Human Molecular Genetics, Vol 5, 1695-1701, Copyright © 1996 by Oxford University Press
MH Jones, RA Furlong, H Burkin, IJ Chalmers, GM Brown, O Khwaja and NA Affara
EST 221 derived from human adult testis detects homology to the Drosophila
fat facets gene (fat) and has related sequences on both the X and Y
chromosomes mapping to Xp11.4 and Yq11.2 respectively. These two loci have
been termed DFFRX and DFFRY for Drosophila fat facets related X and Y. The
major transcript detected by EST 221 is-8 kb in size and is expressed
widely in a range of 16 human adult tissues. RT- PCR analysis of 13
different human embryonic tissues with primers specific for the X and Y
sequences demonstrates that both loci are expressed in developing tissues
and quantitative RT-PCR of lymphoblastoid cell lines carrying different
numbers of X chromosomes reveals that the X-linked gene escapes
X-inactivation. The amino acid sequence (2547 residues) of the complete
open reading frame of the X gene has 44% identity and 88% similarity to the
Drosophila sequence and contains the conserved Cys and His domains
characteristic of deubiquitinating enzymes, suggesting its biochemical
function may be the hydrolysis of ubiquitin from protein-ubiquitin
conjugates. The requirement of faf for normal oocyte development in
Drosophila combined with the map location and escape from X-inactivation of
DFFRX raises the possibility that the human homologue plays a role in the
defects of oocyte proliferation and subsequent gonadal degeneration found
in Turner syndrome.
ARTICLES
The Drosophila developmental gene fat facets has a human homologue in Xp11.4 which escapes X-inactivation and has related sequences on Yq11.2 [published erratum appears in Hum Mol Genet 1997 Feb;6(2):334-5]
University of Cambridge, Department of Pathology, UK.
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