Centromere and telomere sequence alterations reflect the rapid genome evolution within the carnivorous plant genus Genlisea
Language English Country England, Great Britain Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
26485466
DOI
10.1111/tpj.13058
Knihovny.cz E-resources
- Keywords
- G. hispidula, Genlisea nigrocaulis, Lentibulariaceae, centromeric retrotransposons, centromeric tandem repeat, genome evolution, plant telomeric repeat variants, telomerase,
- MeSH
- Biological Evolution * MeSH
- Time Factors MeSH
- Centromere genetics MeSH
- Chromosomes, Plant genetics MeSH
- Species Specificity MeSH
- Genetic Variation MeSH
- Genome, Plant genetics physiology MeSH
- Magnoliopsida genetics physiology MeSH
- Molecular Sequence Data MeSH
- Base Sequence MeSH
- Telomere genetics MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
Linear chromosomes of eukaryotic organisms invariably possess centromeres and telomeres to ensure proper chromosome segregation during nuclear divisions and to protect the chromosome ends from deterioration and fusion, respectively. While centromeric sequences may differ between species, with arrays of tandemly repeated sequences and retrotransposons being the most abundant sequence types in plant centromeres, telomeric sequences are usually highly conserved among plants and other organisms. The genome size of the carnivorous genus Genlisea (Lentibulariaceae) is highly variable. Here we study evolutionary sequence plasticity of these chromosomal domains at an intrageneric level. We show that Genlisea nigrocaulis (1C = 86 Mbp; 2n = 40) and G. hispidula (1C = 1550 Mbp; 2n = 40) differ as to their DNA composition at centromeres and telomeres. G. nigrocaulis and its close relative G. pygmaea revealed mainly 161 bp tandem repeats, while G. hispidula and its close relative G. subglabra displayed a combination of four retroelements at centromeric positions. G. nigrocaulis and G. pygmaea chromosome ends are characterized by the Arabidopsis-type telomeric repeats (TTTAGGG); G. hispidula and G. subglabra instead revealed two intermingled sequence variants (TTCAGG and TTTCAGG). These differences in centromeric and, surprisingly, also in telomeric DNA sequences, uncovered between groups with on average a > 9-fold genome size difference, emphasize the fast genome evolution within this genus. Such intrageneric evolutionary alteration of telomeric repeats with cytosine in the guanine-rich strand, not yet known for plants, might impact the epigenetic telomere chromatin modification.
References provided by Crossref.org
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Telomeres in Plants and Humans: Not So Different, Not So Similar
Chromosome identification for the carnivorous plant Genlisea margaretae
Telomere- and Telomerase-Associated Proteins and Their Functions in the Plant Cell
