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Related Concept Videos

RNA Splicing01:32

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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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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Overview
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Beyond the gene: decoding alternative isoforms.

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This summary is machine-generated.

Most human genes produce multiple mRNA transcripts, leading to diverse protein isoforms. Recent advances show these alternative protein isoforms are common, distinct, and linked to disease, necessitating an isoform-aware approach to molecular biology.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Proteomics

Background:

  • Most human genes express multiple messenger RNA (mRNA) transcripts through mechanisms like alternative splicing.
  • These transcripts can translate into various protein isoforms, but their collective impact on the human proteome has been debated.
  • Functional significance of alternative protein isoforms is known, but their widespread role remains unclear.

Purpose of the Study:

  • To investigate the extent to which alternative mRNA transcripts diversify the human proteome at the protein level.
  • To assess the biochemical distinctness and disease association of these alternative protein isoforms.
  • To advocate for a shift towards isoform-aware characterization in molecular studies.

Main Methods:

  • Utilized long-read RNA sequencing for comprehensive transcript analysis.
  • Employed sensitive proteomics techniques to detect and quantify protein isoforms.
  • Applied high-throughput methods to perturb and study individual isoform functions.

Main Results:

  • Evidence suggests most alternative mRNA transcripts are translated into distinct protein isoforms at the protein level.
  • These protein isoforms exhibit biochemical differences.
  • A significant association between alternative protein isoforms and various diseases was observed.

Conclusions:

  • Alternative protein isoforms play a substantial role in diversifying the human proteome.
  • Technological advancements confirm the prevalence and functional relevance of protein isoforms.
  • Future molecular characterization should adopt an 'isoform-aware' perspective, moving beyond single-gene analysis.