SnRNP-Dependent Splicing of Pre-MRNA Is Thought to Have Evolved from the Self-Splicing

question 38

Essay

snRNP-dependent splicing of pre-mRNA is thought to have evolved from the self-splicing properties inherent in the sequence of either group I or II introns.Alternative splicing of pre-mRNAs processed by spliceosomes has been demonstrated,whereas this phenomenon does not occur in RNA transcripts that undergo self-splicing.Explain this difference.

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