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Analysis of expressed sequence tags indicates 35,000 human genes
1Department of Molecular Biotechnology, University of Washington, Seattle, Washington, USA.
Nature Genetics
|June 3, 2000
Summary
Human gene count is estimated at approximately 35,000, lower than previously thought. This suggests vertebrate complexity evolved through gene regulation and splicing, not just increased gene numbers.
Area of Science:
- Genomics
- Molecular Biology
- Evolutionary Biology
Background:
- The number of protein-coding genes is a key indicator of molecular complexity.
- Gene counts in single-celled organisms range from a few thousand, while multicellular organisms show higher numbers.
Purpose of the Study:
- To estimate the number of human protein-coding genes.
- To compare human gene count with other organisms and understand evolutionary implications.
Main Methods:
- Comparing human expressed sequence tag (EST) contigs with human chromosome 22.
- Comparing human EST contigs with a non-redundant set of mRNA sequences.
Main Results:
- Two independent comparisons yielded consistent estimates of approximately 35,000 human genes.
- This estimate is substantially lower than many prior estimations.
Conclusions:
- Vertebrate physiological complexity may arise more from regulatory network diversification and alternative splicing than a significant increase in gene count.
- The study refines our understanding of human gene number and its evolutionary significance.