López Pajares I, Villa O, Salido M, Mori MA, Gonzalez A, Lapunzina P, De Torres ML, Vallcorba I, Palomares M, Fernández L, Delicado A. Euchromatic variant 16p+. Implications in prenatal diagnosis.
Prenat Diagn 2006;
26:535-8. [PMID:
16634122 DOI:
10.1002/pd.1454]
[Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND
Euchromatic imbalances at the cytogenetic level are usually associated with phenotypic consequences. Among the exceptions are euchromatic variants of chromosome 16 (16p+) with normal phenotype. There is a growing list of euchromatic duplications and deletions involving both G-positive and G-negative bands that seem to be phenotypically neutral, but these euchromatic variants are rare.
OBJECTIVE
The aim of this report is to describe a new familial case of euchromatic variant 16p+ and to emphasise the misinterpretation of these rare euchromatic variants particularly when ascertained at prenatal diagnosis.
METHODS AND RESULTS
Fluorescence in situ hybridisation with clone RP11-261A7 showed an amplified signal in the larger chromosome 16. This clone contains FLJ43855 gene, similar to sodium- and chloride-dependent creatine transporter.
CONCLUSION
So, this 16p+ variant that involves amplification of pseudogenetic sequences is considered a polymorphism in normal individuals.
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