A homozygous loss-of-function CAMK2A mutation causes growth delay, frequent seizures and severe intellectual disability

作者：Chia Poh Hui^*; Zhong Franklin Lei; Niwa Shinsuke; Bonnard Carine; Utami Kagistia Hana; Zhang Ruizhu; Lee Hane; Eskin Ascia; Nelson Stanley F; Xie William H; Al Tawalbeh Samah; El Khateeb Mohammad; Shboul Mohammad; Pouladi Mahmoud A; Al Raqad Mohammad; Reversade Bruno^*

来源：eLife, 2018, 7: e32451.

DOI：10.7554/eLife.32451

Calcium/calmodulin-dependent protein kinase II (CAMK2) plays fundamental roles in synaptic plasticity that underlies learning and memory. Here, we describe a new recessive neurodevelopmental syndrome with global developmental delay, seizures and intellectual disability. Using linkage analysis and exome sequencing, we found that this disease maps to chromosome 5q31.1-q34 and is caused by a biallelic germline mutation in CAMK2A. The missense mutation, p. His477Tyr is located in the CAMK2A association domain that is critical for its function and localization. Biochemically, the p.His477Tyr mutant is defective in self-oligomerization and unable to assemble into the multimeric holoenzyme.ln vivo, CAMK2A(H477Y) failed to rescue neuronal defects in C. elegans lacking unc-43, the ortholog of human CAMK2A. In vitro, neurons derived from patient iPSCs displayed profound synaptic defects. Together, our data demonstrate that a recessive germline mutation in CAMK2A leads to neurodevelopmental defects in humans and suggest that dysfunctional CAMK2 paralogs may contribute to other neurological disorders.

• 出版日期2018-5-22
• 单位河北医科大学