Comprehensive sequencing of the myocilin gene in a selected cohort of severe primary open-angle glaucoma patients

Scientific Reports
Luke O'GormanJane Gibson

Abstract

Primary open-angle glaucoma (POAG) is the most common form of glaucoma, prevalent in approximately 1-2% of Caucasians in the UK over the age of 40. It is characterised by an open anterior chamber angle, raised intraocular pressure (IOP) and optic nerve damage leading to loss of sight. The myocilin gene (MYOC) is the most common glaucoma-causing gene, accounting for ~2% of British POAG cases. 358 patients were selected for next generation sequencing (NGS) with the following selection criteria: Caucasian ethnicity, intraocular pressure (IOP) 21-40 mm Hg, cup:disc ratio ≥0.6 and visual field mean deviation ≤-3. The entire MYOC gene (17,321 bp) was captured including the promoter, introns, UTRs and coding exons. We identify 12 exonic variants (one stop-gain, five missense and six synonymous variants), two promoter variants, 133 intronic variants, two 3' UTR variants and 23 intergenic variants. Four known or predicted pathogenic exonic variants (p.R126W, p.K216K, p.Q368* and p.T419A) were identified across 11 patients, which accounts for 3.07% of this POAG cohort. This is the first time that the entire region of MYOC has been sequenced and variants reported for a cohort of POAG patients.

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Software Mentioned

FATHMM
Phred
CADD
RepeatMasker
ANNOVAR
BEDtools
Phylop
MutPred Splice
CNVkit
mem

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