Excess LINC complexes impair brain morphogenesis in a mouse model of recessive-TOR1A disease

Heterozygosity for a TOR1A mutation causes semi-penetrant childhood-onset dystonia. More recently, homozygous TOR1A mutations were shown to cause severe neurological dysfunction in infants. However, there is little known about this disease, including whether reported cases define the full spectrum of symptoms. Here we describe abnormal brain morphogenesis in ~30% of Tor1a-/- embryos. These brains contain excess neural tissue, as well as proliferative zone cytoarchitectural defects related to radial glial cell polarity and cytoskeletal organization. In cultured cells, torsinA effects the LINC complex that couples the nucleus and cytoskeleton. Here we identify that torsinA loss elevates LINC complex levels in the proliferative zone, and that genetic reduction of LINC complexes prevents abnormal Tor1a-/- brain development. These data show that homozygous loss of Tor1a affects radial glial cells via a LINC complex mediated mechanism. They also predict a semi-penetrant component to recessive TOR1A disease where morphological abnormalities arise early in embryonic neurodevelopment.

Authors

Beatriz Dominguez Gonzalez(1,2)
Karolien Billion(1,2)
Stef Rous(1,2)
Benjamin Pavie(1,5)
Christian Lange(3,4)
Rose Goodchild(1,2)

Organisations

VIB-KU Leuven Centre for Brain & Disease Research(1)
KU Leuven, Department of Neurosciences, Campus Gasthuisberg, 3000 Leuven, Belgium(2)
Biotechnology Center (BIOTEC)(3)
Center for Regenerative Therapies Dresden (CRTD), Technische Universität Dresden, D-01307 Dresden, Germany(4)
VIB Bio Imaging Core, Campus Gasthuisberg, 3000 Leuven, Belgium(5)

Presenting author

Beatriz Dominguez Gonzalez, Doctoral Researcher, VIB-KU Leuven Centre for Brain & Disease Research
beatriz.gonzalez@kuleuven.vib.be
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