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BMC Medical Genetics
Published in: BMC Medical Genetics 1/2019

Open Access 01-12-2019 | Research article

Exome genotyping and linkage analysis identifies two novel linked regions and replicates two others for myopia in Ashkenazi Jewish families

Authors: Claire L. Simpson, Anthony M. Musolf, Qing Li, Laura Portas, Federico Murgia, Roberto Y. Cordero, Jennifer B. Cordero, Bilal A. Moiz, Emily R. Holzinger, Candace D. Middlebrooks, Deyana D. Lewis, Joan E. Bailey-Wilson, Dwight Stambolian

Published in: BMC Medical Genetics | Issue 1/2019

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Abstract

Background

Myopia is one of most common eye diseases in the world and affects 1 in 4 Americans. It is a complex disease caused by both environmental and genetics effects; the genetics effects are still not well understood. In this study, we performed genetic linkage analyses on Ashkenazi Jewish families with a strong familial history of myopia to elucidate any potential causal genes.

Methods

Sixty-four extended Ashkenazi Jewish families were previously collected from New Jersey. Genotypes from the Illumina ExomePlus array were merged with prior microsatellite linkage data from these families. Additional custom markers were added for candidate regions reported in literature for myopia or refractive error. Myopia was defined as mean spherical equivalent (MSE) of -1D or worse and parametric two-point linkage analyses (using TwoPointLods) and multi-point linkage analyses (using SimWalk2) were performed as well as collapsed haplotype pattern (CHP) analysis in SEQLinkage and association analyses performed with FBAT and rv-TDT.

Results

Strongest evidence of linkage was on 1p36(two-point LOD = 4.47) a region previously linked to refractive error (MYP14) but not myopia. Another genome-wide significant locus was found on 8q24.22 with a maximum two-point LOD score of 3.75. CHP analysis also detected the signal on 1p36, localized to the LINC00339 gene with a maximum HLOD of 3.47, as well as genome-wide significant signals on 7q36.1 and 11p15, which overlaps with the MYP7 locus.

Conclusions

We identified 2 novel linkage peaks for myopia on chromosomes 7 and 8 in these Ashkenazi Jewish families and replicated 2 more loci on chromosomes 1 and 11, one previously reported in refractive error but not myopia in these families and the other locus previously reported in the literature. Strong candidate genes have been identified within these linkage peaks in our families. Targeted sequencing in these regions will be necessary to definitively identify causal variants under these linkage peaks.
Appendix
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Metadata
Title
Exome genotyping and linkage analysis identifies two novel linked regions and replicates two others for myopia in Ashkenazi Jewish families
Authors
Claire L. Simpson
Anthony M. Musolf
Qing Li
Laura Portas
Federico Murgia
Roberto Y. Cordero
Jennifer B. Cordero
Bilal A. Moiz
Emily R. Holzinger
Candace D. Middlebrooks
Deyana D. Lewis
Joan E. Bailey-Wilson
Dwight Stambolian
Publication date
01-12-2019
Publisher
BioMed Central
Published in
BMC Medical Genetics / Issue 1/2019
Electronic ISSN: 1471-2350
DOI
https://doi.org/10.1186/s12881-019-0752-8

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