Phenotype and genotype in 103 patients with tricho-rhino-phalangeal syndrome.

Maas, Saskia M; Shaw, Adam C; Bikker, Hennie; Lüdecke, Hermann-Josef; van der Tuin, Karin; Badura-Stronka, Magdalena; Belligni, Elga; Biamino, Elisa; Bonati, Maria Teresa; Carvalho, Daniel R; Cobben, JanMaarten; de Man, Stella A; Den Hollander, Nicolette S; Di Donato, Nataliya; Garavelli, Livia; Grønborg, Sabine; Herkert, Johanna C; Hoogeboom, A Jeannette M; Jamsheer, Aleksander; Latos-Bielenska, Anna; ... (2015). Phenotype and genotype in 103 patients with tricho-rhino-phalangeal syndrome. European journal of medical genetics, 58(5), pp. 279-292. Elsevier 10.1016/j.ejmg.2015.03.002

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Tricho-rhino-phalangeal syndrome (TRPS) is characterized by craniofacial and skeletal abnormalities, and subdivided in TRPS I, caused by mutations in TRPS1, and TRPS II, caused by a contiguous gene deletion affecting (amongst others) TRPS1 and EXT1. We performed a collaborative international study to delineate phenotype, natural history, variability, and genotype-phenotype correlations in more detail. We gathered information on 103 cytogenetically or molecularly confirmed affected individuals. TRPS I was present in 85 individuals (22 missense mutations, 62 other mutations), TRPS II in 14, and in 5 it remained uncertain whether TRPS1 was partially or completely deleted. Main features defining the facial phenotype include fine and sparse hair, thick and broad eyebrows, especially the medial portion, a broad nasal ridge and tip, underdeveloped nasal alae, and a broad columella. The facial manifestations in patients with TRPS I and TRPS II do not show a significant difference. In the limbs the main findings are short hands and feet, hypermobility, and a tendency for isolated metacarpals and metatarsals to be shortened. Nails of fingers and toes are typically thin and dystrophic. The radiological hallmark are the cone-shaped epiphyses and in TRPS II multiple exostoses. Osteopenia is common in both, as is reduced linear growth, both prenatally and postnatally. Variability for all findings, also within a single family, can be marked. Morbidity mostly concerns joint problems, manifesting in increased or decreased mobility, pain and in a minority an increased fracture rate. The hips can be markedly affected at a (very) young age. Intellectual disability is uncommon in TRPS I and, if present, usually mild. In TRPS II intellectual disability is present in most but not all, and again typically mild to moderate in severity. Missense mutations are located exclusively in exon 6 and 7 of TRPS1. Other mutations are located anywhere in exons 4-7. Whole gene deletions are common but have variable breakpoints. Most of the phenotype in patients with TRPS II is explained by the deletion of TRPS1 and EXT1, but haploinsufficiency of RAD21 is also likely to contribute. Genotype-phenotype studies showed that mutations located in exon 6 may have somewhat more pronounced facial characteristics and more marked shortening of hands and feet compared to mutations located elsewhere in TRPS1, but numbers are too small to allow firm conclusions.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Forschungsgruppe Humangenetik
04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine

UniBE Contributor:

Rieubland, Claudine

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1878-0849

Publisher:

Elsevier

Language:

English

Submitter:

André Schaller

Date Deposited:

08 Apr 2016 13:20

Last Modified:

14 Dec 2018 09:42

Publisher DOI:

10.1016/j.ejmg.2015.03.002

PubMed ID:

25792522

Uncontrolled Keywords:

EXT1; Genotype; Langer-Giedion syndrome; Multiple exostoses; Natural history; Phenotype; RAD21; Review; TRPS; TRPS1; Tricho-rhino-phalangeal syndrome

BORIS DOI:

10.7892/boris.79346

URI:

https://boris.unibe.ch/id/eprint/79346

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