TARS2 c.470 C > G is a chinese-specific founder mutation in three unrelated families with mitochondrial encephalomyopathy

Autor: Shujie Zhang, Haisong Qin, Qingming Wang, Yingfei Wang, Yanhui Liu, Qi Yang, Jingsi Luo, Zailong Qin, Xiang Ji, Lijuan Kan, Guoxing Geng, Jing Huang, Shengkai Wei, Qiuli Chen, Yiping Shen, Haiming Yuan, Baoling Lai
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Orphanet Journal of Rare Diseases, Vol 19, Iss 1, Pp 1-6 (2024)
Druh dokumentu: article
ISSN: 1750-1172
DOI: 10.1186/s13023-024-03365-w
Popis: Abstract Biallelic pathogenic variants in TARS2 lead to combined oxidative phosphorylation deficiency, subtype 21 (COXPD21, MIM #615918), which is a rare mitochondrial encephalomyopathy (ME) characterized by early-onset severe axial hypotonia, limb hypertonia, psychomotor developmental delay, epilepsy and brain anomalies. To date, approximately 28 individuals with COXPD21 and 28 TARS2 variants have been identified. In this study, we reported additional four individuals from three unrelated Chinese families with mitochondrial encephalomyopathy caused by pathogenic variants in TARS2, and described the novel clinical phenotypes and genotypic information. In addition to two novel variants (c.512G > A, p.Arg171Lys; c.988dup, p.Arg330Lysfs*4), one previously reported variant (c.470 C > G, p.Thr157Arg) recurred in six Chinese individuals with COXPD21 but was not present in populations of other races. Our findings expanded the mutation spectrum of TARS2 and confirmed that c.470 C > G is a Chinese-specific founder mutation. The novel phenotypes, including reduced fetal movement, eye anomalies and sleep irregularities, observed in our patients enriched the clinical characteristics of COXPD21.
Databáze: Directory of Open Access Journals
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