title: The STR polymorphism (AAAAT)n within the intron 1 of the tumor protein 53 (TP53) locus in 17 populations of different ethnic groups of Africa, America, Asia and Europe.
abstract: The STR (AAAAT)n within intron 1 of the TP53 locus was screened in 17 populations from 3 main ethnic groups: Europeans, Asiatics, and Africans, and from the hybrid population of Costa Rica (1968 samples). Three alleles, 126/7 (bp/copies of the repeat), 131/8 and 136/9 were the most prevalent in all populations. Other alleles rarely reached frequencies of 10% or higher. Observed heterozygosities ranged between 0.351 and 0.829. Patterns of diversity fit well with both the geographic origin of the samples and the history of the populations screened. A statistical test suggests that single-step mutational events have been the main mechanism producing new alleles at this locus. Fixation indexes (R(ST)) for this marker showed an effect of population subdivision on divergence only within the Asiatic group; they were insensitive at the level of major ethnic groups as well as within Africans and within Europeans.
authors.affiliation: Escuela de Biología and Instituto de Investigaciones en Salud Universidad de Costa Rica. azofeifa@biologia.ucr.ac.cr
authors.forename: Jorge
authors.initials: J
authors.lastname: Azofeifa
authors.forename: Meinhard
authors.initials: M
authors.lastname: Hahn
authors.forename: Edward
authors.initials: E
authors.lastname: Ruiz
authors.forename: Lars
authors.initials: L
authors.lastname: Hummerich
authors.forename: Ana I
authors.initials: AI
authors.lastname: Morales
authors.forename: Gerardo
authors.initials: G
authors.lastname: Jiménez
authors.forename: Ramiro
authors.initials: R
authors.lastname: Barrantes
mesh_terms: D005787:Gene Frequency / Q000235:genetics*; D006801:Humans; D007438:Introns / Q000235:genetics; D018895:Microsatellite Repeats / Q000235:genetics*; D010802:Phylogeny; D011110:Polymorphism, Genetic / Q000235:genetics*; D044469:Racial Groups / Q000235:genetics*; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*
chemical_list: D016159:Tumor Suppressor Protein p53