Targeted mutagenesis of Lis1 disrupts cortical development and LIS1 homodimerization

Aviv Cahana, Teresa Escamez, Richard S. Nowakowski, Nancy L. Hayes, Mai Britt Giacobini, Alexander Von Holst, Orit Shmueli, Tamar Sapir, Susan K. McConnell, Wolfgang Wurst, Salvador Martinez, Orly Reiner

Research output: Contribution to journalArticlepeer-review

135 Scopus citations

Abstract

Lissencephaly is a severe brain malformation in humans. To study the function of the gene mutated in lissencephaly (LIS1), we deleted the first coding exon from the mouse Lis1 gene. The deletion resulted in a shorter protein (sLIS1) that initiates from the second methionine, a unique situation because most LIS1 mutations result in a null allele. This mutation mimics a mutation described in one lissencephaly patient with a milder phenotype. Homozygotes are early lethal, although heterozygotes are viable and fertile. Most strikingly, the morphology of cortical neurons and radial glia is aberrant in the developing cortex, and the neurons migrate more slowly. This is the first demonstration, to our knowledge, of a cellular abnormality in the migrating neurons after Lis1 mutation. Moreover, cortical plate splitting and thalamocortical innervation are also abnormal. Biochemically, the mutant protein is not capable of dimerization, and enzymatic activity is elevated in the embryos, thus a demonstration of the in vivo role of LIS1 as a subunit of PAF-AH. This mutation allows us to determine a hierarchy of functions that are sensitive to LIS1 dosage, thus promoting our understanding of the role of LIS1 in the developing cortex.

Original languageEnglish
Pages (from-to)6429-6434
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume98
Issue number11
DOIs
StatePublished - 22 May 2001
Externally publishedYes

Keywords

  • Acetylhydrolase
  • Brain development
  • Gene targeting
  • Lissencephaly
  • Platelet-activating factor

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