Article Dans Une Revue Cold Spring Harbor Symposia on Quantitative Biology Année : 2006

Biogenesis and intranuclear trafficking of human box C/D and H/ACA RNPs.

Résumé

Box C/D and H/ACA snoRNAs represent two abundant groups of small noncoding RNAs. The majority of box C/D and H/ACA snoRNAs function as guide RNAs in the site-specific 2'-O-methylation and pseudouridylation of rRNAs, respectively. The box C/D snoRNAs associate with fibrillarin, Nop56, Nop58, and 15.5K/NHPX proteins to form functional snoRNP particles, whereas all box H/ACA snoRNAs form complexes with the dyskerin, Nop10, Nhp2, and Gar1 snoRNP proteins. Recent studies demonstrate that the biogenesis of mammalian snoRNPs is a complex process that requires numerous trans-acting factors. Most vertebrate snoRNAs are posttranscriptionally processed from pre-mRNA introns, and the early steps of snoRNP assembly are physically and functionally coupled with the synthesis or splicing of the host pre-mRNA. The maturing snoRNPs follow a complicated intranuclear trafficking process that is directed by transport factors also involved in nucleocytoplasmic RNA transport. The human telomerase RNA (hTR) carries a box H/ACA RNA domain that shares a common Cajal-body-specific localization element with a subclass of box H/ACA RNAs, which direct pseudouridylation of spliceosomal snRNAs in the Cajal body. However, besides concentrating in Cajal bodies, hTR also accumulates at a small, structurally distinct subset of telomeres during S phase. This suggests that a cell-cycle-dependent, dynamic localization of hTR to telomeres may play an important regulatory role in human telomere synthesis.

Dates et versions

hal-00309024 , version 1 (05-08-2008)

Identifiants

Citer

T. Kiss, E. Fayet, Beáta E Jády, Patrick Richard, Michel J Weber. Biogenesis and intranuclear trafficking of human box C/D and H/ACA RNPs.. Cold Spring Harbor Symposia on Quantitative Biology, 2006, 71, pp.407-17. ⟨10.1101/sqb.2006.71.025⟩. ⟨hal-00309024⟩
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