XB-ART-46225
Chromosome Res
2012 Dec 01;208:953-69. doi: 10.1007/s10577-012-9320-1.
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Pearls are novel Cajal body-like structures in the Xenopus germinal vesicle that are dependent on RNA pol III transcription.
Nizami ZF
,
Gall JG
.
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We have identified novel nuclear bodies, which we call pearls, in the giant oocyte nuclei of Xenopus laevis and Xenopus tropicalis. Pearls are attached to the lampbrush chromosomes at specific loci that are transcribed by RNA polymerase III, and they disappear after inhibition of polymerase III activity. Pearls are enriched for small Cajal body-specific RNAs (scaRNAs), which are guide RNAs that modify specific nucleotides on splicing snRNAs. Surprisingly, snRNAs themselves are not present in pearls, suggesting that pearls are not functionally equivalent to Cajal bodies in other systems, which contain both snRNAs and scaRNAs. We suggest that pearls may function in the processing of RNA polymerase III transcripts, such as tRNA, 5S rRNA, and other short non-coding RNAs.
???displayArticle.pubmedLink??? 23135638
???displayArticle.pmcLink??? PMC3566365
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???displayArticle.grants??? [+]
R01 GM033397 NIGMS NIH HHS , R01 GM33397 NIGMS NIH HHS , T32 GM007231 NIGMS NIH HHS , P40 OD010997 NIH HHS
Genes referenced: mt-tr trna
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