Zebrafish may harbour human illness cure
Washington: A new study has highlighted the importance of zebrafish as a model organism for human disease research.
Researchers demonstrated that 70 per cent of protein-coding human genes are related to genes found in the zebrafish and that 84 per cent of genes known to be associated with human disease have a zebrafish counterpart.
The team developed a high-quality annotated zebrafish genome sequence to compare with the human reference genome. Only two other large genomes have been sequenced to this high standard: the human genome and the mouse genome. The completed zebrafish genome will be an essential resource that drives the study of gene function and disease in people.
At first glance, Zebrafish may seem to be a strange comparator to humans, but like us they are vertebrates and we share a common ancestor. They are remarkably biologically similar to people and share the majority of the same genes as humans, making them an important model for understanding how genes work in health and disease.
"This genome will allow researchers to understand how our genes work and how genetic variants can cause disease in ways that cannot be easily studied in humans or other organisms," said Dr Derek Stemple, senior author from the Wellcome Trust Sanger Institute.
Zebrafish research has already led to biological advances in cancer and heart disease research, and is advancing our understanding of muscle and organ development. Zebrafish have been used to verify the causal gene in muscular dystrophy disorders and also to understand the evolution and formation of melanomas or skin cancers .
The zebrafish genome has some unique features, not seen in other vertebrates. They have the highest repeat content in their genome sequences so far reported in any vertebrate species: almost twice as much as seen in their closest relative, the common carp. Also unique to the zebrafish, the team identified chromosomal regions that influence sex determination.
The zebrafish genome contains few pseudogenes - genes thought to have lost their function through evolution - compared to the human genome. The team identified 154 pseudogenes in the zebrafish genome, a fraction of the 13,000 or so pseudogenes found in the human genome.
"This genome will help to uncover the biological processes responsible for common and rare disease and opens up exciting new avenues for disease screening and drug development," Dr Stemple added.