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The Journey to smORFland.
Wagied Davids1, Hans-Henrik Fuxelius, Siv G E Andersson
1Department of Molecular Evolution, Evolutionary Biology Center, Uppsala University, Norbyvägen 18C, Uppsala 752 36, Sweden.
Comparative and Functional Genomics
|July 17, 2008
Summary
Many genes in sequenced genomes have unknown functions, termed orphan genes. These may be fragmented ancestral genes, with evidence from Rickettsia species providing insights into their origin and evolution.
Area of Science:
- Genomics
- Evolutionary Biology
- Molecular Biology
Background:
- Genome sequencing has revealed a large number of genes with unknown functions, referred to as orphan genes.
- The evolutionary origin and functional significance of these orphan genes remain largely unexplained.
Purpose of the Study:
- To explore the hypothesis that orphan genes may originate from fragmented ancestral genes.
- To investigate the evolutionary processes that lead to gene fragmentation and loss of similarity.
Main Methods:
- Review of existing genomic data and evolutionary theories.
- Analysis of a case study involving orphan genes in Rickettsia species.
Main Results:
- A hypothesis suggests orphan genes could be remnants of ancestral genes lost through duplication or horizontal gene transfer events.
- Reconstruction of ancestral genes from fragmented orphan genes in Rickettsia was successful.
- One reconstructed gene showed similarity to ankyrin-repeat domain-containing proteins.
Conclusions:
- Fragmented ancestral genes provide a plausible explanation for the existence of numerous orphan genes.
- The study supports the idea that gene fragmentation and subsequent loss of similarity contribute to evolutionary novelty.
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