By Lex E. Flagel, Benjamin K. Blackman (auth.), Jonathan F. Wendel, Johann Greilhuber, Jaroslav Dolezel, Ilia J. Leitch (eds.)
In this well timed new 2-volume treatise, specialists from world wide have banded jointly to supply a first-of-its-kind synopsis of the intriguing and fast paced box of plant evolutionary genomics. In quantity I of Plant Genome variety, an replace is equipped on what now we have discovered from plant genome sequencing initiatives. this can be by way of extra targeted chapters at the a number of genomic “residents” of plant genomes, together with transposable components, centromeres, small RNAs, and the evolutionary dynamics of genes and non-coding sequences. realization is attracted to advances in our realizing of plant mitochondrial and plastid genomes, in addition to the importance of duplication in genic evolution and the non-independent evolution between sequences in plant genomes. eventually, quantity I offers an creation to the colourful new frontier of plant epigenomics, describing the present country of our wisdom and the evolutionary implications of the epigenomic landscape.
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Extra info for Plant Genome Diversity Volume 1: Plant Genomes, their Residents, and their Evolutionary Dynamics
Example text
In the “insertion model”, there is weaker selection against TEs in gene-poor regions due to the decreased possibility of deleterious insertions, resulting in higher TE abundance in these regions. The “ectopic recombination model” postulates that TEs accumulate in regions of low recombination because ectopic recombination between copies, which is a powerful deletional force, is less frequent in these regions than in regions with high recombination rate (Langley et al. 1988). The accumulation of TEs in non-recombining regions has been observed empirically on the Y chromosome of humans (Erlandsson et al.
This scenario has been documented at least once in Drosophila (Tsubota and Huong 1991), but to our knowledge, never in plants. SINEs represent another atypical category of nonautonomous elements that derive from non-coding genes transcribed by RNA polymerase III (pol III), most commonly tRNA genes (Deragon and Zhang 2006). The simplest SINE families are equivalent to amplified tRNA retrogene families, which apparently result from accidental trans-recognition by the enzymatic machinery of autonomous LINEs.
Cell 38:471–481 Lippman Z, Gendrel AV, Black M, Vaughn MW, Dedhia N, McCombie WR, Lavine K, Mittal V, May B, Kasschau KD et al (2004) Role of transposble elements in heterochromatin and epigenetic control. Nature 430:471–476 Liu Z, Moore PH, Ma H, Ackerman CM, Ragiba M, Yu Q, Pearl HM, Kim MS, Charlton JW, Stiles JI et al (2004) A primitive Y chromosome in papaya marks incipient sex chromosome evolution. Nature 427:348–352 Liu Z, Yue W, Li D, Wang RR, Kong X, Lu K, Wang G, Dong Y, Jin W, Zhang X (2008) Structure and dynamics of retrotransposons at wheat centromeres and pericentromeres.