Functional and ecological signicance of rDNA intergenic spacer variation in a clonal organism under divergent selection for production rate
نویسندگان
چکیده
Functional and ecological signicance of rDNA intergenic spacer variation in a clonal organism under divergent selection for production rate Elena Gorokhova, Thomas E. Dowling, Lawrence J. Weider, Teresa J. Crease and James J. Elser Department of Biology, Arizona State University, Tempe, AZ 85287-1501, USA The University of Oklahoma Biological Station, HC-71, Box 205, Kingston, OK 73439, USA Department of Zoology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada
منابع مشابه
Functional and ecological significance of rDNA intergenic spacer variation in a clonal organism under divergent selection for production rate.
It has recently been hypothesized that variation in the intergenic spacer (IGS) of rDNA has considerable developmental, evolutionary and ecological significance through effects on growth rate and body C : N : P stoichiometry resulting from the role of the IGS in production of rRNA. To test these ideas, we assessed changes in size and structure of the repetitive region of the IGS, juvenile growt...
متن کاملThe evolution of ribosomal DNA: divergent paralogues and phylogenetic implications.
Although nuclear ribosomal DNA (rDNA) repeats evolve together through concerted evolution, some genomes contain a considerable diversity of paralogous rDNA. This diversity includes not only multiple functional loci but also putative pseudogenes and recombinants. We examined the occurrence of divergent paralogues and recombinants in Gossypium, Nicotiana, Tripsacum, Winteraceae, and Zea ribosomal...
متن کاملDiversity and Inheritance of Intergenic Spacer Sequences of 45S Ribosomal DNA among Accessions of Brassica oleracea L. var. capitata
Ribosomal DNA (rDNA) of plants is present in high copy number and shows variation between and within species in the length of the intergenic spacer (IGS). The 45S rDNA of flowering plants includes the 5.8S, 18S and 25S rDNA genes, the internal transcribed spacer (ITS1 and ITS2), and the intergenic spacer 45S-IGS (25S-18S). This study identified six different types of 45S-IGS, A to F, which at 3...
متن کاملStructural and functional characterization of the intergenic spacer region of the rDNA in Daucus carota.
The intergenic spacer (IGS) region of rDNA in Daucus carota contains at least eight kinds of repeated sequence. One sequence may act as a genuine initiation site for a stable transcript and another may act as a spacer promoter that may be an entry site for proteins required for transcription.
متن کاملRibosomal RNA Genes Contribute to the Formation of Pseudogenes and Junk DNA in the Human Genome
Approximately 35% of the human genome can be identified as sequence devoid of a selected-effect function, and not derived from transposable elements or repeated sequences. We provide evidence supporting a known origin for a fraction of this sequence. We show that: 1) highly degraded, but near full length, ribosomal DNA (rDNA) units, including both 45S and Intergenic Spacer (IGS), can be found a...
متن کامل