Human Molecular Genetics, Vol 7, 1113-1117, Copyright © 1998 by Oxford University Press
SC Kulak, K Kozlowski, EV Semina, WG Pearce and MA Walter
Axenfeld-Rieger syndrome (ARS) and iridogoniodysgenesis syndrome (IGDS) are
clinically related autosomal dominant disorders which affect the anterior
segment of the eye as well as non-ocular structures. ARS patients present
with iris hypoplasia, a prominent Schwalbe line, adhesions between the iris
stroma and the iridocorneal angle and increased intraocular pressure. IGDS
is characterized by iris hypoplasia, goniodysgenesis and increased
intraocular pressure. Each syndrome also presents with non-ocular features
including maxillary hypoplasia, micro and anodontia, redundant
periumbilical skin, hypospadius (in males), and each has been genetically
linked to chromosome 4q25. RIEG1 , the gene responsible for the 4q25 ARS
phenotype, recently has been cloned. RIEG1 encodes a novel member of the
bicoid class of homeobox proteins known to be active as transcription
factors. Mutational analysis has previously detected several mutations in
this gene in ARS individuals. We have now detected a mutation in RIEG1
which segregates with the disease phenotype in a family with IGDS. This
mutation is a G-->A transition altering an arginine residue to a
histidine in a highly conserved location in the second helix of the
homeobox of RIEG1. This mutation indicates that IGDS and ARS are allelic
variants of the same disorder. This wide variability in clinical
consequences of mutations at the RIEG1 4q25 locus implicates the RIEG gene
broadly in ocular and craniofacial disorders.
ARTICLES
Mutation in the RIEG1 gene in patients with iridogoniodysgenesis syndrome
Department of Medical Genetics, University of Alberta, Edmonton, Alberta T6G 2S2, Canada.
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