HUMAN RING CHROMOSOMES NEW INSIGHTS FOR THEIR CLINICAL SIGNIFICANCE
Guilherme RS1,2, Klein E1, Hamid AB1, Bhatt S1, Volleth M3, Polityko A4, Kulpanovich A5, Dufke A6, Albrecht B7, Morlot S8, Brecevic L9, Petersen MB10, Manolakos E10, Kosyakova N1, Liehr T1*
*Corresponding Author: Thomas Liehr, Institut für Humangenetik, Kollegiengasse 10, Postfach D-07740 Jena, Germany; Tel.: +49-3641-935533; Fax: +49-3641-935582; E-mail: i8lith@mti.uni-jena.de
page: 13
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Abstract

Twenty-nine as yet unreported ring chromosomes were characterized in detail by cytogenetic and molecular techniques. For FISH (fluorescence in situ hybridization) previously published high resolution approaches such as multicolor banding (MCB), subcentromere-specific multi-color-FISH (cenM-FISH) and two to three-color-FISH applying locus-specific probes were used. Overall, ring chromosome derived from chromosomes 4 (one case), 10 (one case), 13 (five cases), 14, (three cases), 18 (two cases), 21 (eight cases), 22 (three cases), X (five cases) and Y (one case) were studied. Eight cases were detected prenatally, eight due developmental delay and dysmorphic signs, and nine in connection with infertility and/or Turner syndrome. In general, this report together with data from the literature, supports the idea that ring chromosome patients fall into two groups: group one with (severe) clinical signs and symptoms due to the ring chromosome and group two with no obvious clinical problems apart from infertility.



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