Abstract:
:We performed a molecular study with 21 microsatellites on a sample of 82 trisomy 13 conceptuses, the largest number of cases studied to date. The parental origin was determined in every case and in 89% the extra chromosome 13 was of maternal origin with an almost equal number of maternal MI and MII errors. The latter finding is unique among human autosomal trisomies, where maternal MI (trisomies 15, 16, 21, 22) or MII (trisomy 18) errors dominate. Of the nine paternally derived cases five were of MII origin but none arose from MI errors. There was some evidence for elevated maternal age in cases with maternal meiotic origin for liveborn infants. Maternal and paternal ages were elevated in cases with paternal meiotic origin. This is in contrast to results from a similar study of non-disjunction of trisomy 21 where paternal but not maternal age was elevated. We find clear evidence for reduced recombination in both maternal MI and MII errors and the former is associated with a significant number of tetrads (33%) that are nullichiasmate, which do not appear to be a feature of normal chromosome 13 meiosis. This study supports the evidence for subtle chromosome-specific influences on the mechanisms that determine non-disjunction of human chromosomes, consistent with the diversity of findings for other trisomies.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Bugge M,Collins A,Hertz JM,Eiberg H,Lundsteen C,Brandt CA,Bak M,Hansen C,Delozier CD,Lespinasse J,Tranebjaerg L,Hahnemann JM,Rasmussen K,Bruun-Petersen G,Duprez L,Tommerup N,Petersen MBdoi
10.1093/hmg/ddm148subject
Has Abstractpub_date
2007-08-15 00:00:00pages
2004-10issue
16eissn
0964-6906issn
1460-2083pii
ddm148journal_volume
16pub_type
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