Ocular manifestations in oculodentodigital dysplasia resulting from a heterozygous missense mutation (L113P) in GJA1 (connexin 43).
OBJECTIVE
To characterize the ophthalmic findings, intrafamilial variability, and molecular genetic basis of oculodentodigital dysplasia (ODDD; MIM no. 164200).


METHODS
Ophthalmic examination included best-corrected visual acuity, slit-lamp biomicroscopy, direct and indirect ophthalmoscopy, Goldmann applanation tonometry and A-scan ultrasonography. Blood samples were taken for DNA extraction and mutation screening of GJA1 (connexin 43).


RESULTS
All three affected individuals had characteristic features of ODDD. The ophthalmic features were epicanthus, microcornea, and the presence of glaucoma. The ocular phenotype resulted from a heterozygous T>C transition at nucleotide 338 in GJA1 (L113P) that was not detected in 120 chromosomes of unaffected individuals. The L113P mutation results in a nonconservative substitution in the cytoplasmic loop of Cx43 (GJA1) and is predicted to disrupt the high-order structure of Cx43.


CONCLUSIONS
This report describes the ocular phenotype in a molecularly characterized ODDD syndrome family. The ocular features in this family highlight the key role Cx43 plays in eye development and in the development of glaucoma. L113P represents a pathogenic mutation in GJA1 (Cx43) and results in ODDD with marked intrafamilial variation in glaucoma type and severity.
Musa
F U
FU
Birmingham and Midland Eye Centre, City Hospital, Birmingham, UK. fayyaz@doctors.net.uk
Ratajczak
P
P
Sahu
J
J
Pentlicky
S
S
Fryer
A
A
Richard
G
G
Willoughby
C E
CE
D000015:Abnormalities, Multiple / Q000235:genetics*; D000328:Adult; D018031:Connexin 43 / Q000235:genetics*; D004252:DNA Mutational Analysis / Q000379:methods; D003744:Dental Enamel Hypoplasia / Q000235:genetics; D005124:Eye Abnormalities / Q000235:genetics*; D019066:Facies; D005260:Female; D005385:Fingers / Q000002:abnormalities; D005901:Glaucoma / Q000235:genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D020125:Mutation, Missense; D010375:Pedigree; D013576:Syndactyly / Q000235:genetics; D013577:Syndrome
D018031:Connexin 43; C500216:GJA1 protein, human