Clinical diagnosis, treatment, and genetic analysis of adolescent onset holocarboxylase synthetase deficiency and cobalamin C deficiency: A case report and literature review

Ye Ren , Hongxing Dang , Yueqiang Fu , Chengjun Liu , Jing Li , Jinhua Cai
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Abstract

Background

Holocarboxylase Synthetase Deficiency (HCSD) is an uncommon autosomal recessive genetic disorder that manifests with symptoms such as metabolic acidosis, lethargy, hypotonia, seizures, and persistent rashes, typically emerging during infancy. The HLCS gene has been identified as the source of pathogenic mutations associated with this condition. Cobalamin C (cblC) deficiency is another rare autosomal recessive disorder resulting from defects in cobalamin metabolism, attributable to mutations in the MMACHC gene. This disorder often leads to methylmalonic aciduria and homocystinuria and is classified into early-onset and late-onset types. The late-onset type is characterized by acute or chronic progressive neurological symptoms and behavioral disturbances. To date, there have been no documented cases worldwide of individuals diagnosed with both HCSD and cobalamin C deficiency.

Case presentation

This report details the case of an 11-year-and-9-month-old female patient from China who presented with symptoms including vomiting, altered consciousness, and a rash. Laboratory evaluations indicated the presence of metabolic acidosis, methylmalonic aciduria, and homocystinuria. Genetic analysis revealed mutations in the MMACHC gene: c.482G > A (p.R161Q) and c.567dup (p.I190Yfs∗13). Additionally, two previously unreported mutations in the HLCS gene, c.1922G > T (p.G641V) and c.1754C > T (p.P585L), were identified. She was diagnosed with Holocarboxylase Synthetase Deficiency and Cobalamin C deficiency. The child showed significant improvement following treatment with hydroxocobalamin, betaine, and biotin.

Conclusion

This article reports a case of adolescent onset HCSD and cobalamin C deficiency. Treatment with hydroxocobalamin, betaine, and biotin is effective. Two novel mutations in the HLCS gene causative for HCSD have been reported, providing a broader foundation for mutational screening and offering insights into the diagnosis and treatment of similar disorders.
青少年发作的全新羧化酶合成酶缺乏症和钴胺素C缺乏症的临床诊断、治疗和遗传分析:1例报告并文献复习
背景:全新羧化酶合成酶缺乏症(HCSD)是一种罕见的常染色体隐性遗传疾病,其症状表现为代谢性酸中毒、嗜睡、低血压、癫痫发作和持续性皮疹,通常出现在婴儿期。HLCS基因已被确定为与此病相关的致病性突变的来源。钴胺素C (cblC)缺乏是另一种罕见的常染色体隐性遗传病,由钴胺素代谢缺陷引起,可归因于MMACHC基因突变。这种疾病常导致甲基丙二酸尿和同型半胱氨酸尿,分为早发型和晚发型。迟发型的特点是急性或慢性进行性神经症状和行为障碍。迄今为止,世界范围内还没有同时诊断为HCSD和钴胺素C缺乏症的病例。本报告详细介绍了一名11岁零9个月大的中国女性患者,其症状包括呕吐、意识改变和皮疹。实验室评估显示存在代谢性酸中毒、甲基丙二酸尿和同型半胱氨酸尿。遗传分析显示MMACHC基因突变:c.482G和gt;A (p.R161Q)和c.567dup (p.r 190yfs * 13)。此外,两种先前未报道的HLCS基因突变,c.1922G >;T (p.G641V)和c.1754C >;T (p.P585L),鉴定。她被诊断为全羧化酶合成酶缺乏和钴胺素C缺乏。儿童在接受羟钴胺素、甜菜碱和生物素治疗后表现出明显的改善。结论报告1例青少年发病HCSD合并钴胺素C缺乏症。用羟钴胺素、甜菜碱和生物素治疗是有效的。据报道,导致HCSD的HLCS基因中有两个新的突变,为突变筛查提供了更广泛的基础,并为类似疾病的诊断和治疗提供了见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Metabolism open
Metabolism open Agricultural and Biological Sciences (General), Endocrinology, Endocrinology, Diabetes and Metabolism
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