Journal
EUROPEAN JOURNAL OF HUMAN GENETICS
Volume 22, Issue 3, Pages 419-422Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ejhg.2013.157
Keywords
ALDH1A3 gene; anophthalmia/microphthalmia; homozogosity mapping
Funding
- Spanish Ministerio de Economia y Competitividad [BFU2011-24176]
- Generalitat de Catalunya [2009 SGR 795]
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Nine affected individuals with isolated anophthalmia/microphthalmia from a large Muslim-inbred kindred were investigated. Assuming autosomal-recessive mode of inheritance, whole-genome linkage analysis, on DNA samples from four affected individuals, was undertaken. Homozygosity mapping techniques were employed and a 1.5-Mbp region, homozygous in all affected individuals, was delineated. The region contained nine genes, one of which, aldehyde dehydrogenase 1 (ALDH1A3), was a clear candidate. This gene seems to encode a key enzyme in the formation of a retinoic-acid gradient along the dorsoventral axis during an early eye development and the development of the olfactory system. Sanger sequence analysis revealed a missense mutation, causing a substitution of valine (Val) to methionine (Met) at position 71. Analyzing the p.Val71Met missense mutation using standard open access software (MutationTaster online, PolyPhen, SIFT/PROVEAN) predicts this variant to be damaging. Enzymatic activity, studied in vitro, showed no changes between the mutated and the wild-type ALDH1A3 protein.
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