Severe Osteoporosis in an Adult Subject with RNU4-2 Gene Mutation Severe Osteoporosis in an Adult Subject with RNU4-2 Gene Mutation

Recent studies have shown that RNU4-2 pathogenic gene variants are among the most frequent causes of monogenic neurodevelopmental disorders. We present an adult patient with a pathogenic variant in the RNU4-2 gene associated with the presence of severe osteoporosis. A 19-year-old male diagnosed with...

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Veröffentlicht in:	Calcified tissue international Jg. 116; H. 1; S. 40
Hauptverfasser:	Peñafiel-Sam, Joshua, Valenzuela, Irene, Peris, Pilar
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York Springer US 17.02.2025 Springer Nature B.V
Schlagworte:	Biochemistry Biomedical and Life Sciences Bone Density - genetics Bone diseases Bone mass Bone turnover Case Reports Cell Biology Dual energy X-ray absorptiometry Endocrinology Femur Fractures Hearing loss Humans Humerus Life Sciences Male Microencephaly Mutation Nephrotic Syndrome - complications Nephrotic Syndrome - genetics Neurodevelopmental disorders Orthopedics Osteoporosis Osteoporosis - genetics Point mutation Scoliosis Seizures Spine (lumbar) Thorax Young Adult Zoledronic acid Osteoporosis Spliceosomopathies Fracture ReNU syndrome RNU4-2
ISSN:	0171-967X, 1432-0827, 1432-0827
Online-Zugang:	Volltext
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Zusammenfassung:	Recent studies have shown that RNU4-2 pathogenic gene variants are among the most frequent causes of monogenic neurodevelopmental disorders. We present an adult patient with a pathogenic variant in the RNU4-2 gene associated with the presence of severe osteoporosis. A 19-year-old male diagnosed with ReNU syndrome after years of extensive evaluation for a history of developmental delay, seizures, and hearing loss, was referred to our department for osteoporosis evaluation, presenting spontaneous humeral fracture at age 16, and a low-impact fibular fracture at age 8. Physical examination showed microcephaly, hypotelorism, thoracic asymmetry, and mild scoliosis, without bone tenderness. Extensive laboratory investigations, including hormonal study, excluded additional secondary causes of osteoporosis. Bone turnover markers were increased and dual-energy X-ray absorptiometry confirmed the presence of low bone mass (with a Z -score of − 1.9 in the lumbar spine, − 3.5 in the femoral neck, and − 3.7 in the total femur). Therapy with zoledronate acid was indicated. These observations suggests that ReNU syndrome includes bone disease in the clinical manifestations. Subjects with RNU4.2 mutations may present associated osteoporosis, indicating the need to evaluate the presence of bone disease in these individuals.
Bibliographie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 ObjectType-Case Study-2 ObjectType-Feature-4 content type line 23 ObjectType-Report-1 ObjectType-Article-3
ISSN:	0171-967X 1432-0827 1432-0827
DOI:	10.1007/s00223-025-01351-3