Small nuclear RNA

Small nuclear RNA

Small nuclear RNA (snRNA) is a class of small RNA molecules that are found within the nucleus of eukaryotic cells. They are transcribed by RNA polymerase II or RNA polymerase III and are involved in a variety of important processes such as RNA splicing (removal of introns from hnRNA), regulation of transcription factors (7SK RNA) or RNA polymerase II (B2 RNA), and maintaining the telomeres. They are always associated with specific proteins, and the complexes are referred to as small nuclear ribonucleoproteins (snRNP) or sometimes as snurps. These elements are rich in uridine content.

A large group of snRNAs are known as small nucleolar RNAs (snoRNAs). These are small RNA molecules that play an essential role in RNA biogenesis and guide chemical modifications of ribosomal RNAs (rRNAs) and other RNA genes (tRNA and snRNAs). They are located in the nucleus and the cajal bodies of eukaryotic cells (the major sites of RNA synthesis).

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  • small nuclear RNA — small nuclear RNA. = snurps (см.). (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • small nuclear RNA — small nuclear RNA. См. малые ядерные РНК. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • small nuclear RNA — small nuclear RNA, snRNA ⇒ Ribonucleinsäure …   Deutsch wörterbuch der biologie

  • small nuclear RNA — (snRNA) any of an abundant class of small RNA molecules found in the nucleus in eukaryotes; five uracil rich snRNA s (U1, U2, U4, U5, U6) occur complexed with proteins as small nuclear ribonucleoproteins (snRNP s) and play a role in… …   Medical dictionary

  • small nuclear RNA — Abbreviation: snRNA RNA transcripts of 100 300 bp that associate with proteins to form small nuclear ribonucleoprotein particles. Most snRNAs are components of the spliceosomes …   Glossary of Biotechnology

  • small nuclear RNA — (= snRNA) Abundant class of RNA found in the nucleus of eukaryotes, usually including those RNAs with sedimentation coefficients of 7s or less. They are about 100 300 nucleotides long. Although 5s rRNA and tRNA are of a similar size, they are not …   Dictionary of molecular biology

  • U2 small nuclear RNA auxiliary factor 1 — U2 small nuclear RNA auxiliary factor 1, also known as U2AF1, is a human gene.cite web | title = Entrez Gene: U2AF1 U2 small nuclear RNA auxiliary factor 1| url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene Cmd=ShowDetailView… …   Wikipedia

  • U7 small nuclear RNA — The U7 small nuclear RNA (U7 snRNP) is an RNA molecule involved in the splicing of animal histone pre mRNAs, which are spliced by a different mechanism than nuclear pre mRNAs and self splicing introns. The 5 end of U7 RNA is thought to base pair… …   Wikipedia

  • Small nucleolar RNA U2-19 — is a non coding RNA (ncRNA) molecule which functions in the modification of other small nuclear RNAs (snRNAs). This type of modifiying RNA is usually located in the nucleolus of the eukaryotic cell which is a major site of snRNA biogenesis. It is …   Wikipedia

  • Small nucleolar RNA U2-30 — is a non coding RNA (ncRNA) molecule which functions in the modification of other small nuclear RNAs (snRNAs). This type of modifiying RNA is usually located in the nucleolus of the eukaryotic cell which is a major site of snRNA biogenesis. It is …   Wikipedia

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