title: Meiosis of trisomy 21 in the human pachytene oocyte. Behaviour of the supernumerary chromosome, identification of chromomere sequence and numerous sub-bands.
abstract: Association modalities of the three 21 chromosomes were studied during pachytene in three trisomy 21 fetuses whose chromosomal constitution was identified following amniocentesis. -- Three classes of images were observed: a trivalent, a trivalent presenting an important asynaptic region of the long arm, and a bivalent accompanied by a univalent. Such behaviour is analagous to that observed in all trisomic organisms. -- We have been able to establish the sequence of chromomeres, whose number varies from 9 to 14 according to the state of contraction in the 21 chromosome. Each band is thus subdivided into several sub-bands: at maximal elongation 2 sub-bands for band p11, 4 for q21 and 3 for q222. In addition, the interchromomeric clear bands q221 and q223 are also subdivided by the presence of a very small chromomere. In this way, the G-bands visible on mitotic metaphase chromosomes result from the compression together of several chromomeres whose individuality disappears as chromosomal condensation increases with progression of prophase.
mesh_terms: D002904:Chromosomes, Human, 21-22 and Y; D003434:Crossing Over, Genetic; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D005333:Fetus / Q000166:cytology; D006801:Humans; D008540:Meiosis; D009865:Oocytes / Q000166:cytology*; D010063:Ovum / Q000166:cytology*; D013194:Staining and Labeling