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Animal model sheds light on rare genetic disorder, signaling pathway
Date:7/20/2011

SALT LAKE CITY A team of researchers from the University of Utah and Brigham Young University has developed a mouse model of focal dermal hypoplasia, a rare human birth defect that causes serious skin abnormalities and other medical problems. This animal model not only provides insight into studying the cause of focal dermal hypoplasia (FDH), but also offers a novel way to study a signaling pathway that is crucial for embryonic development.

The findings were published July 19, 2011, online in the Proceedings of the National Academy of Sciences.

FDH is an uncommon X chromosome-linked genetic disorder characterized by distinctive skin abnormalities and a wide variety of defects affecting the eyes, teeth, fingernails, skeleton, and other body systems. The exact prevalence of FDH is not known, but about 90 percent of cases occur in females. The disorder has been associated with at least 24 different mutations in a gene called PORCN located on the X chromosome. Based on studies in cultured cells and in lower model organisms, PORCN is known to promote secretion of Wnt signaling proteins, key regulators of embryonic development.

"In addition to the integral role it plays in the development of nearly all body tissues, the Wnt signaling pathway has also been implicated in the development of diseases such as cancer and diabetes," says L. Charles Murtaugh, Ph.D., associate professor of human genetics at the University of Utah and lead author on the study. "In our research, we mutated the mouse version of the PORCN gene to better understand its exact functions in the Wnt signaling pathway."

Murtaugh and his colleagues found evidence that PORCN is required for secretion and activity of Wnt proteins, supporting the widely held hypothesis that FDH is a disease of impaired Wnt signaling. They also found PORCN is essential for formation of the mesoderm, the layer of embryonic cells that gives rise to the connective tissues of the body
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Contact: Phil Sahm
phil.sahm@hsc.utah.edu
801-581-2517
University of Utah Health Sciences
Source:Eurekalert

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