Bi-allelic Loss of Human APC2, Encoding Adenomatous Polyposis Coli Protein 2, Leads to Lissencephaly, Subcortical Heterotopia, and Global Developmental Delay

Sangmoon Lee, Dillon Y. Chen, Maha S. Zaki, Reza Maroofian, Henry Houlden, Nataliya Di Donato, Dalia Abdin, Heba Morsy, Ghayda M. Mirzaa, William B. Dobyns, Jennifer McEvoy-Venneri, Valentina Stanley, Kiely N. James, Grazia M.S. Mancini, Rachel Schot, Tugba Kalayci, Umut Altunoglu, Ehsan Ghayoor Karimiani, Lauren Brick, Mariya KozenkoYalda Jamshidi, M. Chiara Manzini, Mehran Beiraghi Toosi, Joseph G. Gleeson

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Lissencephaly is a severe brain malformation in which failure of neuronal migration results in agyria or pachygyria and in which the brain surface appears unusually smooth. It is often associated with microcephaly, profound intellectual disability, epilepsy, and impaired motor abilities. Twenty-two genes are associated with lissencephaly, accounting for approximately 80% of disease. Here we report on 12 individuals with a unique form of lissencephaly; these individuals come from eight unrelated families and have bi-allelic mutations in APC2, encoding adenomatous polyposis coli protein 2. Brain imaging studies demonstrate extensive posterior predominant lissencephaly, similar to PAFAH1B1-associated lissencephaly, as well as co-occurrence of subcortical heterotopia posterior to the caudate nuclei, “ribbon-like” heterotopia in the posterior frontal region, and dysplastic in-folding of the mesial occipital cortex. The established role of APC2 in integrating the actin and microtubule cytoskeletons to mediate cellular morphological changes suggests shared function with other lissencephaly-encoded cytoskeletal proteins such as α-N-catenin (CTNNA2) and platelet-activating factor acetylhydrolase 1b regulatory subunit 1 (PAFAH1B1, also known as LIS1). Our findings identify APC2 as a radiographically distinguishable recessive form of lissencephaly.

Original languageEnglish (US)
Pages (from-to)844-853
Number of pages10
JournalAmerican Journal of Human Genetics
Volume105
Issue number4
DOIs
StatePublished - Oct 3 2019
Externally publishedYes

Keywords

  • agyria
  • APC2
  • band heterotopia
  • epilepsy
  • epilepsy
  • intellectual disability
  • lissencephaly
  • neuronal migration
  • pachygyria

PubMed: MeSH publication types

  • Journal Article
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

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