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RefSeq curation and annotation of stop codon recoding in vertebrates.

Bhanu Rajput1, Kim D Pruitt1, Terence D Murphy1

  • 1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda, MD 20894, USA.

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Summary
This summary is machine-generated.

Stop codons can specify amino acids, enabling protein extension. This study provides curated datasets for selenoproteins and stop codon readthrough (SCR) isoforms, improving gene annotation accuracy.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Bioinformatics

Background:

  • Stop codons normally terminate protein synthesis but can be recoded.
  • This recoding allows C-terminal protein extension via selenocysteine (Sec) incorporation or stop codon readthrough (SCR).
  • Existing computational tools misannotate these recoded events, necessitating manual curation.

Purpose of the Study:

  • To create accurate, curated datasets of selenoprotein and SCR gene/protein records.
  • To establish annotation standards for recoded gene products.
  • To facilitate research in basic and biomedical sciences.

Main Methods:

  • Manual curation of gene annotations across nine vertebrate model organisms.
  • Integration of curated data into the NCBI Reference Sequence (RefSeq) database.
  • Distinguishing between stop codons functioning as terminators versus sense codons.

Main Results:

  • Successfully curated 247 selenoprotein genes encoding 322 selenoproteins.
  • Identified 93 genes exhibiting stop codon readthrough (SCR), encoding 94 SCR isoforms.
  • Established standardized annotations for these recoded gene products.

Conclusions:

  • Accurate annotation of selenoproteins and SCR isoforms is crucial for understanding their roles.
  • The curated RefSeq datasets serve as essential standards for researchers.
  • Improved annotation will advance basic and biomedical research on protein recoding.