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@article{1373245,
author = {Fulnečková, Jana and Ševčíková, Tereza and Lukešová, Alena and Sýkorová, Eva},
article_location = {New York},
article_number = {3},
doi = {http://dx.doi.org/10.1007/s00412-015-0557-2},
keywords = {Green algae; Telomere evolution; Telomerase activity; TRAP; 18S rDNA phylogeny},
language = {eng},
issn = {0009-5915},
journal = {Chromosoma},
title = {Transitions between the Arabidopsis-type and the human-type telomere sequence in green algae (clade Caudivolvoxa, Chlamydomonadales)},
url = {http://link.springer.com/article/10.1007%2Fs00412-015-0557-2},
volume = {125},
year = {2016}
}
TY - JOUR
ID - 1373245
AU - Fulnečková, Jana - Ševčíková, Tereza - Lukešová, Alena - Sýkorová, Eva
PY - 2016
TI - Transitions between the Arabidopsis-type and the human-type telomere sequence in green algae (clade Caudivolvoxa, Chlamydomonadales)
JF - Chromosoma
VL - 125
IS - 3
SP - 437-451
EP - 437-451
PB - Springer
SN - 00095915
KW - Green algae
KW - Telomere evolution
KW - Telomerase activity
KW - TRAP
KW - 18S rDNA phylogeny
UR - http://link.springer.com/article/10.1007%2Fs00412-015-0557-2
L2 - http://link.springer.com/article/10.1007%2Fs00412-015-0557-2
N2 - Telomeres are nucleoprotein structures that distinguish native chromosomal ends from double-stranded breaks. They are maintained by telomerase that adds short G-rich telomeric repeats at chromosomal ends in most eukaryotes and determines the T(n)A(m)G(o) sequence of canonical telomeres. We employed an experimental approach that was based on detection of repeats added by telomerase to identify the telomere sequence type forming the very ends of chromosomes. Our previous studies that focused on the algal order Chlamydomonadales revealed several changes in telomere motifs that were consistent with the phylogeny and supported the concept of the Arabidopsis-type sequence being the ancestral telomeric motif for green algae. In addition to previously described independent transitions to the Chlamydomonas-type sequence, we report that the ancestral telomeric motif was replaced by the human-type sequence in the majority of algal species grouped within a higher order clade, Caudivolvoxa. The Arabidopsis-type sequence was apparently retained in the Polytominia clade. Regarding the telomere sequence, the Chlorogonia clade within Caudivolvoxa bifurcates into two groups, one with the human-type sequence and the other group with the Arabidopsis-type sequence that is solely formed by the Chlorogonium species. This suggests that reversion to the Arabidopsis-type telomeric motif occurred in the common ancestral Chlorogonium species. The human-type sequence is also synthesized by telomerases of algal strains from Arenicolinia, Dunaliellinia and Stephanosphaerinia, except a distinct subclade within Stephanosphaerinia, where telomerase activity was not detected and a change to an unidentified telomeric motif might arise. We discuss plausible reasons why changes in telomeric motifs were tolerated during evolution of green algae.
ER -
FULNEČKOVÁ, Jana, Tereza ŠEVČÍKOVÁ, Alena LUKEŠOVÁ and Eva SÝKOROVÁ. Transitions between the Arabidopsis-type and the human-type telomere sequence in green algae (clade Caudivolvoxa, Chlamydomonadales). \textit{Chromosoma}. New York: Springer, 2016, vol.~125, No~3, p.~437-451. ISSN~0009-5915. Available from: https://dx.doi.org/10.1007/s00412-015-0557-2.
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