title: Polymorphism of immunoglobulin lambda constant region genes in populations from France, Lebanon and Tunisia.
abstract: Polymorphism of immunoglobulin lambda constant region (IGLC) genes has been studied in French, Lebanese and Tunisian people. The human IGLC polymorphisms appear as EcoRI restriction fragment length variations-8, 13, 18 or 23 kb-, these polymorphic fragments being related to a number of IGLC genes varying from six to nine per haploid genome. DNAs digested with the endonucleases EcoRI and HindIII were hybridized to a human IGLC probe and an immunoglobulin lambda intervening sequence region probe containing the J lambda 2 gene segment. Restriction fragments detected in Southern hybridizations were assigned to the IGLC locus map. Family studies allowed us to confirm the allelic nature of four of the different EcoRI restriction fragments observed. Frequencies of the corresponding alleles in French, Lebanese and Tunisian populations were determined and compared. The decrease of the 8-kb fragment (allele A1) frequency and, conversely, the increase of that of the 13-kb and 18-kb fragments (alleles A2 and A3) seemed to be correlated to a Negroid African contribution in the gene pool more important in Tunisia than in Lebanon.
authors.affiliation: Laboratoire d'Immunogénétique, UA CNRS 1191 Génétique Moléculaire, Université des Science, Techniques du Languedoc, Montpellier, France.
authors.forename: N
authors.initials: N
authors.lastname: Ghanem
authors.forename: P
authors.initials: P
authors.lastname: Dariavach
authors.forename: M
authors.initials: M
authors.lastname: Bensmana
authors.forename: J
authors.initials: J
authors.lastname: Chibani
authors.forename: G
authors.initials: G
authors.lastname: Lefranc
authors.forename: M P
authors.initials: MP
authors.lastname: Lefranc
mesh_terms: D015246:Deoxyribonuclease EcoRI; D015247:Deoxyribonuclease HindIII; D005260:Female; D005602:France; D005828:Genetics, Population; D006801:Humans; D007127:Immunoglobulin Constant Regions / Q000235:genetics; D007146:Immunoglobulin lambda-Chains / Q000235:genetics*; D007861:Lebanon; D008297:Male; D010375:Pedigree; D012150:Polymorphism, Restriction Fragment Length; D014416:Tunisia
chemical_list: D007127:Immunoglobulin Constant Regions; D007146:Immunoglobulin lambda-Chains; D015246:Deoxyribonuclease EcoRI; D015247:Deoxyribonuclease HindIII