Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1987-11-17
pubmed:abstractText
Spontaneous abortions were studied by analyzing chromosomes directly from chorionic villi. The frequency and the type of anomalies detected among 140 abortuses are in good agreement with those observed by others using conventional tissue cultures. Abnormal karyotypes were found in 48.6% of the cases. Trisomy predominated (66.2%), followed by polyploidy (22.1%), monosomy X (7.4%), and structural anomalies (4.4%). Among the trisomies, the most prevalent were of chromosome 22 (22.2%), 16 (22.2%), and 13 (9.5%). The relative frequencies of trisomies, monosomy X, and the different chromosomes involved in trisomies seem to differ between our study and those in which tissue cultures were analyzed. Our low frequency of 45,XO karyotypes and the shift to trisomies of chromosomes whose involvement increases steeply with maternal age are considered due to the approximately 3 year higher mean maternal age in our sample. The sex ratio (male to female) in chromosomally abnormal abortuses was 1.28, which is nearly identical to the 1.2 found in earlier studies. Surprisingly, in chromosomally normal abortions males were significantly outnumbered by females (sex ratio 0.76). Since maternal cell contamination cannot have influenced the sex ratio in our study, we consider it worthwhile to investigate whether failures associated with X inactivation are responsible for pregnancy wastage of some euploid female conceptuses. Knowledge of the karyotypes may serve as a prerequisite for the investigation of non-chromosomal genetic causes of pregnancy wastage.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0340-6717
pubmed:author
pubmed:issnType
Print
pubmed:volume
77
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
137-41
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
A cytogenetic study directly from chorionic villi of 140 spontaneous abortions.
pubmed:affiliation
Institut für Humangenetik der Universität, Göttingen, Federal Republic of Germany.
pubmed:publicationType
Journal Article