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2015 ; 88
(5
): 494-8
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
A mutation creating an out-of-frame alternative translation initiation site in
the GRHPR 5 UTR causing primary hyperoxaluria type II
#MMPMID25410531
Fu Y
; Rope R
; Fargue S
; Cohen HT
; Holmes RP
; Cohen DM
Clin Genet
2015[Nov]; 88
(5
): 494-8
PMID25410531
show ga
Primary hyperoxaluria type II is a recessive genetic disorder caused by mutations
in the GRHPR gene. Although several dozen mutations have been described, all
affect coding or transcript splicing. A man suspected of having primary
hyperoxaluria type II was heterozygous for a novel single-nucleotide deletion
(c.694delC) in GRHPR affecting Gln(232) , which introduced a pre-mature
termination (p.Gln232Argfs*3). Two 5'untranslated region (UTR) variants of
unknown significance were also noted. We show that these two variants occur in
cis, on the opposite allele, and introduce - immediately upstream of the
canonical translation initiation site - a novel out-of-frame translational start
site. In vitro studies using the GRHPR 5'UTR fused to a luciferase reporter show
that the variant start site pre-empted initiation at the canonical translational
start site, and this was corroborated within the broader context of 1.3?kb of the
GRHPR proximal promoter. This latter mechanism may be underappreciated in
general; reports of clinically significant functional variation of this type are
extremely rare.