Clinical and radiological characteristics of two patients with osteoporosis–pseudoglioma syndrome caused by a pathogenic homozygotic variant in the LRP5 gene
- Authors: Merkuryeva E.S.1, Markova T.V.1, Kenis V.M.2, Kadyshev V.V.1, Nagornova T.S.1, Noskova E.V.3, Dadali E.L.1
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Affiliations:
- Research Centre for Medical Genetics
- H. Turner National Medical Research Center for Children’s Orthopedics and Trauma Surgery
- Chelyabinsk Regional Children’s Clinical Hospital
- Issue: Vol 11, No 4 (2023)
- Pages: 547-556
- Section: Clinical cases
- URL: https://bakhtiniada.ru/turner/article/view/251913
- DOI: https://doi.org/10.17816/PTORS607380
- ID: 251913
Cite item
Abstract
BACKGROUND: Osteoporosis–pseudoglioma syndrome (OMIM #259770) is an ultrarare autosomal recessive disease characterized by congenital or infant blindness, severe osteoporosis, and spontaneous bone fractures. The syndrome is caused by pathogenic variants in the LRP5 gene, which encodes a protein involved in the transmission of signals in the Wnt/β-catenin signaling pathway. To date, 77 pathogenic variants associated with osteoporosis–pseudoglioma syndrome have been registered in LRP5, mainly localized in the second and third beta-propeller domains of the protein, which have a high affinity for the Wnt ligand.
CLINICAL CASES: Two siblings presented with clinical manifestations of osteoporosis–pseudoglioma syndrome caused by a pathogenic homozygous missense variant c.1481G>A (p.Arg494Gln) in LRP5. The phenotype of the patients was characterized by a combination of blindness, low bone-mineral density, short stature, and fractures and deformities of long tubular bones and the spine.
DISCUSSION: The rarity of the osteoporosis–pseudoglioma syndrome and the similarity of the clinical manifestations of various skeletal disorders and their genetic heterogeneity lead to a late diagnosis and treatment.
CONCLUSIONS: We are the first to present the clinical, radiological, and genetic characteristics of two siblings with clinical manifestations of osteoporosis–pseudoglioma syndrome. Its rarity necessitates detailed description of the clinical and genetic characteristics of this syndrome. Molecular genetic testing is an important part of a comprehensive diagnosis.
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##article.viewOnOriginalSite##About the authors
Elena S. Merkuryeva
Research Centre for Medical Genetics
Email: elena.merkureva@gmail.com
ORCID iD: 0000-0001-6902-253X
MD, PhD student, geneticist
Russian Federation, MoscowTatiana V. Markova
Research Centre for Medical Genetics
Email: markova@med-gen.ru
ORCID iD: 0000-0002-2672-6294
SPIN-code: 4707-9184
MD, PhD, Cand. Sci. (Med.)
Russian Federation, MoscowVladimir M. Kenis
H. Turner National Medical Research Center for Children’s Orthopedics and Trauma Surgery
Author for correspondence.
Email: kenis@mail.ru
ORCID iD: 0000-0002-7651-8485
SPIN-code: 5597-8832
MD, PhD, Dr. Sci. (Med.), Professor
Russian Federation, Saint PetersburgVitaly V. Kadyshev
Research Centre for Medical Genetics
Email: vvh.kad@gmail.com
ORCID iD: 0000-0001-7765-3307
SPIN-code: 4015-1309
MD, PhD, Cand. Sci. (Med.), Assistant Professor
Russian Federation, MoscowTatiana S. Nagornova
Research Centre for Medical Genetics
Email: nagornova@med-gen.ru
ORCID iD: 0000-0003-4527-4518
SPIN-code: 6032-2080
MD, laboratory geneticist
Russian Federation, MoscowElena V. Noskova
Chelyabinsk Regional Children’s Clinical Hospital
Email: noskovaev89@gmail.com
MD, geneticist
Russian Federation, ChelyabinskElena L. Dadali
Research Centre for Medical Genetics
Email: genclinic@yandex.ru
ORCID iD: 0000-0001-5602-2805
SPIN-code: 3747-7880
MD, PhD, Dr. Sci. (Med.), Professor
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