Increased LIS1 expression affects human and mouse brain development.
Deletions of the PAFAH1B1 gene (encoding LIS1) in 17p13.3 result in isolated lissencephaly sequence, and extended deletions including the YWHAE gene (encoding 14-3-3epsilon) cause Miller-Dieker syndrome. We identified seven unrelated individuals with submicroscopic duplication in 17p13.3 involving the PAFAH1B1 and/or YWHAE genes, and using a 'reverse genomics' approach, characterized the clinical consequences of these duplications. Increased PAFAH1B1 dosage causes mild brain structural abnormalities, moderate to severe developmental delay and failure to thrive. Duplication of YWHAE and surrounding genes increases the risk for macrosomia, mild developmental delay and pervasive developmental disorder, and results in shared facial dysmorphologies. Transgenic mice conditionally overexpressing LIS1 in the developing brain showed a decrease in brain size, an increase in apoptotic cells and a distorted cellular organization in the ventricular zone, including reduced cellular polarity but preserved cortical cell layer identity. Collectively, our results show that an increase in LIS1 expression in the developing brain results in brain abnormalities in mice and humans.
Bi
Weimin
W
Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA.
Sapir
Tamar
T
Shchelochkov
Oleg A
OA
Zhang
Feng
F
Withers
Marjorie A
MA
Hunter
Jill V
JV
Levy
Talia
T
Shinder
Vera
V
Peiffer
Daniel A
DA
Gunderson
Kevin L
KL
Nezarati
Marjan M
MM
Shotts
Vern Ann
VA
Amato
Stephen S
SS
Savage
Sarah K
SK
Harris
David J
DJ
Day-Salvatore
Debra-Lynn
DL
Horner
Michele
M
Lu
Xin-Yan
XY
Sahoo
Trilochan
T
Yanagawa
Yuchio
Y
Beaudet
Arthur L
AL
Cheung
Sau Wai
SW
Martinez
Salvador
S
Lupski
James R
JR
Reiner
Orly
O
D043203:1-Alkyl-2-acetylglycerophosphocholine Esterase / Q000235:genetics* / Q000378:metabolism / Q000502:physiology*; D000293:Adolescent; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000196:embryology* / Q000254:growth & development; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D002886:Chromosomes, Human, Pair 17; D054221:Classical Lissencephalies and Subcortical Band Heterotopias / Q000235:genetics; D004622:Embryo, Mammalian; D005260:Female; D020440:Gene Duplication; D018507:Gene Expression Regulation, Developmental / Q000502:physiology; D006801:Humans; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D008869:Microtubule-Associated Proteins / Q000235:genetics* / Q000378:metabolism / Q000502:physiology*; D008969:Molecular Sequence Data; D010375:Pedigree; D015854:Up-Regulation / Q000502:physiology
D008869:Microtubule-Associated Proteins; D043203:1-Alkyl-2-acetylglycerophosphocholine Esterase; C084102:PAFAH1B1 protein, human