کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2814133 1569510 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Discordant phenotype in monozygotic twins with mosaic trisomy 12p in lymphocytes
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی ژنتیک
پیش نمایش صفحه اول مقاله
Discordant phenotype in monozygotic twins with mosaic trisomy 12p in lymphocytes
چکیده انگلیسی

We report on monochorionic diamniotic male twins discordant for the trisomy 12p syndrome. Trisomy 12p mosaicism with a supernumerary der(12)(pter > q12) was detected in approximately 50% of lymphocytes in both children. Fluorescence in situ hybridisation (FISH) revealed a high grade mosaicism of approximately 77% trisomy 12p cells in buccal smear and 85% in hair follicles in the affected twin, while in the normal developing brother an additional 12p chromosome fragment could not be detected in those tissues. Instead, in 3% of buccal smear and hair follicle cells a minute supernumerary marker chromosome comprising central portions of chromosome 12 was observed. Trisomy 12p mosaicism, confined to the lymphocytes of the unaffected twin, may be due to prenatal twin-to-twin transfusion, explaining the conspicuously discordant clinical phenotype. We discuss the possible sequence of events leading to the cytogenetic findings and compare the clinical phenotype presented in the affected twin with other cases of trisomy 12p and tetrasomy 12p (Pallister-Killian syndrome).


► Monozygotic twins with mosaic trisomy 12p in lymphocytes and discordant phenotype.
► High grade mosaicism of trisomy 12p cells in the affected twin.
► Low grade mosaicism of a minute supernumerary marker in the normal developing twin.
► Lymphocytes analysis is not adequate for mosaicism detection in monocygotic twins.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Medical Genetics - Volume 55, Issues 8–9, August–September 2012, Pages 480–484
نویسندگان
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