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Related Concept Videos

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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Updated: Jan 7, 2026

A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
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Candidate orphan genes: Reassessing uniqueness.

Sheetalpreet K Maan1,2,3,4, Xuan Y Butzin1,2,3,4, Steven X Ge2,5

  • 1Department of Biology and Microbiology, South Dakota State University, Brookings, South Dakota, United States of America.

Plos One
|December 31, 2025
PubMed
Summary
This summary is machine-generated.

The prevalence of orphan genes in bacteria has been overestimated due to limited genomic data. Reanalysis shows an 81% decrease, suggesting many are not truly unique and should be labeled as 'candidate' or 'putative' genes.

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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Orphan genes lack homologs outside a taxonomic unit, posing challenges to evolutionary models.
  • They are implicated in lineage-specific traits, virulence, and adaptation.
  • Previous estimates of orphan gene prevalence may be inflated due to limited data.

Purpose of the Study:

  • To re-evaluate the prevalence of orphan genes in bacteria using an updated dataset.
  • To reassess the evolutionary origins and taxonomic distribution of previously identified orphan genes.
  • To propose revised annotation standards for genes with apparent uniqueness.

Main Methods:

  • Analysis of a comprehensive 2023 dataset of bacterial genes from over 80,000 species.
  • Homology-based analyses to determine gene distribution across broader genomic landscapes.
  • Application of computational filters to identify high-confidence candidate proteins.

Main Results:

  • Reassessment revealed an 81% decrease in the number of orphan genes within two years.
  • Many previously classified orphan genes were found to have homologs in other bacterial taxa.
  • The study identified a refined, high-confidence subset of candidate genes for further validation.

Conclusions:

  • The prevalence of bacterial orphan genes has been significantly overestimated.
  • Orphan genes should be annotated as 'candidate' or 'putative' to reflect their provisional status.
  • This study provides a refined dataset and annotation recommendations for future research.