Recorded: 16 May 2004
The biggest change that happened in my time in science, in molecular biology, has been, I think, two things; one is polymerase chain reaction, they are both technical things. The polymerase chain reaction made a big difference to what people can do and it’s still making a difference now. And the other thing is high throughput sequencing and that has just revolutionized how people can collect data. That’s a huge change. I can remember running radioactive sequencing gels as a graduate student and of course nobody has to do that stuff anymore.
So now virtually everybody has some kind of sequencing service, so you give your sequences that you want to the service and you get them back on the computer the next day, so it’s made a huge difference in the way people work.
Working at the Sanger Centre, Dunham heads the team, which sequenced human chromosome 22. He is interested in uses of human chromosome 22 as a model system for genomic analysis. Chromosome 22 represents about 1% of the whole genome but is a relatively gene rich chromosome. As such it is a tractable model system for a number of genome-wide studies.
Dunham’s initial work was in comprising physical maps in yeast artificial chromosomes (YACs) to produce an extensive YAC map, which served as the backbone for future production of the DNA sequence.
From 1996-1999 he focused on bringing the sequencing of human chromosome 22 to completion. This was achieved with the publication of the completed sequence and its analysis (Dunham et al. 1999). At the same time the group was responsible for establishing a benchmark level of gene annotation on the sequence. Currently chromosome 22 represents the best-annotated region of the human genome, and provides an excellent model system to develop functional genomic approaches. He was the leader of the consortium of four sequencing groups and numerous collaborators.
His team’s future research interests build on the knowledge of human chromosome 22 as a defined subset of the human genome to develop approaches to studying gene expression and networks at the mRNA and protein level. These include microarray expression analysis, cloning of tagged genes and expression of their proteins, development of phage antibody resources, and study of protein intracellular localization.
Dunham was formerly a Research Fellow and a Postdoctoral Research Fellow at Guys Campus in London.
The BBC interviewed Dunham:
Computer modeling suggests there may be as many as 1,000 genes on chromosome 22, but even this is but a small fraction of the estimated 60,000 to 100,000 genes in our cells.
Human disorders "One down, the others to go," said Ian Dunham, a biochemist at the Sanger Centre in Cambridge, UK, and lead author on the scientific paper in the journal Nature that announces the genetics landmark. "It's a great relief to have it finished."
Mutations to genes along chromosome 22 contribute to heart defects, immune system disorders, cancers, and mental retardation. A gene linked to schizophrenia is also thought to reside somewhere on chromosome 22.