Machado João Felipe, Fernandes Paula Roquetti, Roquetti Ricardo Wagner, Filho José Fernandes
Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil.
Twin Res Hum Genet. 2010 Oct;13(5):482-9. doi: 10.1375/twin.13.5.482.
The genetic and environmental contributions to determine digital dermatoglyphic traits were investigated by using female dizygotic and monozygotic twin pairs to estimate heritability indexes (h(2)). The evaluated sample was composed by 20 monozygotic twin pairs and 13 dizygotic twin pairs. A significant heritability (h(2) = 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 (h(2) = 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.
通过使用女性异卵和同卵双胞胎对来估计遗传力指数（h(2)），研究了决定手指皮纹特征的遗传和环境因素。评估样本由20对同卵双胞胎和13对异卵双胞胎组成。观察到12种皮纹特征（右手、左手和双手的三角指数和嵴纹计数，以及大多数单个手指的嵴纹计数）具有显著的遗传力（h(2)=0.65至0.96）。发现左手单个手指的嵴纹计数与遗传力指数之间呈负相关，这似乎与大多数左手手指中较高的弓形纹频率有关，因为该频率与嵴纹计数呈负相关，与遗传力指数呈正相关。右手手指的遗传力指数与箕形纹频率呈正相关，与螺纹纹频率呈负相关。左手拇指、无名指和小指的嵴纹计数遗传力较低（h(2)=0.11至0.32），表明绒毛膜类型对同卵双胞胎对内差异有影响的可能性更高。结果证实了遗传因素对总嵴纹计数的主要影响。不同手指的遗传力指数变化高达8倍，其与嵴纹计数和纹型频率的关联在双手之间差异很大，这表明将单个手指的皮纹特征用作其他人类特征遗传影响指标时应考虑这种变异性。
