Sclerosteosis

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Sclerosteosis is an autosomal recessive disorder characterized by bone overgrowth. It was first described in 1958 [1] [2] but given the current name in 1967. [3] Excessive bone formation is most prominent in the skull, mandible and tubular bones. [1] It can cause facial distortion and syndactyly. [1] Increased intracranial pressure can cause sudden death in patients. [1] It is a rare disorder that is most prominent in the Afrikaner population in South Africa (40 patients), but there have also been cases of American and Brazilian families. [1] Recently, porcupine inhibition has emerged as a promising pharmacological treatment for severe sclerosteosis pathologies, and is currently in preclinical research. [4]

Contents

Cause

Sclerosteosis is caused by mutations in the SOST gene that encodes the sclerostin protein. [5] The sclerostin protein is necessary in inhibiting the Wnt signaling pathway. Wnt signalling results in increased osteoblast activity and RANKL synthesis. Sclerostin therefore increases bone formation by indirectly inhibiting RANKL synthesis and thus osteoclast activation.

See also

References

  1. 1 2 3 4 5 Balemans W, Ebeling M, Patel N, Van Hul E, Olson P, Dioszegi M, Lacza C, Wuyts W, Van Den Ende J, Willems P, Paes-Alves AF, Hill S, Bueno M, Ramos FJ, Tacconi P, Dikkers FG, Stratakis C, Lindpaintner K, Vickery B, Foernzler D, Van Hul W (Mar 2001). "Increased bone density in sclerosteosis is due to the deficiency of a novel secreted protein (SOST)". Human Molecular Genetics. 10 (5): 537–43. doi: 10.1093/hmg/10.5.537 . PMID   11181578.
  2. Truswell AS (May 1958). "Osteopetrosis with syndactyly; a morphological variant of Albers-Schönberg's disease". The Journal of Bone and Joint Surgery. British Volume. 40-B (2): 209–18. PMID   13539104.
  3. Balemans W, Patel N, Ebeling M, Van Hul E, Wuyts W, Lacza C, Dioszegi M, Dikkers FG, Hildering P, Willems PJ, Verheij JB, Lindpaintner K, Vickery B, Foernzler D, Van Hul W (Feb 2002). "Identification of a 52 kb deletion downstream of the SOST gene in patients with van Buchem disease". Journal of Medical Genetics. 39 (2): 91–7. doi:10.1136/jmg.39.2.91. PMC   1735035 . PMID   11836356.
  4. Dreyer, Timothy J.; Keen, Jacob A. C.; Wells, Leah M.; Hopkinson, Mark; Orriss, Isabel R.; Holdsworth, Gill; Pitsillides, Andrew A.; Roberts, Scott J. (2025-04-07). "Porcupine inhibition is a promising pharmacological treatment for severe sclerosteosis pathologies". Bone Research. 13 (1): 44. doi:10.1038/s41413-025-00406-3. ISSN   2095-6231.
  5. Sebastian A, Loots GG (March 2018). "Genetics of Sost/SOST in sclerosteosis and van Buchem disease animal models". Metabolism. 80: 38–47. doi: 10.1016/j.metabol.2017.10.005 . PMID   29080811.