forms have been described; the latter is also associated with sensorineural
hearing loss. METHODS: Twenty-two Tunisian families were analyzed for mutations
in the ATP6V1B1 and ATP6V0A4 genes by direct sequencing. Dating of the founder
mutations was performed. RESULTS: Two founder mutations in the ATP6V1B1 gene were
found in 16/27 dRTA cases. The p.Ile386Hisfs*56 founder mutation was estimated to
be older than 2400 years and no correlations were found with deafness. For the
remaining patients, two mutations in the ATP6V0A4 gene, one of them being novel,
were found in three Tunisian cases. The presence of a heterozygous missense
mutation p.T30I, of the ATP6V1B1 gene, was identified in six patients, while no
mutations of the second gene were detected. No deleterious mutations of either
ATP6V1B1 or ATP6V0A were found for the two probands. CONCLUSION: Our study gives
evidence of phenotypic and genotypic heterogeneity of dRTA in the Tunisian
population. Five different mutations were found, two of them were due to a
founder effect, and screening of these mutations could provide a rapid and
valuable tool for diagnosis of dRTA.