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2017 ; 7
(7
): 2327-2335
Nephropedia Template TP
gab.com Text
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Twit Text #
English Wikipedia
A Coding Variant in the Gene Bardet-Biedl Syndrome 4 (BBS4) Is Associated with a
Novel Form of Canine Progressive Retinal Atrophy
#MMPMID28533336
Chew T
; Haase B
; Bathgate R
; Willet CE
; Kaukonen MK
; Mascord LJ
; Lohi HT
; Wade CM
G3 (Bethesda)
2017[Jul]; 7
(7
): 2327-2335
PMID28533336
show ga
Progressive retinal atrophy is a common cause of blindness in the dog and affects
>100 breeds. It is characterized by gradual vision loss that occurs due to the
degeneration of photoreceptor cells in the retina. Similar to the human
counterpart retinitis pigmentosa, the canine disorder is clinically and
genetically heterogeneous and the underlying cause remains unknown for many
cases. We use a positional candidate gene approach to identify putative variants
in the Hungarian Puli breed using genotyping data of 14 family-based samples
(CanineHD BeadChip array, Illumina) and whole-genome sequencing data of two
proband and two parental samples (Illumina HiSeq 2000). A single nonsense SNP in
exon 2 of BBS4 (c.58A > T, p.Lys20*) was identified following filtering of high
quality variants. This allele is highly associated (P(CHISQ) = 3.425e(-14), n =
103) and segregates perfectly with progressive retinal atrophy in the Hungarian
Puli. In humans, BBS4 is known to cause Bardet-Biedl syndrome which includes a
retinitis pigmentosa phenotype. From the observed coding change we expect that no
functional BBS4 can be produced in the affected dogs. We identified canine
phenotypes comparable with Bbs4-null mice including obesity and spermatozoa
flagella defects. Knockout mice fail to form spermatozoa flagella. In the
affected Hungarian Puli spermatozoa flagella are present, however a large
proportion of sperm are morphologically abnormal and <5% are motile. This
suggests that BBS4 contributes to flagella motility but not formation in the dog.
Our results suggest a promising opportunity for studying Bardet-Biedl syndrome in
a large animal model.