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Updated: Feb 10, 2026

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Published on: June 12, 2017
Osteogenesis Imperfecta with a gross deletion including the COL1A1 gene, induced by Alu-driven microhomology-mediated
Kenichi Yamamoto1,2, Hirofumi Nakayama2,3, Yusaku Ito2
1Laboratory of Children's health and Genetics, Division of Health Sciences, The University of Osaka Graduate School of Medicine, Yamadaoka 1-7, Suita, 565-0871, Japan.
Abstract:
Osteogenesis Imperfecta (OI) is a rare hereditary brittle bone disorder typically caused by COL1A1 and COL1A2 variants impairing type I collagen. However, gross deletions involving COL1A1 are uncommon. Here, we report a family with type I OI harboring a 101-kbp deletion encompassing COL1A1, identified through whole genome analysis. Affected individuals presented mild phenotypes. Breakpoint analysis revealed a 5-bp microhomology-mediated end joining involving an Alu element. This report expands the understanding of genetic mechanisms underlying OI.
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