A missense mutation in ASRGL1 is involved in causing autosomal recessive retinal degeneration.

Abstract:

:Inherited retinal dystrophies are a group of genetically heterogeneous conditions with broad phenotypic heterogeneity. We analyzed a large five-generation pedigree with early-onset recessive retinal degeneration to identify the causative mutation. Linkage analysis and homozygosity mapping combined with exome sequencing were carried out to map the disease locus and identify the p.G178R mutation in the asparaginase like-1 gene (ASRGL1), segregating with the retinal dystrophy phenotype in the study pedigree. ASRGL1 encodes an enzyme that catalyzes the hydrolysis of L-asparagine and isoaspartyl-peptides. Studies on the ASRGL1 expressed in Escherichia coli and transiently transfected mammalian cells indicated that the p.G178R mutation impairs the autocatalytic processing of this enzyme resulting in the loss of functional ASRGL1 and leaving the inactive precursor protein as a destabilized and aggregation-prone protein. A zebrafish model overexpressing the mutant hASRGL1 developed retinal abnormalities and loss of cone photoreceptors. Our studies suggest that the p.G178R mutation in ASRGL1 leads to photoreceptor degeneration resulting in progressive vision loss.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Biswas P,Chavali VR,Agnello G,Stone E,Chakarova C,Duncan JL,Kannabiran C,Homsher M,Bhattacharya SS,Naeem MA,Kimchi A,Sharon D,Iwata T,Riazuddin S,Reddy GB,Hejtmancik JF,Georgiou G,Riazuddin SA,Ayyagari R

doi

10.1093/hmg/ddw113

subject

Has Abstract

pub_date

2016-06-15 00:00:00

pages

2483-2497

issue

12

eissn

0964-6906

issn

1460-2083

pii

ddw113

journal_volume

25

pub_type

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