Human Molecular Genetics, Vol 6, 147-155, Copyright © 1997 by Oxford University Press
SS Chong, SD Pack, AV Roschke, A Tanigami, R Carrozzo, AC Smith, WB Dobyns and DH Ledbetter
Miller-Dieker syndrome (MDS) is a multiple malformation syndrome
characterized by classical lissencephaly and a characteristic facies. It is
associated with visible or submicroscopic deletions within chromosome band
17p13.3. Lissencephaly without facial dysmorphism has also been observed
and is referred to as isolated lissencephaly sequence (ILS). Apparently
partial and non-overlapping deletions of the 5' or 3' end of a candidate
gene LIS1 in one ILS and one MDS patient had suggested that MDS was a
single gene disorder, and that LIS1 spans in excess of 400 kb. However, the
originally presumed 5' end of LIS1 was found to belong to the 14-33 epsilon
gene residing more distally on 17p13.3. We have now isolated the correct 5'
end of LIS1, constructed a approximately 500 kb genomic contig encompassing
LIS1, and estimated its gene to be approximately 80 kg. Fluorescence in
situ hybridization analysis of an ILS patient with a de novo balanced
translocation, as well as analysis of several other key MDS and ILS
deletion patients, localizes the lissencephaly critical region within the
LIS1 gene. Therefore, LIS1 remains the strongest candidate gene for the
lissencephaly phenotype in ILS and MDS. Our analyses also suggest that
additional genes distal to LIS1 may be responsible for the facial
dysmorphology and other abnormalities seen in MDS but not in ILS patients,
supporting our original concept MDS as a contiguous gene deletion syndrome.
ARTICLES
A revision of the lissencephaly and Miller-Dieker syndrome critical regions in chromosome 17p13.3
National Center for Human Genome Research, National Institutes of Health, Bethesda, MD 20892, USA.
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