Euchromatic variant 16p+. Implications in prenatal diagnosis.
PRENATAL DIAGNOSIS(2006)
摘要
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. Copyright (C) 2006 John Wiley & Sons, Ltd.
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关键词
euchromatic variant 16p+,euchromatic,heteromorphism,fluorescence in situ hybridisation (FISH),prenatal diagnosis
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