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  • Title: v-erbA specifically suppresses transcription of the avian erythrocyte anion transporter (band 3) gene.
    Author: Zenke M, Kahn P, Disela C, Vennström B, Leutz A, Keegan K, Hayman MJ, Choi HR, Yew N, Engel JD.
    Journal: Cell; 1988 Jan 15; 52(1):107-19. PubMed ID: 2830979.
    Abstract:
    Previous work has established that the v-erbA oncogene inhibits the temperature-induced differentiation of chick erythroblasts transformed with temperature-sensitive oncogene mutants. Here we demonstrate that v-erbA in differentiating erythroblasts specifically arrests expression of the erythrocyte anion transporter (band 3) gene at the transcriptional level. The v-erbA-induced differentiation block can be overcome by inducing cells to differentiate at alkaline pH. Under these conditions, which possibly impair biological activity of v-erbA, the maturing cells now express the anion transporter gene at high levels. However, its transcription is specifically and rapidly suppressed if v-erbA activity is restored by culturing the cells at neutral pH. Similar but less pronounced inhibition of gene expression by v-erbA was observed for the delta-amino-levulinic acid synthase gene. Additional evidence obtained with an inhibitor of band 3 activity suggests that the v-erbA-induced inhibition of band 3 gene expression is at least partly responsible for the differentiation block caused by this oncogene.
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