Naslov
Evolutionary dynamics of satellite DNAs in some coleopteran genera

Autori
Ugarković, Đurđica ; Mravinac, Brankica ; Bruvo, Branka ; Meštrović, Nevenka ; Plohl, Miroslav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
9th Congress of the European Society for Evolutionary Biology : Book of Abstracts / Butlin, Roger - Leeds : Leeds University, 2003, 522-522

Skup
9th Congress of the European Society for Evolutionary Biology

Mjesto i datum
Leeds, Ujedinjeno Kraljevstvo, 18.08.2003. - 24.08.2003

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
satellite DNA; evolution; Tenebrionidae

Sažetak
Different satellite DNAs coexist in the genome forming a set called the satellite DNA library. Within a library satellite DNAs evolve in nucleotide sequence and in copy number. We have studied the evolutionary dynamics of two different satellites PRAT and PMON in the genera <i>Palorus</i> and <i>Pimelia</i> (Tenebrionidae, Coleoptera). PRAT is present as a highly abundant satellite in the species <i>Palorus ratzeburgii</i> and as a low copy number satellite in other congeneric species. This satellite is also detected in species from the related genera <i>Tenebrio</i> and <i>Tribolium</i> as well as in the more distant genus <i>Pimelia</i>. The comparison of PRAT sequences from different species reveals a high degree of sequence conservation. The mutations profiles are very similar, containing mostly ancestral mutations while species specific mutations are absent even in <i>Pimelia</i> species, although the genera <i>Palorus</i> and <i>Pimelia</i> are separated by 50-60 Myr. The other satellite family, PMON, is spread among all tested <i>Pimelia</i> species ranging from highly abundant to low copy number sequence. The PMON sequence is diverging gradually, mostly due to the accumulation of single point mutations. These mutations are not fixed at the level of species but are species-group specific. The PMON satellite is not detected outside of the genus <i>Pimelia</i> probably due to sequence divergence beyond recognition. The results reveal that the two satellite DNAs coexisting in some of the species behave as mutually independent evolutionary units, exhibiting different dynamics of sequence change. The dynamics of sequence change seems to be independent of the host species: PRAT satellite sequence is conserved between the analysed species, while PMON is accumulating changes gradually following species phylogeny. The observed high sequence conservation of the PRAT satellite might be induced by a bias of turnover mechanisms, or could indicate functional constraints.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

POVEZANOST RADA