Functionally enigmatic genes: a case study of the brain ignorome.

Area of Science:

• Genomics
• Neuroscience
• Bioinformatics

Background:

• Many genes with specific tissue expression are functionally uncharacterized.
• Understanding these genes is crucial for biological insights.

Purpose of the Study:

• To define and analyze the 'ignorome' – genes with intense, selective expression but unknown function.
• To investigate differences between ignorome genes and well-studied genes.
• To explore methods for high-throughput functional annotation of ignorome genes.

Main Methods:

• Computational approach to identify ignorome genes.
• Analysis of publication data and literature bias.
• Examination of gene properties like network connectivity, orthologs, and protein domains.
• Evaluation of genomic, imaging, and phenotype datasets for functional annotation.

Main Results:

• A substantial subset of genes with intense, selective brain expression are functionally enigmatic.
• Research focus is skewed, with a small fraction of genes receiving most attention.
• The ignorome is persistent despite advances in neuroscience literature.
• Ignorome genes do not differ from well-studied genes in network connectivity, orthologs, or domains.
• Early discovery date is the primary factor influencing research momentum ('genomic bandwagon effect').
• High-throughput data successfully provided functional information for many ignorome genes.

Conclusions:

• The 'genomic bandwagon effect' significantly impacts research focus on functionally enigmatic genes.
• Computational and large-scale data approaches can effectively annotate the ignorome.
• Further research is needed to fully characterize the biological roles of these neglected genes.