Function
In C. elegans, SmY RNAs copurify with spliceosome and with Sm, SL75p, and SL26p proteins, while the better-characterized C. elegans SL1 trans-splicing snRNA copurifies in a complex with Sm, SL75p, and SL21p (a paralog of SL26p). Loss of function of either SL21p or SL26p individually causes only a weak cold-sensitive phenotype, whereas knockdown of both is lethal, as is a SL75p knockdown. Based on these results, the SmY RNAs are believed to have a function in trans-splicing.
Read more about this topic: Sm Y RNA
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