title: Balearic archipelago: three islands, three beta-thalassemia population patterns.
abstract: The mutation spectrum of 175 β-thalassemia (β-thal) carriers, identified in pilot carrier screening on 22,713 individuals from Balearic Islands (Spain), is reported. The β(0) CD39 (C>T) mutation is the most frequent (61.1%), followed by β(+) IVS-I-110 (G>A) (12.0%), β(+) IVS-I-6 (T>C) and β(0) IVS-1-1 (G>A) (3.4% both) and eight other rare mutations (2.9-0.6%); with a distinct prevalence and distribution between islands. Minorca shows the highest prevalence in Iberian populations, with a single mutation, CD39 (C>T), present in most β-thal carriers. Ibiza is the only Western Mediterranean population where the most frequent β-thal mutation is IVS-I-110 (G>A). These results can be explained by a combination of historical-demographic characteristics together with evolutionary forces such as founder effect, genetic drift and probably selection by malaria. Knowledge of the mutational spectrum in the Balearic Islands will enable to optimize mutation detection strategy for genetic diagnosis of β-thal in these islands.
authors.affiliation: Servicio de Análisis Clínicos, Hospital Universitario Son Espases, Ctra. Valldemossa, 79, 07010 Palma, Illes Balears, Spain.
authors.forename: H
authors.initials: H
authors.lastname: López-Escribano
authors.forename: M M
authors.initials: MM
authors.lastname: Parera
authors.forename: P
authors.initials: P
authors.lastname: Guix
authors.forename: J M
authors.initials: JM
authors.lastname: Serra
authors.forename: A
authors.initials: A
authors.lastname: Gutierrez
authors.forename: D
authors.initials: D
authors.lastname: Balsells
authors.forename: E
authors.initials: E
authors.lastname: Oliva-Berini
authors.forename: J A
authors.initials: JA
authors.lastname: Castro
authors.forename: M M
authors.initials: MM
authors.lastname: Ramon
authors.forename: A
authors.initials: A
authors.lastname: Picornell
mesh_terms: D040961:Genetic Drift; D005820:Genetic Testing; D005828:Genetics, Population; D005838:Genotype; D006579:Heterozygote; D006801:Humans; D062312:Islands / Q000453:epidemiology; D009154:Mutation; D017354:Point Mutation; D060047:Reproductive Isolation; D013030:Spain / Q000453:epidemiology; D055544:beta-Globins / Q000235:genetics*; D017086:beta-Thalassemia / Q000453:epidemiology / Q000235:genetics*
chemical_list: D055544:beta-Globins