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Sun R.,Xian Jiaotong University | Zhu Y.,Xian Jiaotong University | Zhu Y.,Key Laboratory of Reproduction | Zhu F.,Xian Jiaotong University | And 7 more authors.
Molecular Biology Reports | Year: 2012

In the present study, 10 short tandem repeats (STR) (HPRTB, DXS6789, DXS6799, DXS6804, DXS7130, DXS7132, DXS7133, DXS7423, DXS7424, and DXS8378) on X chromosome were investigated among four ethnic populations (431 individuals) in northwest of China, in order to learn about the genetic diversity, forensic suitability, and possible genetic affinities of the populations. The polymorphism information content (PIC) values for the ten loci range from 0.340 to 0.810, and the observed heterozygosity values for the ten loci range from 0.397 to 0.860, the results indicated that the ten loci have a moderate degree of variability in the four populations, and each population has its own characteristics of genetic structure. A Neighbor-joining (NJ) tree constructed on the basis of the generated data shows very low genetic distance between Han, Mongolian and Tibetan, Dongxiang and Tu as well as between Salar and Bonan populations. Our results based on genetic distance analysis are consistent with the results of earlier studies based on linguistics and the immigration history and origin of these populations. These STR loci on the X chromosome studied here are not only useful in showing significant genetic variation between the populations, but also are suitable for human identity testing among the four populations. © Springer Science+Business Media B.V. 2011. Source

Zhang C.,Key Laboratory of Fertility Preservation and Maintenance | Zhang C.,Key Laboratory of Reproduction | Dang J.,Key Laboratory of Fertility Preservation and Maintenance | Dang J.,Key Laboratory of Reproduction | And 17 more authors.
American Journal of Human Biology | Year: 2013

Objectives: The relative length of the second-to-fourth digits (2D:4D) has been linked with prenatal androgen in humans. A recent study shows that the 2D:4D ratio in mice is controlled by the balance of androgen to estrogen signaling during a narrow window of digit development. Androgen receptor (AR) activity is higher in digit 4 than in digit 2, and inactivation of AR decreases growth of digit 4, which causes a higher 2D:4D ratio. At the molecular level, the effect of androgens is mediated through the activation of AR. The CAG/GGN repeat polymorphisms of the AR gene are associated with AR activity. Here, we investigate the effect of CAG/GGN repeat polymorphisms in AR on 2D:4D in Chinese. Methods: Digit lengths of the second and fourth fingers were measured from photocopies of the ventral surface of the hand and by actual finger measurements. We genotyped AR polymorphisms by ABI 3730 DNA analyzer. Results: We found that left hand 2D:4D ratio was longer than that of the right hand both in males and in females. We failed to find any relationship between CAG/GGN alleles and the left hand, right hand, right minus left-hand or mean hand 2D:4D ratios (all, r < 0.20, P > 0.05). Conclusions: In this study, we first found that the left hand 2D:4D ratio was longer than that of the right hand in both males and females. However, we found that both CAG and GGN alleles were not associated with the left hand, right hand, right minus left-hand or mean hand 2D:4D ratios. © 2012 Wiley Periodicals, Inc. Source

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