SnoRNA Guide Families
The two different types of rRNA modification (methylation and pseudouridylation) are directed by two different families of snoRNPs. These families of snoRNAs are referred to as antisense C/D box and H/ACA box snoRNAs based on the presence of conserved sequence motifs in the snoRNA. There are exceptions but as a general rule C/D box members guide methylation and H/ACA members guide pseudouridylation. The members of each family may vary in biogenesis, structure and function but each family is classified by the following generalised characteristics. For more detail see review. SnoRNAs are classified under small nuclear RNA in MeSH.
Read more about this topic: Small Nucleolar RNA
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