title: Genetic linkage study for bipolar disorders on chromosomes 17 and 18 in families with a high expression of mental illness from the Balearic Islands.
abstract: Genetically, bipolar disorder is a complex genetic illness, in which both genes and environmental factors play an important role in pathogenesis. Linkage studies have reported suggestive evidence for genomic regions, especially on chromosome 18, but in most cases they have been inconclusive. A total of 12 pedigrees, from the islands of Majorca and Minorca (Balearic Archipelago), with a high expression of mental illness, have been studied. A scan of 29 polymorphic short tandem repeat markers was performed, spanning chromosomes 17 and 18 for bipolar and other affective disorder susceptibility loci. Narrow (only bipolar I disorder) and broad (bipolar plus other affective disorders) diagnosis criteria were employed. The loci D18S63, D18S452, D18S53, D18S61, D18S1161 and D17S831 showed LOD score values of less than -2. Thus, the positive linkage found by other authors on the regions 18p11.2 and 18p11.3 has not been reproduced in the families studied. The data obtained in chromosome 17 suggested two possible regions that could contain a bipolar disorder susceptibility gene: 17q11 (D17S1857, D17S798) and especially 17q24-qter (D17S949, D17S928). The maximum significant linkage was to D17S949 (17q24), following a recessive mode of inheritance. We have also found a positive LOD score value for D18S478 marker located in the region 18q12.
authors.affiliation: Laboratory of Genetics, Department of Biology, University Institute of Health Sciences (IUNICS), and Juan March Hospital, Palma de Mallorca, Spain.
authors.forename: Carmen
authors.initials: C
authors.lastname: Tomàs
authors.forename: Francisca
authors.initials: F
authors.lastname: Cañellas
authors.forename: Virginia
authors.initials: V
authors.lastname: Rodríguez
authors.forename: Antònia
authors.initials: A
authors.lastname: Picornell
authors.forename: Oriol
authors.initials: O
authors.lastname: Lafau
authors.forename: Marcos
authors.initials: M
authors.lastname: Nadal
authors.forename: Miquel
authors.initials: M
authors.lastname: Roca
authors.forename: M Jesús
authors.initials: MJ
authors.lastname: Serrano
authors.forename: José A
authors.initials: JA
authors.lastname: Castro
authors.forename: M Misericòrdia
authors.initials: MM
authors.lastname: Ramon
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D001266:Atlantic Islands; D001714:Bipolar Disorder / Q000235:genetics*; D002648:Child; D002874:Chromosome Mapping; D002886:Chromosomes, Human, Pair 17; D002887:Chromosomes, Human, Pair 18; D005190:Family; D005260:Female; D008040:Genetic Linkage; D005819:Genetic Markers; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000235:genetics*; D008875:Middle Aged; D010375:Pedigree; D013030:Spain
chemical_list: D005819:Genetic Markers