hnRNP A1 is a member of A/B subfamily of heterogeneous nuclear ribonucleoproteins (hnRNPs). The hnRNPs are RNA binding proteins and they complex with heterogeneous nuclear RNA (hnRNA). hnRNP A1 is involved in the packaging of premature mRNA into hnRNP particles and transport of poly(A) mRNA from the nucleus to the cytoplasm. hnRNP A1 has been characterized as a component of protein complexes bound to premature mRNA (hnRNP complexes). hnRNP A1 is one of the most abundant and best-characterized components of hnRNP complexes. Human hnRNP functions also in telomere length regulation and miRNA biogenesis. It may play a role in the replication of RNA viruses.
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