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| Gene could allow lab-grown teeth |
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Wednesday, February 25, 2009
WASHINGTON: Scientists believe they have found a way to grow teeth in the laboratory, a discovery that could put an end to fillings and dentures.
The US team from Oregon have located the gene responsible for the growth of enamel, the hard outer layer of teeth which cannot grow back naturally.
Other scientists are already growing the inner parts of teeth in animals - but they have no hard enamel coatings.
The Proceedings of the National Academy of Sciences work may plug this gap.
Experiments in mice have shown that the gene, a “transcription factor” called Ctip2, has several functions involving immune responses and the development of skin and nerves. A lot of work would still be needed to bring this to human applications, but it should work. The work at Oregon State University made the link with enamel by studying mice bred to lack Ctip2.
Lead researcher Dr Chrissa Kioussi said: “It’s not unusual for a gene to have multiple functions, but before this we didn’t know what regulated the production of tooth enamel.”
The scientists found that Ctip2 was crucial for the enamel-producing cells, called ameloblasts, to form and work properly. Dr Kioussi said: “This is the first transcription factor ever found to control the formation and maturation of ameloblasts, which are the cells that secrete enamel.”
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ISSN 1563-9479 
