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Related Concept Videos

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Researchers have expanded the catalog of human non-canonical open reading frames (ncORFs), identifying over 28,000 ncORFs. A curated subset of 10,000 ncORFs shows translation evidence comparable to protein-coding genes, enhancing biomedical research potential.

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Area of Science:

  • Genomics
  • Proteomics
  • Bioinformatics

Background:

  • Non-canonical open reading frames (ncORFs) were previously omitted from genome annotations, hindering their use in research despite evidence of translation.
  • The initial 2022 catalog of human ncORFs lacked a standardized framework for assessing translation evidence.

Purpose of the Study:

  • To present an expanded and refined catalog of human ncORFs.
  • To establish a data-driven framework for evaluating translation evidence in ncORFs.
  • To provide a high-quality reference set of ncORFs for downstream research.

Main Methods:

  • Incorporated additional datasets and relaxed constraints on ORF length and start codons.
  • Developed a translation signature score framework to quantify evidence of translation.
  • Defined a primary set of ncORFs with translation evidence comparable to canonical genes.

Main Results:

  • Identified a comprehensive set of 28,359 human ncORFs, nearly four times larger than the previous catalog.
  • Derived a primary set of 10,127 ncORFs with robust translation evidence.
  • The primary set serves as a reliable reference for analyses requiring high-quality ncORF data.

Conclusions:

  • The updated ncORF catalog significantly expands the resource for the research community.
  • The translation signature score framework enables reliable assessment of ncORF translation evidence.
  • This work facilitates the integration of ncORFs into mainstream biomedical research and future annotation efforts.