Identification of a novel ZNF469 mutation in a large family with Ehlers-Danlos phenotype.
PMID 23010198 | DOI 10.1016/j.gene.2012.09.022 · Gene · 2012 · View on PubMed ↗
Brittle cornea syndrome (BCS) is a genetically heterogeneous disorder characterized by extreme corneal fragility and thinning, which may lead to spontaneous or trauma-induced corneal rupture. BCS-1 and BCS-2 are caused by recessive mutations in ZNF469 and PRDM5, respectively. Both genes play a role in the regulatory pathway of corneal development and maintenance. We report a consanguineous family with five patients affected with the cardinal ocular features of BCS and significant musculoskeletal findings primarily in the form of joint hypermobility and severe kyphoscoliosis. The patients had thin velvety skin, hallux valgus, variable sensorineural hearing loss and arachnodactyly. Interestingly, one of the patients additionally had phenylketonuria and showed a milder ophthalmological and musculoskeletal phenotype than his affected siblings. The urinary pyridinoline and deoxypyridinoline concentrations and their ratios were mildly elevated indicating increased bone-collagen turnover. A novel homozygous 14 bp duplication in exon 2 of ZNF469 (c.8817_8830dup) was uncovered by direct sequencing. This family highlights the phenotypic overlap between BCS and Ehlers-Danlos syndrome.
Validated evidence
| Type | Entity | Source evidence | Confidence | Extractor |
|---|---|---|---|---|
| gene | ZNF469 | “Identification of a novel ZNF469 mutation in a large family with Ehlers-Danlos phenotype.” | 0.98 | hgnc_dict_v1 |
| gene | PRDM5 | “BCS-1 and BCS-2 are caused by recessive mutations in ZNF469 and PRDM5, respectively.” | 0.98 | hgnc_dict_v1 |
| phenotype | hearing loss | “The patients had thin velvety skin, hallux valgus, variable sensorineural hearing loss and arachnodactyly.” | 0.98 | phenotype_alias_lexicon_v2 |
| phenotype | phenylketonuria | “Interestingly, one of the patients additionally had phenylketonuria and showed a milder ophthalmological and musculoskeletal phenotype than his affected siblings.” | 0.98 | phenotype_alias_lexicon_v2 |
| phenotype | Ehlers-Danlos syndrome | “This family highlights the phenotypic overlap between BCS and Ehlers-Danlos syndrome.” | 0.98 | phenotype_alias_lexicon_v2 |
| population | Population | “We report a consanguineous family with five patients affected with the cardinal ocular features of BCS and significant musculoskeletal findings primarily in the form of joint hypermobility and severe kyphoscoliosis.” | 0.80 | saudi_context_rules_v1 |
| variant | c.8817_8830dup | “A novel homozygous 14 bp duplication in exon 2 of ZNF469 (c.8817_8830dup) was uncovered by direct sequencing.” | 0.95 | hgvs_regex_v1 |