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Chromatin Structure Regulates pre-mRNA Processing02:41

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
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Human histone pre-mRNA assembles histone or canonical mRNA-processing complexes by overlapping 3'-end sequence

Francesco S Ielasi1, Sara Ternifi1, Emeline Fontaine1

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Summary
This summary is machine-generated.

This study reveals how H2AC18 pre-mRNA uses overlapping sequence elements to selectively recruit distinct processing complexes, controlling whether the final mRNA is polyadenylated or not.

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Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro
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Area of Science:

  • Molecular Biology
  • RNA Processing
  • Gene Regulation

Background:

  • Human pre-mRNA processing involves multi-subunit complexes recognizing specific RNA elements.
  • Canonical processing yields polyadenylated mRNA, while replication-dependent histone mRNA processing yields cleaved, non-polyadenylated mRNA.
  • H2AC18 mRNA is unique, capable of producing both polyadenylated and non-polyadenylated forms.

Purpose of the Study:

  • To elucidate the mechanism by which H2AC18 pre-mRNA selects between two distinct processing pathways.
  • To investigate how overlapping cis-acting elements dictate the recruitment of specific pre-mRNA processing complexes.

Main Methods:

  • In vitro analysis of H2AC18 pre-mRNA processing.
  • Mutational disruption of the polyadenylation signal (PAS) and histone downstream element (HDE).
  • Assessing the recruitment of canonical and histone processing machinery.

Main Results:

  • H2AC18 pre-mRNA features an overlapping sequence element that binds both the canonical polyadenylation signal (PAS) and the histone downstream element (HDE).
  • Disrupting the PAS sequence on H2AC18 pre-mRNA abolished canonical complex recruitment in vitro.
  • Histone processing machinery recruitment remained unaffected by PAS disruption, indicating mutually exclusive complex binding.

Conclusions:

  • The relative positioning of cis-acting elements in histone pre-mRNAs enables selective recruitment of distinct processing complexes.
  • This mechanism expands the regulatory capacity for 3' end processing and polyadenylation in gene expression.