Genotype and phenotype analysis of Taiwanese patients with osteogenesis imperfecta
Orphanet Journal of Rare Diseases 2015, 10:152 doi:10.1186/s13023-015-0370-2
The electronic version of this article is the complete one and can be found online at:http://www.ojrd.com/content/10/1/152
Received: | 28 August 2015 |
Accepted: | 22 November 2015 |
Published: | 1 December 2015 |
© 2015 Lin et al.
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Abstract
Background
Osteogenesis imperfecta (OI) is a congenital disorder characterized by increased bone fragility and low bone mass.
Methods
The presence of COL1A1 or COL1A2 mutation was investigated by direct sequencing in 72 patients with OI type I, III, or IV (27 males and 45 females; age range 0.2-62 years) from 37 unrelated families. The clinical features of these patients were also recorded.
Results
Thirty-seven COL1A1 and COL1A2 mutations were identified, including 28 COL1A1 mutations and 9COL1A2 mutations. Fifteen (41 %) were novel mutations, and twelve (32 %) were familial mutations. A review of their medical records revealed that the 72 patients could be classified into OI type I (n = 42), III (n = 5), and IV (n = 25). Twenty-nine patients had helical mutations (caused by the substitution of a glycine within the Gly-X-Y triplet domain of the triple helix), and 42 had haploinsufficiency mutations (caused by frameshift, nonsense, and splice-site mutations). Compared with haploinsufficiency, the patients with helical mutations had more severely impaired skeletal phenotypes, including shorter height, lower bone mineral density, poorer walking ability, more frequent manifestations of dentinogenesis imperfecta and scoliosis (p < 0.05).
Conclusions
Genotype and phenotype databases are expected to promote better genetic counseling and medical care of patients with OI.
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