نتایج جستجو برای: retrotransposons
تعداد نتایج: 2591 فیلتر نتایج به سال:
In a broad range of taxa, genes can duplicate through an RNA intermediate in a process mediated by retrotransposons (retroposition). In mammals, L1 retrotransposons drive retroposition, but the elements responsible for retroposition in other animals have yet to be identified. Here, we examined young retrocopies from various animals that still retain the sequence features indicative of the under...
Rumex acetosa is a dioecious plant with the XY1Y2 sex chromosome system. Both Y chromosomes are heterochromatic and are thought to be degenerated. We performed low-pass 454 sequencing and similarity-based clustering of male and female genomic 454 reads to identify and characterize major groups of R. acetosa repetitive DNA. We found that Copia and Gypsy retrotransposons dominated, followed by DN...
ABC Fax + 41 61 306 12 34 E-mail [email protected] www.karger.com © 2005 S. Karger AG, Basel 1424–8581/05/1104–0392$22.00/0 Accessible online at: www.karger.com/cgr Abstract. Eukaryotic and prokaryotic genomes encode either Type I or Type II Ribonuclease H (RNH) which is important for processing RNA primers that prime DNA replication in almost all organisms. This review highlights the important ...
Centromeres in eukaryotes are composed of tandem DNAs and retrotransposons. However, centromeric repeats exhibit considerable diversity, even among closely related species, their origin evolution largely unknown. We conducted a genome-wide characterization the sequences sugarcane (Saccharum officinarum). Four repeat sequences, So1, So103, So137 So119, were isolated. So1 has monomeric length 137...
Mobile elements within genomes have driven genome evolution in diverse ways. Particularly in plants and mammals, retrotransposons have accumulated to constitute a large fraction of the genome and have shaped both genes and the entire genome. Although the host can often control their numbers, massive expansions of retrotransposons have been tolerated during evolution. Now mobile elements are bec...
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