Biallelic loss of human CTNNA2, encoding αN-catenin, leads to ARP2/3 complex overactivity and disordered cortical neuronal migration.
Nat Genet
; 50(8): 1093-1101, 2018 08.
Article
in En
| MEDLINE
| ID: mdl-30013181
ABSTRACT
Neuronal migration defects, including pachygyria, are among the most severe developmental brain defects in humans. Here, we identify biallelic truncating mutations in CTNNA2, encoding αN-catenin, in patients with a distinct recessive form of pachygyria. CTNNA2 was expressed in human cerebral cortex, and its loss in neurons led to defects in neurite stability and migration. The αN-catenin paralog, αE-catenin, acts as a switch regulating the balance between ß-catenin and Arp2/3 actin filament activities1. Loss of αN-catenin did not affect ß-catenin signaling, but recombinant αN-catenin interacted with purified actin and repressed ARP2/3 actin-branching activity. The actin-binding domain of αN-catenin or ARP2/3 inhibitors rescued the neuronal phenotype associated with CTNNA2 loss, suggesting ARP2/3 de-repression as a potential disease mechanism. Our findings identify CTNNA2 as the first catenin family member with biallelic mutations in humans, causing a new pachygyria syndrome linked to actin regulation, and uncover a key factor involved in ARP2/3 repression in neurons.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cell Movement
/
Cerebral Cortex
/
Actin-Related Protein 2-3 Complex
/
Alpha Catenin
/
Neurons
Type of study:
Prognostic_studies
Limits:
Animals
/
Humans
Language:
En
Journal:
Nat Genet
Journal subject:
GENETICA MEDICA
Year:
2018
Type:
Article
Affiliation country:
United States