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[Joint locus of a/b-globin genes in Danio rerio is segregated into structural subdomains active at different stages of development].

Mol. Biol. (Mosk.). 2015 May-Jun ;49(3):498-506. doi:10.7868/S0026898415030040
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摘要


In the domain model of eukaryotic genome organization, the functional unit of the genome, along with the relevant regulatory elements, is considered to be a gene or a gene family. In hot-blooded vertebrate animals, the domains of a- and b-globin genes are positioned at different chromosomes and are organized and regulated in different fashion. In cold-blooded animals, in particular in tropical fish Danio rerio, a- and b globin genes are located in a common gene cluster. However, the joint a/b-globin gene cluster is subdivided into two development stage-specific subdomains, the adult one and the embryonic-larval one. In an attempt to find out whether this functional segregation correlates with structural segregation of the domain we compared the DNase I sensitivity and profiles of histone modifications of adult and embryonic-larval segments of the domain in cultured D. rerio fibroblasts. We have demonstrated that, in these nonerythroid cells, adult and embryonic- larval subdomains possess different DNase I sensitivities and different profiles of H3K27me3, a histone modification introduced by PRC2 complex. These observations suggest that joint a/b globin gene domain of Danio rerio is segregated into two structural subdomain harboring adult and embryonic-larval globin genes.

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