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Embryology study offers clues to birth defects
Date:6/9/2009

is only produced by certain cells at precise stages of development.

In the study, the team of scientists showed that mice missing the Raldh2 and Raldh3 genes, which normally die early and do not develop limbs, could be rescued by treatment with a small dose of retinoic acid. However, forelimb development was stunted, suggesting that retinoic acid is required for forelimb but not hindlimb development. In zebrafish, the forelimb (pectoral fin) is also missing in retinoic acid-deficient embryos, but they were able to rescue fin development by treating such embryos with a drug that reduces fibroblast growth factor activity, thus supporting the hypothesis that retinoic acid normally reduces this activity.

By providing a more complete understanding of the molecular mechanisms involved in normal limb development, these findings may lead to new therapeutic or preventative measures to combat congenital limb defects, such as Holt-Oram syndrome, a birth defect characterized by upper limb and heart defects.


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Contact: Josh Baxt
jbaxt@burnham.org
858-795-5236
Burnham Institute
Source:Eurekalert

Page: 1 2

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