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Mutations in ALDH1A3 cause microphthalmia.

M A Aldahmesh¹, A O Khan, H Hijazi

¹Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.

Clinical Genetics

|May 8, 2013

Summary

Genetic variants in ALDH1A3 and SMOC1 cause severe eye development disorders like microphthalmia and anophthalmia. This study identifies novel mutations, highlighting genetic heterogeneity in affected families.

Keywords:

BMP consanguinity exome locus heterogeneity retinoic acid

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Area of Science:

Genetics
Developmental Biology
Ophthalmology

Background:

Microphthalmia and anophthalmia are congenital eye malformations with potential multisystemic implications.
These conditions result from single gene mutations, but the genetic landscape is continually expanding.

Observation:

Autozygome analysis in a multiplex family with microphthalmia/anophthalmia excluded known genes.
Exome sequencing identified a novel homozygous ALDH1A3 variant in one family branch.
Another family branch segregated anophthalmia/syndactyly with a novel homozygous SMOC1 variant.

Findings:

This study confirms ALDH1A3 as a causative gene for microphthalmia, identifying novel variants.
A novel SMOC1 variant is associated with anophthalmia and syndactyly, indicating locus heterogeneity.
Two distinct genetic causes (ALDH1A3 and SMOC1) were identified in different family branches.

Implications:

The findings expand the known genetic causes of eye developmental anomalies.
Genetic testing for ALDH1A3 and SMOC1 should be considered in patients with microphthalmia/anophthalmia, especially in consanguineous families.
This research underscores the importance of considering locus heterogeneity even for rare genetic disorders.