1
|
Zheng Z, Yuan G, Zheng M, Lin Y, Zheng F, Jiang M, Zhu L, Fu Q. Clinical, biochemical, and genetic analysis of a Chinese Han pedigree with holocarboxylase synthetase deficiency: a case report. BMC MEDICAL GENETICS 2020; 21:155. [PMID: 32727382 PMCID: PMC7388215 DOI: 10.1186/s12881-020-01080-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 06/28/2020] [Indexed: 11/10/2022]
Abstract
BACKGROUND Holocarboxylase synthetase (HLCS) deficiency is a rare inborn disorder of biotin metabolism, which results in defects in several biotin-dependent carboxylases and presents with metabolic ketoacidosis and skin lesions. CASE PRESENTATION In this paper, we report a Chinese Han pedigree with HLCS deficiency diagnosed by using next-generation sequencing and validated with Sanger sequencing of the HLCS and BTD genes. The Chinese proband carries the common missense mutation c.1522C > T (p.Arg508Trp) in exon 9 of the HLCS gene, which generates an increased Km value for biotin. A novel frameshift mutation c.1006_1007delGA (p.Glu336Thrfs*15) in exon 6 of the HLCS gene is predicted to be deleterious through PROVEAN and MutationTaster. A novel heterozygous mutation, c.638_642delAACAC (p.His213Profs*4), in the BTD gene is also identified. CONCLUSIONS The Chinese proband carries the reported Arg508Trp variant, the novel 2-bp frameshift mutation c.1006_1007delGA (p.Glu336Thrfs*15), which expands the mutational spectrum of the HLCS gene, and the novel heterozygous mutation c.638_642delAACAC (p.His213Profs*4), which expands the mutational spectrum of the BTD gene. Furthermore, reversible hearing damage is rarely reported in patients with HLCS deficiency, which deserves further discussion.
Collapse
Affiliation(s)
- Zhenzhu Zheng
- Neonatal disease screening center, Quanzhou Children's Hospital, 700 Fengze Street, Quanzhou, 362000, Fujian Province, China
| | - Gaopin Yuan
- Neonatal disease screening center, Quanzhou Children's Hospital, 700 Fengze Street, Quanzhou, 362000, Fujian Province, China
| | - Minyan Zheng
- Neonatal disease screening center, Quanzhou Children's Hospital, 700 Fengze Street, Quanzhou, 362000, Fujian Province, China
| | - Yiming Lin
- Neonatal disease screening center, Quanzhou Children's Hospital, 700 Fengze Street, Quanzhou, 362000, Fujian Province, China
| | - Faming Zheng
- Neonatal disease screening center, Quanzhou Children's Hospital, 700 Fengze Street, Quanzhou, 362000, Fujian Province, China
| | - Mengyi Jiang
- Genuine Diagnostics Company Limited, 859 Shixiang West Road, Hangzhou, 310007, Zhejiang Province, China
| | - Lin Zhu
- Genuine Diagnostics Company Limited, 859 Shixiang West Road, Hangzhou, 310007, Zhejiang Province, China.
| | - Qingliu Fu
- Neonatal disease screening center, Quanzhou Children's Hospital, 700 Fengze Street, Quanzhou, 362000, Fujian Province, China.
| |
Collapse
|