Identification of ectodysplasin-A receptor gene deletion at 2q12.2 and a potential autosomal MR locus.
Mental retardation (MR) is not a common feature observed in patients with classical ectodermal dysplasias (EDs). Several genes responsible for EDs and MR have been identified. However, the causation has yet to be identified in a significant number of patients with either ED or MR. Here, we have molecularly characterized a de novo balanced translocation t(1;6)(p22.1;p22.1) in a female patient who had mild features of ED with hypodontia, microcephaly, and cognitive impairment. Mapping of the translocation breakpoints in the patient revealed no obvious causative gene for either ED or MR. Whole genome array CGH analysis unveiled two novel submicroscopic deletions at 2q12.2 and 6q22.3, unrelated to the translocation in the patient. The 2q12.2 deletion contains a known ED gene, ectodysplasin-A receptor (EDAR), and the loss of one copy of this gene is considered to be responsible for the ectodermal phenotype in the patient. It is plausible that a potential autosomal MR gene deleted at 2q12.2 or 6q22.3 is likely the cause of the neurodevelopmental defects in the patient.
J.C. Self Research Institute of Human Genetics, Greenwood Genetic Center, Greenwood, SC 29646, USA.
Bradley L
BL
Griggs
Sydney
S
Ladd
Amy
A
Decker
Barbara R
BR
DuPont
Alexander
A
Asamoah
Anand K
AK
Srivastava
D018528:ATP-Binding Cassette Transporters / Q000235:genetics; D000848:Anodontia / Q000235:genetics; D002648:Child; D002889:Chromosomes, Human, Pair 2 / Q000235:genetics; D002896:Chromosomes, Human, Pair 6 / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics; D004476:Ectodermal Dysplasia / Q000235:genetics*; D053339:Edar Receptor / Q000235:genetics*; D005260:Female; D017353:Gene Deletion; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D008831:Microcephaly / Q000235:genetics; D009154:Mutation; D010641:Phenotype; D016133:Polymerase Chain Reaction; D014178:Translocation, Genetic
C063305:ABCD3 protein, human; D018528:ATP-Binding Cassette Transporters; D004268:DNA-Binding Proteins; C506008:EDAR protein, human; D053339:Edar Receptor