title: Abnormal V(D)J recombination of T cell receptor beta locus in SMAR1 transgenic mice.
abstract: Scaffold/matrix-associated region-1-binding protein (SMAR1) specifically interacts with the MARbeta sequence, which is located 400-bp upstream of the murine TCRbeta enhancer and is highly expressed during the DP stage of thymocyte development. To further analyze the functions of SMAR1, transgenic mice were generated that express SMAR1 in a tissue-independent manner. SMAR1-overexpressing mice exhibit severely altered frequency of the T cells expressing commonly used Vbetas (Vbeta5.1/5.2 and Vbeta8.1/8.2/8.3). The rearrangements of Vbeta5.1/5.2, Vbeta8.1/8.2/8.3 loci are also reduced in SMAR1 transgenic mice. The T cells in SMAR1 transgenic mice exhibit a mild perturbation at the early DN stage. SMAR1 transgenic mice exhibit hypercellular lymph nodes and spleen accompanied with prominent architectural defects in these organs. These results indicate that SMAR1 plays an important role in the regulation of T cell development as well as V(D)J recombination besides maintaining the architecture of the lymphoid organs.
authors.affiliation: National Center for Cell Science, Pune University Campus, Ganeshkhind, Pune 411007, India.
authors.forename: Ruchika
authors.initials: R
authors.lastname: Kaul-Ghanekar
authors.forename: Subeer
authors.initials: S
authors.lastname: Majumdar
authors.forename: Archana
authors.initials: A
authors.lastname: Jalota
authors.forename: Neerja
authors.initials: N
authors.lastname: Gulati
authors.forename: Neetu
authors.initials: N
authors.lastname: Dubey
authors.forename: Bhaskar
authors.initials: B
authors.lastname: Saha
authors.forename: Samit
authors.initials: S
authors.lastname: Chattopadhyay
mesh_terms: D000818:Animals; D018797:Cell Cycle Proteins / Q000235:genetics*; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D017931:DNA Primers; D004268:DNA-Binding Proteins / Q000235:genetics*; D015329:Gene Rearrangement, T-Lymphocyte; D019674:Genes, T-Cell Receptor beta; D006801:Humans; D008198:Lymph Nodes / Q000276:immunology; D051379:Mice; D008822:Mice, Transgenic; D009687:Nuclear Proteins / Q000235:genetics*; D011401:Promoter Regions, Genetic; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D045567:VDJ Recombinases / Q000378:metabolism*
chemical_list: C417914:BANP protein, human; D018797:Cell Cycle Proteins; D017931:DNA Primers; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D004247:DNA; D045567:VDJ Recombinases