© 1994 Oxford University Press
RESEARCH-ARTICLE |
Cloning and characterization of the human choroideremia gene
Department of Human Genetics, University Hospital Nijmegen PO Box 9101, 6500 HB Nijmegen, The Netherlands 1Laboratoire de Génétique, Centre Régional de Transfusion Sanguine Vandoeuvre les Nancy cedex, France 2Human Genetics Department, Roswell Park Cancer Institute Buffalo, NY, USA
*To whom correspondence should be addressed
Received March 14, 1994; Revised May 6, 1994; Accepted May 6, 1994
Positional cloning has previously resulted in the identification of a gene which is disrupted by deletions in patients with the classic choroideremia (CHM) phenotype. More subtle mutations had been identified in 4 exons of the 3' portion but not elsewhere in the CHM gene. We have now isolated and characterized the complete open reading frame of the CHM gene and determined its exon-intron structure. The CHM gene encodes a protein of 653 amino acids, which is highly homologous to the mouse and rat CHM proteins, and, to a slightly lesser extent, to the human CHM-like (CHML) protein. The open reading frame (ORF) of the human CHM gene consists of 15 exons, spanning at least 150 kb of Xq21.2, and it is possible that there is an additional exon corresponding to the 5' non-coding region of the gene. Cloning of the 5' end of the CHM gene and the elucidation of its intronexon structure enabled us to localize the X-chromosomal breakpoint in a CHM female with an X;7 translocation between exons 3 and 4.
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