G-quadruplex structure of the C. elegans telomeric repeat: a two tetrads basket type conformation stabilized by a non-canonical C–T base-pair - Archive ouverte HAL Access content directly
Journal Articles Nucleic Acids Research Year : 2022

G-quadruplex structure of the C. elegans telomeric repeat: a two tetrads basket type conformation stabilized by a non-canonical C–T base-pair

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Abstract

The Caenorhabditis elegans model has greatly contributed to the understanding of the role of G-quadruplexes in genomic instability. The GGCTTA repeats of the C. elegans telomeres resemble the GGGTTA repeats of the human telomeres. However, the comparison of telomeric sequences (Homo sapiens, Tetrahymena, Oxytricha, Bombyx mori and Giardia) revealed that small changes in these repeats can drastically change the topology of the folded G-quadruplex. In the present work we determined the structure adopted by the C. elegans telomeric sequence d[GG(CTTAGG)3]. The investigated C. elegans telomeric sequence is shown to fold into an intramolecular two G-tetrads basket type G-quadruplex structure that includes a C–T base pair in the diagonal loop. This work sheds light on the telomeric structure of the widely used C. elegans animal model.
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Dates and versions

inserm-03807354 , version 1 (09-10-2022)

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Julien Marquevielle, Aurore de Rache, Brune Vialet, Estelle Morvan, Jean-Louis Mergny, et al.. G-quadruplex structure of the C. elegans telomeric repeat: a two tetrads basket type conformation stabilized by a non-canonical C–T base-pair. Nucleic Acids Research, 2022, 50 (12), pp.7134-7146. ⟨10.1093/nar/gkac523⟩. ⟨inserm-03807354⟩
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