Master Gene Controls Healing Of "Skin" In Fruit Flies And Mammals

University of California, San Diego biologists and their colleagues have discovered that the genetic system controlling
the development and repair of insect cuticle-the outer layer of the body surface in insects-also controls these processes in
mammalian skin, a finding that could lead to new insights into the healing of wounds and treatment of cancer.


The UCSD biologists' study, published April 15 in the journal Science identifies a master gene called grainyhead that
activates wound repair genes in the cells surrounding an injury in the cuticle of a fly embryo. These wound repair genes then
regenerate the injured patch of cuticle.


In a separate study published in the same issue of Science, a team of researchers led by Stephen Jane at the Royal Melbourne
Hospital in Melbourne, Australia report that, although insect cuticle and the outer layer of mammal skin are very different
chemically, the grainyhead gene is also essential for normal skin development and wound repair in mice.


"The discovery that grainyhead-like factors are required for the response to injury opens up new avenues of research in the
field of wound healing," said Kimberly Mace, the first author of the UCSD paper. "It also opens new avenues for cancer
research, since many cancer cells activate genes normally involved in wound healing in order to kick start processes such as
cell division and cell migration."


Mace, a former graduate student of biology professor William McGinnis, who led the UCSD team, became interested in the
healing of insect cuticle when she noticed lesions in the cuticle of certain fruit fly mutants. She suspected that the
lesions were scar tissue resulting from the failure of the body surface barrier to develop properly. Confirming her
suspicions, the mutant embryos turned out to be much more permeable to a dye than normal embryos.


The group also showed that the genes active in the mutant flies' lesions were activated in normal flies in cells surrounding
a wound created with a sterile needle. The researchers then worked backward, using bioinformatics-computational analysis of
DNA sequences-to identify grainyhead as the master gene that initiates the genetic chain reaction that results in cuticle
repair. Wounds in mutant flies that lack the grainyhead gene fail to heal.


"The genes involved in cuticle repair are activated very quickly, within 30 minutes after injury," said Joseph Pearson, a
graduate student working under McGinnis and a coauthor of the paper. "They are activated over many cell diameters, most
strongly at the boundaries of the wound, suggesting that the grainyhead gene initiates the cuticle repair response after it
receives an as-of-yet unidentified signal produced in cells adjacent to the injury."


In its study, Jane's team found that, like their fruit fly counterparts, mice lacking grainyhead have a much more permeable
skin than normal mice and have deficient wound repair. Both groups point out in their papers that it is interesting that the
regulatory mechanisms for development and repair of the surface barrier in insects and mammals have been conserved, given the
differences in the molecular composition of insect cuticle and mammal skin.


"The proteins that link together to form the insect cuticle and stratum corneum-the outer layer of mammal skin-are completely
different," says McGinnis. "So it is remarkable that flies and mammals share an ancient conserved pathway to construct and
repair the body envelope that protects them from sharp edges and microbes, even though that body envelope is constructed of
mostly different molecules."


In their paper, the UCSD researchers state that studying the wound response pathway in fruit flies, which are easy to
manipulate genetically, may provide new insight into wound healing in mammals. For example, Mace points out that very little
is known how wound tissue stops its growth behavior when the wound is healed. In addition, cancer cells evade this "stop"
program, but how they do it is not well understood.


The study was supported by grants from the National Institutes of Health.


Contact: Sherry Seethaler

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858-534-4656

University of California - San Diego

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