A novel mutation in PLS3 causes extremely rare X-linked osteogenesis imperfecta

Area of Science:

• Genetics
• Molecular Biology
• Pediatrics

Background:

• Osteogenesis imperfecta (OI) is a group of genetic disorders characterized by bone fragility.
• X-linked OI caused by PLS3 mutations is exceptionally rare, with limited genotype-phenotype data.
• Understanding rare genetic variants is crucial for diagnosing and managing inherited bone diseases.

Observation:

• A novel frameshift mutation (c.1106_1107insGAAA; p.Phe369Leufs*5) in the PLS3 gene was identified in two brothers with OI.
• The mutation was maternally inherited, though the mother exhibited normal bone mineral density.
• Affected individuals presented with bone fractures, low bone mineral density, and blue sclerae.

Findings:

• Next-generation sequencing (NGS) and Sanger sequencing confirmed the novel PLS3 mutation in patients.
• The identified mutation provides a new genetic cause for X-linked osteogenesis imperfecta.
• Zoledronic acid treatment improved bone mineral density and vertebral bone structure in the proband.

Implications:

• This research expands the known genetic spectrum of osteogenesis imperfecta.
• Early diagnosis and targeted treatment can improve outcomes for patients with rare OI.
• Further research into PLS3 mutations will enhance understanding of X-linked OI pathogenesis.