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Case Reports
. 2007 Mar-Apr;50(2):94-102.
doi: 10.1016/j.ejmg.2006.11.001. Epub 2006 Nov 23.

Five cases of supernumerary small ring chromosomes 1: heterogeneity and genotype-phenotype correlation

Laura Bernardini  1 , Anna Capalbo, Maria Gabriella D'Avanzo, Isabella Torrente, Paola Grammatico, Domenico Dell'Edera, Denise Pontes Cavalcanti, Antonio Novelli, Bruno Dallapiccola
Affiliations
Case Reports

Five cases of supernumerary small ring chromosomes 1: heterogeneity and genotype-phenotype correlation

Laura Bernardini et al. Eur J Med Genet. 2007 Mar-Apr.

Abstract

Genetic counselling of patients with small supernumerary ring chromosomes (sSRCs) can be difficult, especially in prenatal testing, due to the complexity in establishing a karyotype-phenotype correlation. In fact, it has been estimated that about 10% of extra ring(1) chromosomes are associated with an unremarkable phenotype. We report on five new cases of extra ring chromosomes(1) manifesting different clinical outcome. One case was familial, segregating from a mother with mosaic karyotype, while the others were de novo. Ring chromosomes were characterised by FISH. In three subjects the involvement of the same euchromatic 1p region was demonstrated. Present observations corroborate previous results and provide some insight into the identification of the harmless ring(1) structures.

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