Variants in myelin regulatory factor (MYRF) cause autosomal dominant and syndromic nanophthalmos in humans and retinal degeneration in mice
Sarah J Garnai, Michelle L Brinkmeier, Ben Emery, Tomas S Aleman, Louise C Pyle, Biliana Veleva-Rotse, Robert A Sisk, Frank W Rozsa, Ayse Bilge Ozel, Jun Z Li, Sayoko E Moroi, Steven M Archer, Cheng-Mao Lin, Sarah Sheskey, Laurel Wiinikka-Buesser, James Eadie, Jill E Urquhart, Graeme C M Black, Mohammad I Othman, Michael Boehnke, Scot A Sullivan, Gregory L Skuta, Hemant S Pawar, Alexander E Katz, Laryssa A Huryn, Robert B Hufnagel, Genomic Ascertainment Cohort, Sally A Camper, Julia E Richards, Lev Prasov, Sarah J Garnai, Michelle L Brinkmeier, Ben Emery, Tomas S Aleman, Louise C Pyle, Biliana Veleva-Rotse, Robert A Sisk, Frank W Rozsa, Ayse Bilge Ozel, Jun Z Li, Sayoko E Moroi, Steven M Archer, Cheng-Mao Lin, Sarah Sheskey, Laurel Wiinikka-Buesser, James Eadie, Jill E Urquhart, Graeme C M Black, Mohammad I Othman, Michael Boehnke, Scot A Sullivan, Gregory L Skuta, Hemant S Pawar, Alexander E Katz, Laryssa A Huryn, Robert B Hufnagel, Genomic Ascertainment Cohort, Sally A Camper, Julia E Richards, Lev Prasov
Abstract
Nanophthalmos is a rare, potentially devastating eye condition characterized by small eyes with relatively normal anatomy, a high hyperopic refractive error, and frequent association with angle closure glaucoma and vision loss. The condition constitutes the extreme of hyperopia or farsightedness, a common refractive error that is associated with strabismus and amblyopia in children. NNO1 was the first mapped nanophthalmos locus. We used combined pooled exome sequencing and strong linkage data in the large family used to map this locus to identify a canonical splice site alteration upstream of the last exon of the gene encoding myelin regulatory factor (MYRF c.3376-1G>A), a membrane bound transcription factor that undergoes autoproteolytic cleavage for nuclear localization. This variant produced a stable RNA transcript, leading to a frameshift mutation p.Gly1126Valfs*31 in the C-terminus of the protein. In addition, we identified an early truncating MYRF frameshift mutation, c.769dupC (p.S264QfsX74), in a patient with extreme axial hyperopia and syndromic features. Myrf conditional knockout mice (CKO) developed depigmentation of the retinal pigment epithelium (RPE) and retinal degeneration supporting a role of this gene in retinal and RPE development. Furthermore, we demonstrated the reduced expression of Tmem98, another known nanophthalmos gene, in Myrf CKO mice, and the physical interaction of MYRF with TMEM98. Our study establishes MYRF as a nanophthalmos gene and uncovers a new pathway for eye growth and development.
Conflict of interest statement
The authors have declared that no competing interests exist.
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References
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