Truncation of NHEJ1 in a patient with polymicrogyria

Vincent Cantagrel, Anne Marie Lossi, Steven Lisgo, Chantal Missirian, Ana Borges, Nicole Philip, Carla Fernandez, Carlos Cardoso, Dominique Figarella-Branger, Anne Moncla, Susan Lindsay, William B. Dobyns, Laurent Villard

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Polymicrogyria (PMG) is a common malformation of the human cerebral cortex for which both acquired and genetic causes are known. Although genetic heterogeneity is documented, only one gene is currently known to cause isolated PMG. To clone new genes involved in this type of cerebral malformation, we studied a fetus presenting a defect of cortical organization consisting of a polymicrogyric cortex and neuronal heterotopia within the white matter. Karyotype analysis revealed that the fetus was carrier of a balanced, de novo, chromosomal translocation t(2;7) (q35;p22). Cloning and sequencing of the two translocation breakpoints reveals that the chromosomal rearrangement disrupts the coding region of a single gene, called NHEJ1, Cernunnos, or XLF, in 2q35. The NHEJ1 gene was recently identified as being responsible for autosomal recessive immunodeficiency with microcephaly. Using quantitative PCR experiments, we show that a truncated transcript is expressed in the polymicrogyric patient cells, suggesting a potential dominant negative effect possibly leading to a different phenotype. We performed in situ hybridization on human embryos and showed that the NHEJ1 transcript is preferentially expressed in the telencephalic ventricular and subventricular zones, consistent with the phenotype of the affected individual. In the human adult central nervous system (CNS), NHEJ1 is mainly expressed in the cerebral cortex and in the cerebellum. The association of PMG with the disruption of its transcript suggests that, in addition to its recently uncovered function in the immune system, the NHEJ1 protein may also play a role during development of the human cerebral cortex.

Original languageEnglish (US)
Pages (from-to)356-364
Number of pages9
JournalHuman mutation
Volume28
Issue number4
DOIs
StatePublished - Apr 2007
Externally publishedYes

Keywords

  • Cernunnos
  • Cortical dysplasia
  • Human embryo
  • NHEJ1
  • Polymicrogyria
  • XLF

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