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. 1983;2(11):1943–1951. doi: 10.1002/j.1460-2075.1983.tb01683.x

Somatic variation of H-2Kk expression and structure in a T-cell lymphoma: instability, stabilization, high production and structural mutation.

B Holtkamp, M Cramer, K Rajewsky
PMCID: PMC555392  PMID: 6196194

Abstract

In the heterozygous T lymphoma line LDHB, variants which have lost the expression of individual H-2 class I genes are spontaneously generated in vitro at a frequency of 10(-1)-10(-2). A cell line (HK13) in which the class I gene Kk is stably expressed (frequency of loss variants less than 10(-4) was selected from LDHB cells by fluorescence activated cell sorting. Further selection of HK13 cells for high Kk expression led to the isolation of the HK22 line which expresses twice as much Kk as HK13. From HK13 and HK22 cells, spontaneous structural variants of Kk having lost individual serological determinants of the Kk wild-type molecule, were isolated by fluorescence activated cell sorting. Such variants occur at a frequency of 10(-6)-10(-7) per cell per generation. The analysis of these variants indicates that they carry mutations in the Kk structural gene and that HK13 cells express a single Kk gene which appears to be duplicated in HK22 cells. We did not find evidence for the generation of variants expressing 'alien' class I products in the LDHB cell line. The instability of class I gene expression in LDHB cells and the transition to stable expression may represent steps of T-cell differentiation in the thymus.

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Selected References

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