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Human Monozygotic and Plurizygotic Multiple Births: Heredity and Hormone Action

Published online by Cambridge University Press:  01 August 2014

L. Gedda  and
G. Brenci
L. Gedda
Affiliation:
«Gregor Mendel» Institute for Medical Genetics, and Twin Research, Rome, (Italia)
G. Brenci
Affiliation:
«Gregor Mendel» Institute for Medical Genetics, and Twin Research, Rome, (Italia)

Summary

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The Authors take once more into consideration the problem of the hereditary nature of twinning on the basis of their own studies and of recent findings on human twinning induced by human menopausal gonadotropin (HMG).

Personal studies concern 3,221 cases of twinning drawn from the special files (“Gemelloteca”) of the Mendel Institute. On the basis of this material the Authors state that the occurrence of the cases of twinning in the paternal and maternal ascendancies of the twin index cases is significantly more frequent than would be expected in proportion to the frequency of twinning events in the Italian population.

This finding is in agreement with the hypothesis of the hereditary nature of the twinning phenomenon.

The same material is used to compare the frequency of twinning in the paternal and maternal families of twins. The observed frequency in the maternal families is significantly higher than in paternal families in which the frequency approximates population values. This finding leads the Authors to formulate the hypothesis that the twinning trait is limited to the female sex and is presently manifested by the occurrence of twins in the next generation. Thus studies on the frequency of twinning as a hereditary phenomenon should be based on the families of the mothers of twins.

Original studies also concern the 1,105 triplet sets born in Italy in the years 1952-1961. A study of the experimental and theoretical distribution of sex combinations in this triplet material allowed the Authors to prove that the experimental distribution differs from the theoretical one, based on the hypothesis of independence of the two types of zygosity (MZ and DZ). The absence of independence is considered a proof of the hereditary singleness of twinning.

The Authors further take into consideration cases of twinning induced in sterile women by administration of human menopausal gonadotropin (HMG): they observe that cases reported to date seem to be limited to dizygotic or plurizygotic twinning. These findings lead the Authors to believe that in this case hypophyseal FSH, responsible for ovulation, fails to find the usual pathway leading to standard uniparous pregnancy in the human species; the mechanism involved in such pathway is the object of some hypotheses of a hormonal nature. The Authors also believe that FSH stimulates not only the follicle but also follicular gametogenesis and even perhaps the division of the fertilized egg resulting in MZ twinning.

Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 14 , Issue 2 , April 1965 , pp. 109 - 131
Copyright
Copyright © The International Society for Twin Studies 1965

References

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