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Critical Reviews™ in Eukaryotic Gene Expression
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ISSN Imprimir: 1045-4403
ISSN En Línea: 2162-6502

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Critical Reviews™ in Eukaryotic Gene Expression

DOI: 10.1615/CritRevEukarGeneExpr.v9.i2.20
pages 107-158

Nuclear snRNA and Nuclear Function (Discovery of 5′ Cap Structures in RNA)

Tae Suk Ro-Choi
Department of Pharmacology, Baylor College of Medicine, Houston, TX 77030

SINOPSIS

In view of the fact that eukaryotic gene expression starts in the nucleus, it is important to have a thorough understanding of nuclear macromolecular structure and function. Newly discovered snRNAs are eukaryotic cell specific and have unique subnuclear compartmental localizations. There are over 200 nucleolar-specific RNAs that include some abundant U3, U8, and U13 RNAs. Extranucleolar-nuclear-specific RNAs (snRNA) are 4.5S RNA I, II, III, 5S RNA III, Ul, U2, U4, U5, and U6, in addition to over 500 different RNA species reported up to now. In particular, some snoRNAs and snRNAs have trimethylguanosine cap structures that are not present in bacteria. They have crucial roles in gene expression, such as transcription (U3 snoRNA), processing (U3, U8, U13, U14, U22, and7-2/MRP), methylation (U14-16, U18, U20-21, andU24-63), pseudouridylation (E2, E3, U19, U23, and U64-72), and hnRNA splicing (Ul, U2, U4, U5, and U6 snRNA).


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