Identity elements used in export of mRNAs

Molecular Cell
Mutsuhito OhnoI W Mattaj

Abstract

Different classes of RNA are exported from the nucleus by distinct factors. We demonstrate that U1 snRNA is exported like an mRNA on insertion of a pre-mRNA intron or either sense or antisense mRNA exon sequences. mRNA-specific factors are recruited onto the spliced or elongated U1 RNA whereas U snRNA-specific factors are not, suggesting that an unstructured region of sufficient length in an RNA acts as a dominant determinant of mRNA identity. After export, spliced U1 RNA undergoes cytoplasmic maturation but is not reimported into the nucleus. These data provide insight into mechanisms for discrimination of different classes of nuclear RNA and demonstrate that two RNAs of identical sequence can have distinct cytoplasmic fates depending on their mode of export.

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