Can donor splice site recognition occur without the involvement of U1 snRNP?

Abstract excerpt

Many disease-causing mutations affecting donor splice site recognition are reported in the literature. One of the more frequently observed nucleotide changes causing aberrant splicing are due to mutations in the donor splice site which lower the strength of base pairing with U1 snRNA (small nuclear RNA). However, recent data have highlighted the possibility of a recognition mechanism for weak donor splice sites...

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