Exonic duplication of the OTC gene by a complex rearrangement that likely occurred via a replication-based mechanism: A case report

研究成果: ジャーナルへの寄稿学術論文査読

3 被引用数 (Scopus)

抄録

Background: Ornithine transcarbamylase deficiency (OTCD) is an X-linked recessive disorder involving a defect in the urea cycle caused by OTC gene mutations. Although a total of 417 disease-causing mutations in OTC have been reported, structural abnormalities in this gene are rare. We here describe a female OTCD case caused by an exonic duplication of the OTC gene (exons 1-6). Case presentation: A 23-year-old woman with late-onset OTCD diagnosed by biochemical testing was subjected to subsequent genetic testing. Sanger sequencing revealed no pathogenic mutation throughout the coding exons of the OTC gene, but multiplex ligation-dependent probe amplification (MLPA) revealed duplication of exons 1-6. Further genetic analyses revealed an inversion of duplicated exon 1 and a tandem duplication of exons 2-6. Each of the junctions of the inversion harbored a microhomology and non-templated microinsertion, respectively, suggesting a replication-based mechanism. The duplication was also of de novo origin but segregation analysis indicated that it took place in the paternal chromosome. Conclusion: We report the first OTCD case harboring an exonic duplication in the OTC gene. The functional defects caused by this anomaly were determined via structural analysis of its complex rearrangements.

本文言語英語
論文番号210
ジャーナルBMC Medical Genetics
19
1
DOI
出版ステータス出版済み - 12-12-2018

All Science Journal Classification (ASJC) codes

  • 遺伝学
  • 遺伝学(臨床)

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