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. 1989 Sep;9(9):3771–3776. doi: 10.1128/mcb.9.9.3771

Hematopoietic lineage-specific heterogeneity in the 5'-terminal region of the chicken proto-myb transcript.

W K Kim 1, M A Baluda 1
PMCID: PMC362438  PMID: 2550801

Abstract

Comparison of the nucleotide sequence of the upstream c-myb exon UE3 with the sequences of a thymus c-myb cDNA and of a B-lymphoma c-myb cDNA suggested the existence of T- and B-cell-specific heterogeneity in the 5'-terminal region of the c-myb coding sequence. This possibility was investigated with T-cell-specific and B-cell-specific DNA probes in a Northern (RNA) blot analysis of mRNAs from different hematopoietic cell types and from chicken embryo fibroblasts. The hematopoietic tissues analyzed were bone marrow, bursa of Fabricius, and thymus from 1-day-old chicks, 13-day yolk sac, and spleen from 16-day embryos. At least three different c-myb mRNA species were found to have 5'-terminal heterogeneity that was specific for either B cells, T cells, or the other hematopoietic cells and chicken embryo fibroblasts. This lineage-specific heterogeneity in the c-myb transcript was found to be expressed in the bone marrow precursors of B and T cells before they migrated to their definitive differentiation sites. S1 nuclease protection analysis of the UE3 exon, part of which appeared to be coding sequences for thymic c-myb mRNA, revealed that this exon is utilized either in its entirety or partially in a cell-lineage-specific manner by all six tissues analyzed. Also, the 5'-terminal exon(s) present in the thymus cDNA was absent in c-myb mRNAs from the other cell types analyzed.

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Selected References

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