A Variant in LIN28B Is Associated with 2D:4D Finger-Length Ratio, a Putative Retrospective Biomarker of Prenatal Testosterone Exposure
ABSTRACT The ratio of the lengths of an individual's second to fourth digit (2D:4D) is commonly used as a noninvasive retrospective biomarker for prenatal androgen exposure. In order to identify the genetic determinants of 2D:4D, we applied a genome-wide association approach to 1507 11-year-old children from the Avon Longitudinal Study of Parents and Children (ALSPAC) in whom 2D:4D ratio had been measured, as well as a sample of 1382 12- to 16-year-olds from the Brisbane Adolescent Twin Study. A meta-analysis of the two scans identified a single variant in the LIN28B gene that was strongly associated with 2D:4D (rs314277: p = 4.1 x 10(-8)) and was subsequently independently replicated in an additional 3659 children from the ALSPAC cohort (p = 1.53 x 10(-6)). The minor allele of the rs314277 variant has previously been linked to increased height and delayed age at menarche, but in our study it was associated with increased 2D:4D in the direction opposite to that of previous reports on the correlation between 2D:4D and age at menarche. Our findings call into question the validity of 2D:4D as a simplistic retrospective biomarker for prenatal testosterone exposure.
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ABSTRACT: Objectives: Second–to–fourth digit ratio (2D:4D) is proposed as a proxy for prenatal balance of sex hormones and is related to hormone–dependent characteristics in adult life, and a possible predictor of disease later in life. Here, we studied the relationship between 2D:4D and ovarian steroid hormones (17β–estradiol and progesterone) among women of reproductive age. Methods: 186 healthy, premenopausal women, aged 24–37 collected daily saliva samples during the entire menstrual cycle. Data on reproductive and lifestyle characteristics were collected via questionnaires and anthropometric measurements were performed. Results: No statistically significant relationships were detected between adult women’s sex hormone concentrations (17β–estradiol and progesterone) during the menstrual cycle and 2D:4D, in either left or right hand, when controlling for size at birth, BMI and physical activity. Conclusions: This study shows, for the first time in a large sample of reproductive age women, that 2D:4D is not a predictor of adult women’s sex hormone concentration. The lack of relationship may be due to the fact that 2D:4D might be genetically determined and is not related to maternal nutritional environment during fetal development. These results support the hypothesis that, in contrast to the quality of nutritional fetal environment, fetal hormonal environment (reflected by 2D:4D) does not determine reproductive physiology in later life.American Journal of Human Biology 03/2015; DOI:10.1002/ajhb.22717 · 1.93 Impact Factor
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ABSTRACT: This study examines the relationship between prenatal testosterone exposure (PTE) and selection into entrepreneurship. We argue that the relationship between PTE and entrepreneurial intent is positive and mediated by general and domain-specific risk-taking related to financial investment and professional career. Using the second-to-fourth digit ratio (2D:4D) as noninvasive retrospective marker for PTE, we identify two-step mediation effects of PTE on entrepreneurial intent through both general and domain-specific risk-taking. To account for possible socialization-based effects, we control for gender and parental self-employment. Applying ordinary least square regression analyses and structural equation models, we provide empirical evidence for a biological association between 2D:4D and entrepreneurial intent.Entrepreneurship: Theory and Practice 01/2016; DOI:10.1111/etap.12165 · 2.54 Impact Factor
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ABSTRACT: Background: Ratio of second and fourth digit (2D:4D) is known to be germane in analyzing utero concentrations of testosterone and estrogen in human and other vertebrates. 2D:4D had been linked to several traits like athletes’ abilities, reproductive success, risk of cancer and cardiovascular disease (CVD). Metabolic syndrome (MetS) is a clustering of several cardiovascular risk factors. Waist circumference (WC), neck circumference (NC), body mass index (BMI) and waist-to-height ratio (WHtR) are important in measuring MetS. This study investigated sexual dimorphism in 2D:4D and its relationship with MetS indices and CVD factors among adult residing in Ilorin, North central Nigeria. Materials and Methods: This is a cross-sectional, stratified multi-staged sampling study. Participants residing in different neighborhoods were visited at home where finger lengths and anthropometric traits were measured. Participants include 801 healthy adults aged 18-44 years (56% male) who had been living in the area for more than 3 years. Results: Males showed significantly lower 2D:4D than females (unpaired t-test; t  = 11.49, P = 0.001). A significant positive correlation was observed in MetS markers and 2D:4D. WHtR showed the highest correlation with 2D:4D in male (r = 0.461, P ≤ 0.001) and female (r = 0.408, P ≤ 0.001) when compared with BMI, NC and WC. All positive correlations recorded in this study were high in male and right hand. Conclusion: Our results showed that 2D:4D is sexual dimorphic and right hand 2D:4D as a predictor of MetS is better. We concluded that 2D:4D is a proxy for MetS and CVD risk factors in Ilorin.Journal of research in medical sciences 03/2014; 19(3):234-9. · 0.61 Impact Factor