Abstract
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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Abbreviations
- MRE:
-
main regulatory element
- LCR:
-
locus control region
- NaBut:
-
sodium butyrate
- PIC:
-
protease inhibitor cocktail
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Original Russian Text © K.V. Dolgushin, E.S. Iudinkova, N.V. Petrova, S.V. Razin, O.V. Iarovaia, 2015, published in Molekulyarnaya Biologiya, 2015, Vol. 49, No. 3, pp. 498–506.
These authors contributed equally to the work.
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Dolgushin, K.V., Iudinkova, E.S., Petrova, N.V. et al. Joint locus of a/b-globin genes in Danio rerio is segregated into structural subdomains active at different stages of development. Mol Biol 49, 442–449 (2015). https://doi.org/10.1134/S0026893315030048
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DOI: https://doi.org/10.1134/S0026893315030048