Human Molecular Genetics, Vol 6, 1341-1347, Copyright © 1997 by Oxford University Press
JW Ellison, Z Wardak, MF Young, P Gehron Robey, M Laig-Webster and W Chiong
The abnormalities seen in Turner syndrome (monosomy X) presumably result
from haploinsufficiency of certain genes on the X chromosome. Gene dosage
considerations lead to the prediction that the culpable genes escape X
inactivation and have functional homologs on the Y chromosome. Among the
genes with these characteristics are those residing in the pseudoautosomal
regions (PAR) of the sex chromosomes. A pseudoautosomal location for a
dosage-sensitive locus involved in stature has been suggested based on the
analyses of patients with deletions of a specific segment of the short arm
PAR; hemizygosity for this putative locus probably also contributes to the
short stature in Turner individuals. We have isolated a gene from the
critical deleted region that encodes a novel homeodomain-containing
transcription factor and is expressed at highest levels in osteogenic
cells. We have named the gene PHOG, for pseudoautosomal homeobox-containing
osteogenic gene. Its deletion in patients with short stature, the predicted
altered dosage in 45,X individuals, along with the nature of the encoded
protein and its expression pattern, make PHOG an attractive candidate for
involvement in the short stature of Turner syndrome. We have also found
that the mouse homolog of PHOG is autosomal, which may help to explain the
lack of a growth abnormality in mice with monosomy X.
ARTICLES
PHOG, a candidate gene for involvement in the short stature of Turner syndrome
Department of Pediatrics, University of California, San Francisco 94143, USA. ellison@cgl.ucsf.edu
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