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Tandem Repeat Loci (tandem + repeat_locus)

Distribution by Scientific Domains
Life Sciences50%

Kinds of Tandem Repeat Loci

  • short tandem repeat locus
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    Selected Abstracts

    Allele Frequencies of 20 Y-Chromosomal Short Tandem Repeat Loci in a Tribal Population of Deccan Plateau, India

    JOURNAL OF FORENSIC SCIENCES, Issue 2 2007
    G. Hima Bindu M.Sc.
    POPULATION: Eighty male individuals from a nomadic tribal population belonging to Dravidian and Indo-Caucasian ethnicities from Deccan Plateau, Andhra Pradesh, India (1), were analyzed in the present study. [source]

    Allele Frequencies for Two Short Tandem Repeat Loci in the Chinese Han Population from Chengdu, China, and a Thai Population from Thailand

    JOURNAL OF FORENSIC SCIENCES, Issue 1 2007
    Yanyun Wang M.D.
    POPULATION: Chinese Han and Thai. [source]

    Hierarchical modeling of genome-wide Short Tandem Repeat (STR) markers infers native American prehistory

    AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY, Issue 2 2010
    Cecil M. Lewis Jr.
    Abstract This study examines a genome-wide dataset of 678 Short Tandem Repeat loci characterized in 444 individuals representing 29 Native American populations as well as the Tundra Netsi and Yakut populations from Siberia. Using these data, the study tests four current hypotheses regarding the hierarchical distribution of neutral genetic variation in native South American populations: (1) the western region of South America harbors more variation than the eastern region of South America, (2) Central American and western South American populations cluster exclusively, (3) populations speaking the Chibchan-Paezan and Equatorial-Tucanoan language stock emerge as a group within an otherwise South American clade, (4) Chibchan-Paezan populations in Central America emerge together at the tips of the Chibchan-Paezan cluster. This study finds that hierarchical models with the best fit place Central American populations, and populations speaking the Chibchan-Paezan language stock, at a basal position or separated from the South American group, which is more consistent with a serial founder effect into South America than that previously described. Western (Andean) South America is found to harbor similar levels of variation as eastern (Equatorial-Tucanoan and Ge-Pano-Carib) South America, which is inconsistent with an initial west coast migration into South America. Moreover, in all relevant models, the estimates of genetic diversity within geographic regions suggest a major bottleneck or founder effect occurring within the North American subcontinent, before the peopling of Central and South America. Am J Phys Anthropol 2010. © 2009 Wiley-Liss, Inc. [source]

    Haplotype Frequencies of Eight Y-Chromosome Short Tandem Repeats Loci in Four Amerindian Populations (State of Hidalgo, Mexico)

    JOURNAL OF FORENSIC SCIENCES, Issue 2 2007
    Carme Barrot Ph.D.
    POPULATION: Amerindian populations: Huastecos (n=97), Otomies de la Sierra (n=41), Otomies del Valle (n=40), and Tepehuas (n=13). [source]

    Inferences from DNA data: population histories, evolutionary processes and forensic match probabilities

    JOURNAL OF THE ROYAL STATISTICAL SOCIETY: SERIES A (STATISTICS IN SOCIETY), Issue 2 2003
    Ian J. Wilson
    Summary. We develop a flexible class of Metropolis,Hastings algorithms for drawing inferences about population histories and mutation rates from deoxyribonucleic acid (DNA) sequence data. Match probabilities for use in forensic identification are also obtained, which is particularly useful for mitochondrial DNA profiles. Our data augmentation approach, in which the ancestral DNA data are inferred at each node of the genealogical tree, simplifies likelihood calculations and permits a wide class of mutation models to be employed, so that many different types of DNA sequence data can be analysed within our framework. Moreover, simpler likelihood calculations imply greater freedom for generating tree proposals, so that algorithms with good mixing properties can be implemented. We incorporate the effects of demography by means of simple mechanisms for changes in population size and structure, and we estimate the corresponding demographic parameters, but we do not here allow for the effects of either recombination or selection. We illustrate our methods by application to four human DNA data sets, consisting of DNA sequences, short tandem repeat loci, single-nucleotide polymorphism sites and insertion sites. Two of the data sets are drawn from the male-specific Y-chromosome, one from maternally inherited mitochondrial DNA and one from the , -globin locus on chromosome 11. [source]

    Maximum likelihood estimates of admixture in northeastern Mexico using 13 short tandem repeat loci

    AMERICAN JOURNAL OF HUMAN BIOLOGY, Issue 4 2002
    Ricardo M. Cerda-Flores
    Tetrameric short tandem repeat (STR) polymorphisms are widely used in population genetics, molecular evolution, gene mapping and linkage analysis, paternity tests, forensic analysis, and medical applications. This article provides allelic distributions of the STR loci D3S1358, vWA, FGA, D8S1179, D21S11, D18S51, D5S818, D13S317, D7S820, CSF1PO, TPOX, TH01, and D16S539 in 143 Mestizos from Northeastern Mexico, estimates of contributions of genes of European (Spanish), American Indian and African origin in the gene pool of this admixed Mestizo population (using 10 of these loci); and a comparison of the genetic admixture of this population with the previously reported two polymorphic molecular markers, D1S80 and HLA-DQA1 (n = 103). Genotype distributions were in agreement with Hardy-Weinberg expectations (HWE) for almost all 13 STR markers. Maximum likelihood estimates of admixture components yield a trihybrid model with Spanish, Amerindian, and African ancestry with the admixture proportions: 54.99% ± 3.44, 39.99% ± 2.57, and 5.02% ± 2.82, respectively. These estimates were not significantly different from those obtained using D1S80 and HLA-DQA1 loci (59.99% ± 5.94, 36.99% ± 5.04, and 3.02% ± 2.76). In conclusion, Mestizos of Northeastern Mexico showed a similar ancestral contribution independent of the markers used for evolutionary purposes. Further validation of this database supports the use of the 13 STR loci along with D1S80 and HLA-DQA1 as a battery of efficient DNA forensic markers in Northeastern Mestizo populations of Mexico. Am. J. Hum. Biol. 14:429,439, 2002. © 2002 Wiley-Liss, Inc. [source]

    A genetic analysis of the Sakishima islanders reveals no relationship with Taiwan aborigines but shared ancestry with Ainu and main-island Japanese

    AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY, Issue 2 2010
    Hirotaka Matsukusa
    Abstract The Sakishima islands are members of the Ryukyu island chain, stretching from the southwestern tip of the Japanese archipelago to Taiwan in the East China Sea. Archaeological data indicate cultural similarities between inhabitants of prehistoric Sakishima and Neolithic Taiwan. Recent studies based on tooth crown traits show remarkably high inter-island diversity among Ryukyu islanders, suggesting that the Sakishima islanders might have genetic backgrounds distinct from main-island Okinawa people. To investigate the genetic diversity of the Ryukyu islanders, we analyzed mtDNA, Y chromosome, and autosomal short tandem repeat loci in a sample of main-island Okinawa people and Sakishima (Miyako and Ishigaki) islanders whose participated in a previous study of tooth crown morphology. Our phylogenetic analysis of maternal (mtDNA) and paternal (Y chromosome) lineages shows that the Sakishima islanders are more closely related to people from the Japanese archipelago than to Taiwan aborigines. Miyako islanders and the Hokkaido Ainu have the first and second highest frequencies (respectively) of the Y-chromosomal Alu-insertion polymorphism, which is a presumable Jomon marker. Genetic diversity statistics show no evidence of demographic reduction or of extreme isolation in each island's population. Thus, we conclude that 1) Neolithic expansion from Taiwan did not contribute to the gene pool of modern Sakishima islanders, 2) male-lineage of the Ryukyu islanders likely shares a common ancestor with the Hokkaido Ainu who are presumably direct descendants of the Jomon people, and 3) frequent reciprocal gene flow among islands has masked the trace of common ancestry in the Ryukyu island chain. Am J Phys Anthropol, 2010. © 2010 Wiley-Liss, Inc. [source]

    A proposal for standardization in forensic bovine DNA typing: allele nomenclature of 16 cattle-specific short tandem repeat loci

    ANIMAL GENETICS, Issue 5 2009
    L. H. P. Van De Goor
    Summary In this study, a proposal is presented for the allele nomenclature of 16 polymorphic short tandem repeat (STR) loci (BM1824, BM2113, ETH10, ETH225, INRA023, SPS115, TGLA122, TGLA126, TGLA227, ETH3, TGLA53, BM1818, CSRM60, CSSM66, HAUT27 and ILSTS006) for bovine genotyping (Bos taurus). The nomenclature is based on sequence data of the polymorphic region(s) of the STR loci as recommended by the DNA commission of the International Society of Forensic Genetics for human DNA typing. To cover commonly and rarely occurring alleles, a selection of animals homozygous for the alleles at these STR loci were analysed and subjected to sequence studies. The alleles of the STR loci consisted either of simple or compound dinucleotide repeat patterns. Only a limited number of alleles with the same fragment size showed different repeat structures. The allele designation described here was based on the number of repeats including all variable regions within the amplified fragment. The set of 16 STR markers should be propagated for the use in all bovine applications including forensic analysis. [source]