title: G-quadruplex structures: in vivo evidence and function.
abstract: Although many biochemical and structural studies have demonstrated that DNA sequences containing runs of adjacent guanines spontaneously fold into G-quadruplex DNA structures in vitro, only recently has evidence started to accumulate for their presence and function in vivo. Genome-wide analyses have revealed that functional genomic regions from highly divergent organisms are enriched in DNA sequences with G-quadruplex-forming potential, suggesting that G-quadruplexes could provide a nucleic-acid-based mechanism for regulating telomere maintenance, as well as transcription, replication and translation. Here, we review recent studies aimed at uncovering the in vivo presence and function of G-quadruplexes in genomes and RNA, with a particular focus on telomeric G-quadruplexes and how their formation and resolution is regulated to permit telomere synthesis.
authors: Institute of Cell Biology, University Witten/Herdecke, Stockumer Str. 10, 58448 Witten, Germany.
authors: Hans J
authors: HJ
authors: Lipps
authors: Daniela
authors: D
authors: Rhodes
mesh_terms: D001483:Base Sequence; D004247:DNA / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D054856:G-Quadruplexes; D006801:Humans; D012313:RNA / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D016615:Telomere / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D012313:RNA; D004247:DNA