Novel heterozygous OTX2 mutations and whole gene deletions in anophthalmia, microphthalmia and coloboma.
Severe ocular malformations, including anophthalmia-microphthalmia (AM), are responsible for around 25% of severe visual impairment in childhood. Recurrent interstitial deletions of 14q22-23 are associated with AM and a wide range of extra-ocular phenotypes including brain anomalies. The homeobox gene OTX2 is located at 14q22.3 and has recently been identified as mutated in AM patients. Eight human OTX2 mutations have been reported in subjects with severe eye malformations, including AM, and variable developmental delay. We screened a novel AM cohort for mutations and deletions in OTX2, and identified four new mutations in six individuals and two cases of whole gene deletions. Our data suggest that OTX2 mutations and deletions account for 2-3% of AM cases.
Wyatt
Alexander
A
Dept of Physiology, Anatomy and Genetics, University of Oxford, South Parks Road, Oxford, OX1 3QX.
Bakrania
Preeti
P
Bunyan
David J
DJ
Osborne
Robert J
RJ
Crolla
John A
JA
Salt
Alison
A
Ayuso
Carmen
C
Newbury-Ecob
Ruth
R
Abou-Rayyah
Y
Y
Collin
J Richard O
JR
Robinson
David
D
Ragge
Nicola
N
D000293:Adolescent; D000853:Anophthalmos / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D002883:Chromosomes, Human, Pair 14; D003103:Coloboma / Q000235:genetics*; D055028:Comparative Genomic Hybridization; D004252:DNA Mutational Analysis; D002658:Developmental Disabilities / Q000235:genetics; D005260:Female; D017353:Gene Deletion; D006579:Heterozygote; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007223:Infant; D008297:Male; D008850:Microphthalmos / Q000235:genetics*; D051857:Otx Transcription Factors / Q000235:genetics*; D010375:Pedigree; D010641:Phenotype
C497659:OTX2 protein, human; D051857:Otx Transcription Factors