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Helitrons and Retrotransposons Are Co-localized in Bos taurus Genomes

[ Vol. 18 , Issue. 3 ]

Author(s):

A. Babii, S. Kovalchuk, T. Glazko, G. Kosovsky and V. Glazko   Pages 278 - 286 ( 9 )

Abstract:


Background: DNA transposons helitrons are mobile genetic elements responsible for major movements of the genetic material within and across different genomes. This ability makes helitrons suitable candidate elements for the development of new approaches of multilocus genotyping of livestock animals, along with the well-known microsatellite loci.

Objective: We aimed to estimate the informativeness of helitron and microsatellite markers in assessing the consolidation and the "gene pool" standards of two commercial dairy cattle breeds (Ayrshire breed and holsteinized Black-and-White cattle) and one local breed of Kalmyk cattle, and to reveal any interbreed difference in the organization of genomic regions flanked by helitrons in the studied cattle breeds.

Method: We used the combination of two highly-polymorphic genomic elements – helitrons and trinucleotide microsatellites (AGC)6G and (GAG)6C, respectively – for genome scanning of the sampled groups of cattle. Also, we pyrosequenced the genomic regions flanked by the inverted repeats of 3'-end of Heligloria family of helitron fragments.

Results: Generally, the both combinations of markers generated polymorphic spectra, based on which certain interbreed differentiation could be observed. The analysis of the identified interspersed repeats suggests that in factory and local cattle the genomic regions flanked by helitron fragments are shaped differently and contain different superfamilies of transposable elements, especially retrotransposons.

Conclusion: Despite the well-known fact of retrotransposon-dependent microsatellite expansion, our data suggest that, in the cattle genome, the DNA transposons and microsatellites can also be found in close neighbourhood, and that helitrons and retrotransposons may form domains of increased variability – targets for factors of artificial selection.

Keywords:

Genome scanning, Helitrons, Bos taurus, Transposable elements, Microsatellites.

Affiliation:

Federal State Budget Scientific Institution Center of Experimental Embryology and Reproductive Biotechnologies, 127422 Russian Federation, Moscow, Kostyakova str., 12, bld.4, Federal State Budget Scientific Institution Center of Experimental Embryology and Reproductive Biotechnologies, Moscow, Federal State Educational Institution of Higher Education Russian State Agrarian University – MAA named after K. A. Timiryazev, Moscow, Federal State Budget Scientific Institution Center of Experimental Embryology and Reproductive Biotechnologies, Moscow, Federal State Educational Institution of Higher Education Russian State Agrarian University – MAA named after K. A. Timiryazev, Moscow

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