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Minor Classes of RNA - This group of RNA are produced in small amounts and they are not translated nor excessively modified.

snRNA or URNA These RNA molecules are low-molecular weight compound and found in the nucleoplasm. These RNA molecules are rich in uridine residues. Hence they are also called U-RNA. These RNA molecules play an important role in RNA splicing in combination with other proteins.

Till now five snRNA have been discovered-U1, U2, U4, US and U6. These are located in the nucleus. Another U3 has also been discovered which is present in nucleolus. snRNA's size ranges from 100 bases to 215 bases. These snRNAs do not exist as free RNA molecules, but as small nuclear RNA protein complex called snRNPs or small nuclear ribonucleic proteins.

However, the exact protein composition of intact spliceosomes is not established. About 106 copies of snRNA genes are present per cell. snRNA are very stable and are capped by trimethyl guanosme cap.

IRNA These are short sequences used as primers for lagging strand DNA synthesis.

scRNA These are called as small cytoplasmic RNA. They are low molecular weight RNA molecules found in cytoplasm with various functions, e.g. pRNA (Prosomal RNA) a small RNA associated with approximately 20 proteins and found packaged with mRNA in the mRNP.

Telomerase RNA A nuclear RNA which contains the template for telomere repeats and forms part of the enzyme telomerase.

Antisense RNA Antisense RNA is complementary to mRNA and can form a duplex with it to block protein synthesis. Naturally occurring antisense RNA is found in many systems but predominantly in bacteria. These are also called as mRNA interfering complementary RNA or mic RNA.

  

 
   
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