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01.12.2018 | Case report | Ausgabe 1/2018 Open Access

BMC Medical Genetics 1/2018

Identification and characterization of a novel 43-bp deletion mutation of the ATP7B gene in a Chinese patient with Wilson’s disease: a case report

Zeitschrift:
BMC Medical Genetics > Ausgabe 1/2018
Autoren:
Gang Liu, Dingyuan Ma, Jian Cheng, Jingjing Zhang, Chunyu Luo, Yun Sun, Ping Hu, Yuguo Wang, Tao Jiang, Zhengfeng Xu
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1186/​s12881-018-0567-z) contains supplementary material, which is available to authorized users.

Abstract

Background

Wilson’s disease (WD) is an autosomal recessive disorder characterized by copper accumulation. ATP7B gene mutations lead to ATP7B protein dysfunction, which in turn causes Wilson’s disease.

Case presentation

We describe a male case of Wilson’s disease diagnosed at 10 years after routine biochemical test that showed low serum ceruloplasmin levels and Kayser–Fleischer rings in both corneas. Analysis of the ATP7B gene revealed compound heterozygous mutations in the proband, including the reported c.3517G > A mutation and a novel c.532_574del mutation. The c.532_574del mutation covered a 43-bp region in exon 2, and resulted in a frameshift mutation (p.Leu178PhefsX10). By base sequence analysis, two microhomologies (TCTCA) were observed on both deletion breakpoints in the ATP7B gene. Meanwhile, the presence of some sequence motifs associated with DNA breakage near the deletion region promoted DNA strand break.

Conclusions

By comparison, a replication-based mechanism named fork stalling and template switching/ microhomology-mediated break-induced replication (FoSTeS/MMBIR) was used to explain the formation of this novel deletion mutation.
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