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2016 ; 4
(3
): 303-11
Nephropedia Template TP
gab.com Text
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English Wikipedia
Mutations in ATP6V1B1 and ATP6V0A4 genes cause recessive distal renal tubular
acidosis in Mexican families
#MMPMID27247958
Escobar LI
; Simian C
; Treard C
; Hayek D
; Salvador C
; Guerra N
; Matos M
; Medeiros M
; Enciso S
; Camargo MD
; Vargas-Poussou R
Mol Genet Genomic Med
2016[May]; 4
(3
): 303-11
PMID27247958
show ga
BACKGROUND: Autosomal recessive distal renal tubular acidosis (dRTA) is a rare
disease characterized by a hyperchloremic metabolic acidosis with normal anion
gap, hypokalemia, hypercalciuria, hypocitraturia, nephrocalcinosis, and conserved
glomerular filtration rate. In some cases, neurosensorial deafness is associated.
dRTA is developed during the first months of life and the main manifestations are
failure to thrive, vomiting, dehydration, and anorexia. METHODS: Nine unrelated
families were studied: seven children, a teenager, and an adult with dRTA.
Hearing was preserved in four children. Coding regions of the genes responsible
for recessive dRTA were analysed by Sanger sequencing. RESULTS: Molecular defects
were found in the genes ATP6V1B1 and ATP6V0A4. We identified three homozygous
variants in ATP6V1B: a frameshift mutation (p.Ile386Hisfs*56), a nucleotide
substitution in exon 10 (p.Pro346Arg), and a new splicing mutation in intron 5.
Three patients were homozygous for one novel (p.Arg743Trp) and one known
(p.Asp411Tyr) missense mutations in the ATP6V0A4 gene. Three patients were
compound heterozygous: one proband displayed two novel mutations, the frameshift
mutation p.Val52Metfs*25, and a large deletion of exons 18-21; two probands
showed the missense mutation p.Asp411Tyr and as a second mutation, p.Arg194Ter
and c.1691+2dup, respectively. CONCLUSION: ATP6V0A4 and ATP6V1B1 genes were
involved in recessive dRTA of Mexican families. All ATP6V1B1 mutations detected
were homozygous and all patients developed sensorineural hearing loss (SNHL)
early in infancy. ATP6V0A4 mutations were found in one infant and three children
without SNHL, and in one teenager and one adult with SNHL confirming the
phenotypic variability in this trait. The mutation p.Asp411Tyr detected in four
Mexican families was due to a founder effect. Screening of these mutations could
provide a rapid and valuable tool for diagnosis of dRTA in this population.