Yeast snR30 is a small nucleolar RNA required for 18S rRNA synthesis. A yeast nucleolar protein related to mammalian fibrillarin is associated with small nucleolar RNA and is essential for viability. Sequence and genetic analysis of a dispensible 189 nucleotide snRNA from Saccharomyces cerevisiae . Deletion of a yeast small nuclear RNA gene impairs growth. A U4-like small nuclear RNA is dispensable in yeast.
Yeast contains small nuclear RNAs encoded by single copy genes.
Nop5p is a small nucleolar ribonucleoprotein component required for pre-18S rRNA processing in yeast.