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. 1993 Mar;13(3):1943–1950. doi: 10.1128/mcb.13.3.1943

Extinction of T cell receptor alpha-chain gene expression accompanied by loss of the lymphoid enhancer-binding factor 1 (LEF-1) in murine somatic cell hybrids.

T Yamada 1, Y Hitomi 1, K Shimizu 1, M Ohki 1, T Oikawa 1
PMCID: PMC359508  PMID: 8382779

Abstract

To investigate the presence of a negative regulatory factor(s) suppressing T-cell receptor alpha-chain (TCR alpha) gene expression in non-T cells, 10 independent cell hybrid clones were generated between mouse T-cell lymphoma EL4 cells (TCR alpha+/beta+) and mouse fibroblast B82 cells. These cell hybrids showed a typical fibroblastic morphology and retained an approximate sum of chromosome numbers derived from both parental cells. No transcripts of the TCR alpha gene were detected in the cell hybrids, although the presence of the rearranged TCR alpha allele from EL4 cells was confirmed. The possibility of involvement of nuclear proteins responsible for the activity of the TCR alpha gene enhancer in the extinction of TCR alpha gene expression in the cell hybrids was examined. Nuclear proteins which bind to the lymphoid enhancer-binding factor 1 (LEF-1) binding motif present in EL4 cells disappeared in the hybrid clones, whereas no significant change was observed in DNA-binding activity of nuclear proteins to a consensus cyclic AMP response element (CRE) and the Ets-1 binding motif between the parental cells and the cell hybrids. No transcripts of the LEF-1 gene were detected in the cell hybrids, despite the retention of the LEF-1 gene and murine chromosomes 3, on which the LEF-1 allele is located, from both parental cells. These results suggest that a trans-acting negative regulatory factor(s) present in fibroblasts suppresses LEF-1 gene expression and that suppression of LEF-1 may lead to the extinction of TCR alpha gene expression in the cell hybrids.

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Selected References

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