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2016 ; 6
(ä): 33652
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Two novel AGXT mutations identified in primary hyperoxaluria type-1 and distinct
morphological and structural difference in kidney stones
#MMPMID27644547
Wang C
; Lu J
; Lang Y
; Liu T
; Wang X
; Zhao X
; Shao L
Sci Rep
2016[Sep]; 6
(ä): 33652
PMID27644547
show ga
Primary hyperoxaluria type 1 (PH1) is a rare genetic disease characterized by
excessive oxalate accumulation in plasma and urine, resulting in various
phenotypes because of allelic and clinical heterogeneity. This study aimed to
detect disease-associated genetic mutations in three PH1 patients in a Chinese
family. All AGXT exons and 3 common polymorphisms which might synergistically
interact with mutations, including P11L, I340?M and IVSI+74?bp were analyzed by
direct sequencing in all family members. It demonstrated that in each of three
patients, a previously reported nonsense mutation p.R333(*) was in cis with a
novel missense mutation p.M49L in the minor allele characterized by the
polymorphism of 74-bp duplication in intron 1, while the other novel missense
mutation p.N72I was in trans with both p.R333(*) and P.M49L in the major allele.
Kidney stones from two sibling patients were also observed though
stereomicroscopic examination and scanning electron microscopy. Distinct
morphological and inner-structure differences in calculi were noticed, suggesting
clinical heterozygosity of PH1 to a certain extent. In brief, two novel missense
mutations were identified probably in association with PH1, a finding which
should provide an accurate tool for prenatal diagnosis, genetic counseling and
screening for potential presymptomatic individuals.