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Effects of Type of Placentation on Birthweight and its Variability in Monozygotic and Dizygotic Twins

Published online by Cambridge University Press:  01 August 2014

L.A. Corey ,
W.E. Nance ,
K.W. Kang  and
J.C. Christian
L.A. Corey*
Affiliation:
Department of Human Genetics, Medical College of Virginia, Richmond
W.E. Nance
Affiliation:
Department of Human Genetics, Medical College of Virginia, Richmond
K.W. Kang
Affiliation:
Department of Medical Genetics, Indiana University School of Medicine, Indianapolis
J.C. Christian
Affiliation:
Department of Medical Genetics, Indiana University School of Medicine, Indianapolis
*
Department of Human Genetics, Medical College of Virginia, MCV Station, Richmond, VA 23298, USA

Abstract

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Birthweight was measured on 188 monochorionic monozygotic, 54 dichorionic monozygotic, 102 like-sexed dizygotic, and 94 unlike-sexed dizygotic liveborn twin pairs. Overall, males were found to be significantly heavier than females. These differences were not significant, however, when birthweights were compared within zygosity/chorion-type categories. Males were also characterized by a slightly greater overall total variance. Comparisons of intrapair variation of monochorionic and dichorionic monozygotic twins revealed significant differences between monochorionic pairs and dichorionic separate pairs and no significant differences between monochorionic pairs and dichorionic fused pairs. The results of this study suggest that placental proximity may have as important an influence on variation in birthweight as does the presence or absence of vascular anastomoses.

Keywords

BirthweightTwin pregnancyPlacental effectsLength of gestationSex effectsFetal hormones
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 28 , Issue 1 , January 1979 , pp. 41 - 50
Copyright
Copyright © The International Society for Twin Studies 1979

References

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