Researchers find possible genetic clues to organ development, birth defects (w/ Video)

by Leslie Ridgeway

(Medical Xpress)—Using cutting-edge time-lapse photography, University of Southern California (USC) researchers have discovered clues to the development of the head at the cellular level, which could point scientists to a better understanding of how organs and birth defects form in humans.

A team of researchers at the Eli and Edythe Broad Center for Regenerative Medicine and at USC has for the first time determined the role of two important molecular signaling pathways that help control the number and position of repeated units of cells that pattern the head and face.

Two members of a "Wnt" are instrumental in forming pharyngeal pouches that organize the structure of the head and face. Problems with forming the pouches can result in , including the rare DiGeorge syndrome, which causes an array of symptoms including an abnormal facial appearance, , , and loss of the thyroid and thymus.

The research, "Wnt-Dependent Epithelial Transitions Drive Pharyngeal Pouch Formation," was published Feb. 11, 2013 in Developmental Cell. Principal author is Chong Pyo Choe, research associate at the Keck School of Medicine of USC.

This video is not supported by your browser at this time.
Using cutting-edge time-lapse photography, University of Southern California researchers have discovered clues to the development of the head at the cellular level, which could point scientists to a better understanding of how organs and birth defects form in humans. Credit: University of Southern California

The research, conducted over a five-year period, was accomplished by photographing live zebrafish embryos every 10 minutes for 36-hour periods with a sophisticated microscope, enabling the researchers to see the pouches forming in real time, said Gage Crump, assistant professor in cell and neurobiology, and corresponding author on the research.

"Zebrafish and humans are similar at the and the organ level," Crump said. "They have almost all the same organs that we do, which makes the fish a very relevant system for understanding human health and disease."

The pharyngeal pouches develop the gills in fish, and in human fetuses they also form gill-like structures, which later organize the head skeleton and organs such as the thymus and thyroid. Birth defects like DiGeorge syndrome can be traced back to malformations in the development of the pharyngeal pouches, Crump said.

Choe developed more than 100 different transgenic lines, transferring key genes to live zebrafish embryos where they could be studied under the microscope at the single cell level. Surprisingly, the lengthy filming doesn't harm the embryos and they can grow up to be normal fish, Crump said.

The Wnt pathways are significant because they control two separate cell behaviors. Choe discovered this by finding a way to genetically block each pathway and then making time-lapse videos of how development went wrong in each case.

"In the future as we get better at harnessing stem cells to create organs, we hope to be able to bioengineer these cells to make a particularly shaped organ," Crump said. "What we're learning in zebrafish by studying these pouches will be generally applicable and we can pursue these basic principles to come up with new types of technology involving cellular therapy."

The team is now studying other signaling pathways and their possible contributions to organ development and defects.

Related Stories

Cleft lip corrected genetically in mouse model

Nov 28, 2011

Scientists at Weill Cornell Medical College used genetic methods to successfully repair cleft lips in mice embryos specially engineered for the study of cleft lip and cleft palate. The research breakthrough may show the way ...

Study tracks down cause of birth defect

Feb 13, 2012

A USC research team has pinpointed the source of a genetic disorder that causes life-threatening birth defects, which may allow doctors to quickly diagnose and better treat the disease.

Recommended for you

Neutralising antibodies for safer organ transplants

5 hours ago

Serious complications can arise following kidney transplants. If dialysis is required within the first seven days, then the transplanted organ is said to have a Delayed Graft Function (DGF), and essentially ...

User comments