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Genetic Penetrance From MZ Twins of Absent C-Triradius, A Palmar Dermatoglyphic Trait

Published online by Cambridge University Press:  01 August 2014

H. W. Kloepfer  and
Paolo Parisi
H. W. Kloepfer*
Affiliation:
Department of Anatomy, Tulane University, New Orleans, Louisiana, USA
Paolo Parisi
Affiliation:
The Gregor Mendel Institute of Medical Genetics and Twin Studies, Rome, Italy
*
Department of Anatomy, Tulane University, 1430 Tulane Avenue, New Orleans, Louisiana 70112, USA

Abstract

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Among 59 sets of MZ male twins and 48 sets of MZ female twins from Italy, 7 male sets (11.9%) and 7 female sets (14.6%) had absent c-triradius on one or more palms; among 214 individuals who had a MZ twin, 19 (8.9%) had absent c-triradius in one or both palms. Due to small numbers these percentages are comparable to the occurrence of absent c-triradius found in 8.2% of 3946 Caucasians. When one member of a set of MZ twins showed the trait in one or both palms, 35.7% (5/14) of the other members also showed the trait in one or both palms. When an individual showed the trait in one palm, 26.3 % (5/19) of the other palms also showed the trait. These two estimates of penetrance combined give an average value of 30.3%, (10/33) which is comparable to an estimate of 30% found in a study of 478 family units in which transmission was compatible with an autosomal dominant gene.

Type
5. Twin Studies in Human Genetics
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 25 , Issue 1 , January 1976 , pp. 177 - 180
Copyright
Copyright © The International Society for Twin Studies 1976

References

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