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Lupus
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Review : Restriction fragment length polymorphisms of constant region genes of immunoglobulin lambda chains in Venezuelan patients with systemic lupus erythematosus

AM Blasini

Centro Nacional de Enfermedades Reumaticas, Hospital Universitario de Caracas

MB Delgado

Centro Nacional de Enfermedades Reumaticas, Hospital Universitario de Caracas

C. Valdivieso

Centro Nacional de Enfermedades Reumaticas, Hospital Universitario de Caracas

P. Guevara

Instituto de Biologia Celular, School of Biology, Universidad Central de Venezuela

JL Ramirez

Instituto de Biologia Celular, School of Biology, Universidad Central de Venezuela

IL Stekman

Centro Nacional de Enfermedades Reumaticas, Hospital Universitario de Caracas

MA Rodriguez

Centro Nacional de Enfermedades Reumaticas, Hospital Universitario de Caracas

RC Williams, JR

Division of Clinical Immunology and Rheumatology, University of Florida, Gainesville, Florida, USA

Previous studies suggest a potential association between human immunoglobulin (Ig) genes and susceptibility to systemic lupus erythematosus (SLE). Ig allotypic determinants seem to confer an increased risk for the disease in various ethnic patient populations. In this study we have examined the pattern of restriction fragment length polymorphisms (RFLP) of constant region lambda (C{lambda}) light chain genes in a group of 78 Venezuelan patients with SLE and 70 healthy controls. The frequency of the 8-kb allele and the 8/8 genotype was significantly lower in normal Venezuelan controls as compared to healthy British Cauca sians (P = 0.0002 and 0.0007 respectively). In turn, Venezuelan controls showed a higher frequency of the 18-kb allele and the 18/18 genotype (P = 0.0002 and 0.0052 respectively). However, there were no statistically significant differences in either parameter between Venezuelan SLE patients and healthy controls. Our study argues against a role for lambda light chain constant region genes in predisposition to SLE.

Key Words: SLE • Ig genes • RFLP • Hispanic

Lupus, Vol. 5, No. 4, 300-302 (1996)
DOI: 10.1177/096120339600500410
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