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Siggs OM, Awadalla MS, Souzeau E, Staffieri SE, Kearns LS, Laurie K, Kuot A, Qassim A, Edwards TL, Coote MA, Mancel E, Walland MJ, Dondey J, Galanopoulous A, Casson RJ, Mills RA, MacArthur DG, Ruddle JB, Burdon KP, Craig JE. The genetic and clinical landscape of nanophthalmos and posterior microphthalmos in an Australian cohort. Clin Genet 2020; 97:764-769. [PMID: 32052405 DOI: 10.1111/cge.13722] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 02/04/2020] [Accepted: 02/06/2020] [Indexed: 11/30/2022]
Abstract
Nanophthalmos and posterior microphthalmos are ocular abnormalities in which both eyes are abnormally small, and typically associated with extreme hyperopia. We recruited 40 individuals from 13 kindreds with nanophthalmos or posterior microphthalmos, with 12 probands subjected to exome sequencing. Nine probands (69.2%) were assigned a genetic diagnosis, with variants in MYRF, TMEM98, MFRP, and PRSS56. Two of four PRSS56 families harbored the previously described c.1066dupC variant implicated in over half of all reported PRSS56 kindreds, with different surrounding haplotypes in each family suggesting a mutational hotspot. Individuals with a genetic diagnosis had shorter mean axial lengths and higher hyperopia than those without, with recessive forms associated with the most extreme phenotypes. These findings detail the genetic architecture of nanophthalmos and posterior microphthalmos in a cohort of predominantly European ancestry, their relative clinical phenotypes, and highlight the shared genetic architecture of rare and common disorders of refractive error.
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Affiliation(s)
- Owen M Siggs
- Department of Ophthalmology, Flinders University, Adelaide, Australia
| | - Mona S Awadalla
- Department of Ophthalmology, Flinders University, Adelaide, Australia
| | | | - Sandra E Staffieri
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Australia.,Department of Ophthalmology, University of Melbourne, Melbourne, Australia.,Department of Ophthalmology, Royal Children's Hospital, Melbourne, Australia
| | - Lisa S Kearns
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Australia
| | - Kate Laurie
- Department of Ophthalmology, Flinders University, Adelaide, Australia
| | - Abraham Kuot
- Department of Ophthalmology, Flinders University, Adelaide, Australia
| | - Ayub Qassim
- Department of Ophthalmology, Flinders University, Adelaide, Australia
| | - Thomas L Edwards
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Australia
| | - Michael A Coote
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Australia
| | - Erica Mancel
- Centre Hospitalier Territorial de Nouvelle-Calédonie, Noumea, New Caledonia
| | - Mark J Walland
- Royal Victorian Eye and Ear Hospital, Melbourne, Australia
| | - Joanne Dondey
- Royal Victorian Eye and Ear Hospital, Melbourne, Australia
| | - Anna Galanopoulous
- Discipline of Ophthalmology & Visual Sciences, University of Adelaide, Adelaide, Australia
| | - Robert J Casson
- Discipline of Ophthalmology & Visual Sciences, University of Adelaide, Adelaide, Australia
| | - Richard A Mills
- Department of Ophthalmology, Flinders University, Adelaide, Australia
| | - Daniel G MacArthur
- Program in Medical and Population Genetics, Broad Institute of MIT and Harvard, Boston, Massachusetts.,Analytic and Translational Genetics Unit, Massachusetts General Hospital, Boston, Massachusetts
| | - Jonathan B Ruddle
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Australia.,Department of Ophthalmology, University of Melbourne, Melbourne, Australia.,Department of Ophthalmology, Royal Children's Hospital, Melbourne, Australia
| | - Kathryn P Burdon
- Department of Ophthalmology, Flinders University, Adelaide, Australia.,Menzies Institute for Medical Research, University of Tasmania, Hobart, Australia
| | - Jamie E Craig
- Department of Ophthalmology, Flinders University, Adelaide, Australia
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