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Digital Dermatoglyphic Heritability Differences as Evidenced by a Female Twin Study

Published online by Cambridge University Press:  21 February 2012

João Felipe Machado*
Affiliation:
Laboratório de Biociências do Movimento Humano (LABIMH), Escola de Educação Física e Desporto, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil; Hospital Universitário Clementino Fraga Filho (HUCFF), Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil. jfmach@uol.com.br
Paula Roquetti Fernandes
Affiliation:
Laboratório de Biociências do Movimento Humano (LABIMH), Escola de Educação Física e Desporto, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil; Centro de Excelência em Avaliação Física (CEAF), Rio de Janeiro, Brasil.
Ricardo Wagner Roquetti
Affiliation:
Centro de Excelência em Avaliação Física (CEAF), Rio de Janeiro, Brasil; Universidade da Força Aérea, Rio de Janeiro, Brasil.
José Fernandes Filho
Affiliation:
Laboratório de Biociências do Movimento Humano (LABIMH), Escola de Educação Física e Desporto, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil; Hospital Universitário Clementino Fraga Filho (HUCFF), Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil; Centro de Excelência em Avaliação Física (CEAF), Rio de Janeiro, Brasil.
*
*Address for correspondence: João Felipe Machado, Universidade Federal do Rio de Janeiro, Laboratório de Biociências do Movimento Humano — LABIMH, Escola de Educação Física e Desporto, Avenida Carlos Chagas Filho, 540, Cidade Universitária, CEP 21941-599, Rio de Janeiro, RJ, Brazil.

Abstract

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The genetic and environmental contributions to determine digital dermatoglyphic traits were investigated by using female dizygotic and monozygotic twin pairs to estimate heritability indexes (h2). The evaluated sample was composed by 20 monozygotic twin pairs and 13 dizygotic twin pairs. A significant heritability (h2 = 0.65 to 0.96) was observed for 12 dermatoglyphic characteristics (delta indexes and ridge counts for right hand, left hand and both hands, and ridge counts for most individual fingers). A negative correlation between the ridge counts and heritability indexes from individual fingers was found for the left hand, which appears to be associated to a higher arch pattern frequency in most left-hand fingers, since this frequency was negatively correlated with ridge counts and positively correlated with heritability indexes. Heritability indexes of right-hand fingers were positively correlated with loop pattern frequency and negatively correlated with whorl pattern frequency. The low heritability of ridge counts from left thumb, ring and little fingers (h2 = 0.11 to 0.32) indicates a higher chance that the chorion type had an influence in the intra-pair variance of monozygotic twins. Results confirmed the predominant genetic influence on the total ridge count. The heritability indexes varied in up to 8 times between different fingers and its association to ridge counts and pattern frequency was very variable between hands, evidencing that the use of dermatoglyphic traits from individual fingers as indicators of genetic influences to other human traits should consider this variability.

Type
Articles
Copyright
Copyright © Cambridge University Press 2010