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The production of homozy
- Publisher
- Wiley
- Copyright
- 1982 Blackwell Munksgaard
- ISSN
- 0009-9163
- eISSN
- 1399-0004
- DOI
- 10.1111/j.1399-0004.1982.tb01419.x
- Publisher site
- See Article on Publisher Site
Abstract
An 8-year-old child with a ring chromosome 7 is presented, the first female and the fourth such individual to be described. The associated anomalies were rather benign: she presented with short stature, minor skeletal alterations, and normal intelligence. The only truly striking feature was the presence of multiple large, pigmented naevi, suggestive of a hamartomatous origin, but unlike those typical of any particular syndrome. Though other ring 7 patients have had naevus flammeus, and one had cafk-au-lait spots, our proband is the first with an anomaly of chromosome 7 to have such extensive lesions. These four cases of ring 7, which show great phenotypic variation, are reviewed, and the clinical presentation of the proband is also compared with that of patients suffering from terminal, interstitial and translocation-derived 7p and 7q deletions. The formation and behaviour of ring chromosomes are discussed, as are the cytogenetic factors which may influence their phenotypic expression.
Journal
Clinical Genetics – Wiley
Published: Aug 1, 1982
Keywords: Chromosome 7 deletion; ring structure: skin lesions