Non-major histocompatibility complex-linked diabetes susceptibility loci on chromosomes 4 and 13 in a backcross of the DP-BB/Wor rat to the WF rat.

Martin, A M; Blankenhorn, E P; Maxson, M N; Zhao, M; Leif, J; Mordes, J P; Greiner, D L

Martin, A M; Blankenhorn, E P; Maxson, M N; Zhao, M; Leif, J; Mordes, J P; Greiner, D L.

Afiliación

Martin AM; Department of Microbiology and Immunology, Allegheny University of the Health Sciences, Philadelphia, Pennsylvania, USA.

Diabetes ; 48(1): 50-8, 1999 Jan.

Article en En | MEDLINE | ID: mdl-9892222

RESUMEN

BB rats are used as models of autoimmune human IDDM. Genetic control of IDDM in both species is complex, including both major histocompatibility complex (MHC)-linked and non-MHC-linked genes. DP-BB rats develop IDDM spontaneously. Expression of disease in these animals requires homozygosity at the lyp locus, which causes lymphopenia. All genetic analyses of BB rat diabetes to date have backcrossed to the DP-BB strain or used (DP-BB x non-BB)F2 animals to ensure that a fraction of progeny are homozygous for lyp. Here we report the analysis of a backcross of the DP-BB rat to the histocompatible WF rat. Neither WF nor (WF x DP-BB)F1 animals develop spontaneous IDDM. However, 95% of (WF x DP-BB)F1 rats and a fraction of (WF x DP-BB) x WF backcross animals readily develop IDDM after treatment with polyinosinic:polycytidylic acid and a cytotoxic anti-RT6.1 monoclonal antibody. Using simple sequence length polymorphism analysis, we have mapped loci on chromosomes 4 and 13 that show significant linkage to IDDM expression and insulitis. The susceptibility locus on chromosome 4 is linked to, but not identical to, lyp. We propose a disease model for the BB rat that requires 1) the RT1u MHC haplotype for disease susceptibility, 2) a new locus on chromosome 4 for disease initiation (as measured by insulitis), 3) a new locus on chromosome 13 for disease progression in response to environmental perturbation, and 4) lyp for spontaneous expression of disease.

Asunto(s)

Cromosomas Humanos Par 13/genética; Cromosomas Humanos Par 4/genética; Diabetes Mellitus Tipo 1/genética; Ligamiento Genético/efectos de los fármacos; Predisposición Genética a la Enfermedad/genética; Complejo Mayor de Histocompatibilidad/genética; Animales; Mapeo Cromosómico; Diabetes Mellitus Tipo 1/etiología; Progresión de la Enfermedad; Genoma; Humanos; Hibridación Genética; Islotes Pancreáticos; Pancreatitis/complicaciones; Pancreatitis/genética; Pancreatitis/fisiopatología; Fenotipo; Ratas; Ratas Endogámicas BB/genética; Ratas Endogámicas WF/genética

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Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Cromosomas Humanos Par 4 / Cromosomas Humanos Par 13 / Predisposición Genética a la Enfermedad / Diabetes Mellitus Tipo 1 / Ligamiento Genético / Complejo Mayor de Histocompatibilidad Tipo de estudio: Etiology_studies Límite: Animals / Humans Idioma: En Revista: Diabetes Año: 1999 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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