Citation

Wang R, Han S, Liu H, Khan A, Xiaerbati H, Yu X, Huang J, Zhang X. Front. Genet. 2019; 10: e1060.

Affiliation

McKusick-Zhang Center for Genetic Medicine, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China.

Copyright

(Copyright © 2019, Frontiers Research Foundation)

DOI

10.3389/fgene.2019.01060

PMID

31737043

PMCID

PMC6830114

Abstract

Telomere maintenance 2 (TELO2)-interacting protein 2 (TTI2) interacts with TTI1 and TELO2 to form the Triple T complex, which is required for various cellular processes, including the double-strand DNA break response, nonsense-mediated mRNA decay, and telomerase assembly. Herein, we identified compound heterozygous mutations in TTI2 using whole-exome sequencing (WES) in a Chinese family with a recessive inheritance pattern of syndromic intellectual disability. The patients displayed intellectual disability, aggressive and self-injurious behaviors, facial dysmorphic features, microcephaly, and skeletal anomalies. In addition, one patient showed cerebral white matter abnormality. Maternal novel indel mutation resulted in a premature termination codon and nonsense-mediated mRNA decay. Paternal reported c.1100C > T mutation changed the highly conserved proline to leucine that located in the DUF2454 domain. Immunoblotting experiments showed significantly decreased TTI2, TTI1, and TELO2 in the patients' lymphocytes. These results indicated that TTI2 loss-of-function mutations might cause an autosomal-recessive syndromic intellectual disability by affecting the Triple T complex. Our report expands the genetic causes of syndromic intellectual disability in the Chinese population.

Copyright © 2019 Wang, Han, Liu, Khan, Xiaerbati, Yu, Huang and Zhang.

Language: en

Keywords

TTI2; intellectual disability; pathogenic mutations; triple T complex; whole-exome sequencing