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2017 ; 27
(5
): 402-405
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English Wikipedia
Primary Hyperoxaluria Type 1 with Homozygosity for a Double-mutated AGXT Allele
in a 2-year-old Child
#MMPMID28904440
Krishnamurthy S
; Kartha GB
; Venkateswaran VS
; Prasannakumar M
; Mahadevan S
; Gowda M
; Pelle A
; Giachino D
Indian J Nephrol
2017[Sep]; 27
(5
): 402-405
PMID28904440
show ga
Primary hyperoxaluria (PH) Type 1 is a rare, genetic disorder caused by
deficiency of the liver enzyme alanine-glyoxylate aminotransferase, which is
encoded by AGXT gene. We report a 2-year-old South Indian Tamil child with
nephrocalcinosis due to PH Type 1, in whom a homozygous genotype for two missense
mutations in the AGXT gene was found: first, a C to G transversion (c. 32C>G) in
exon 1 resulting in the amino acid substitution p.Pro11Arg; second, a T to A
transversion (c. 167T>A) in exon 2 resulting in p.Ile56Asn. A therapy based on
potassium citrate and pyridoxine was started. This is the first report of
molecular testing-proven childhood onset-PH Type 1 from South India and is
notable for the co-occurrence of two missense mutations in one AGXT allele, which
might lead to different and more severe phenotype than each mutation alone. To
the best of our knowledge, AGXT allele carrying two already known mutations has
not been previously reported.