ArticleBMC molecular biology2007
The promoter regions of the Myb-regulated Adora2B and Mcm4 genes co-localize with origins of DNA replication.
Article in BMC molecular biology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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3 authors at 1 institution in 2 countries.
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Abstract
backgroundThe retroviral oncogene v-myb encodes a transcription factor (v-Myb) which is responsible for the transformation of myelomonocytic cells by avian myeloblastosis virus (AMV). v-Myb is thought to exert its biological effects by deregulating the expression of specific target genes. We have recently demonstrated that the chicken Gas41 gene, whose promoter co-localizes with an origin of DNA replication, is a bona fide Myb target gene. Because of this finding we have asked whether other Myb-regulated genes are also associated with DNA replication origins.
resultsWe show that the promoter region of the chicken adenosine receptor 2B gene (Adora2B), a known Myb-target gene, acts as a DNA replication origin. Furthermore, we have examined known replication origins for the presence of Myb binding sites. We found that the intergenic region between the genes for the minichromosome maintenance 4 protein (Mcm4) and the catalytic subunit of DNA-dependent protein kinase (Prkdc), whose human counterpart has been identified as a replication origin, contains a number of Myb binding sites. Our data show that this region also acts as an origin of replication in chicken cells. Interestingly, we found that the chicken Mcm4 gene is also Myb-regulated.
conclusionOur work identifies the chicken Mcm4 gene as a novel Myb target gene and presents evidence for the co-localization of two novel origins of DNA replication with Myb-regulated genes. Our work raises the possibility that a fraction of Myb target gene promoters is associated with DNA replication origins.
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