About Careers MedBlog Contact us
Medindia LOGIN REGISTER
Advertisement

Frog Provides Clues To Congenital Heart Problems

by Gopalan on April 24, 2011 at 9:38 AM
Font : A-A+

 Frog Provides Clues To Congenital Heart Problems

The frogs seem to provide clues to why congenital defects like the DiGeorge syndrome occur.

The syndrome is the most common human disorder caused by a missing chromosome region, occurring at least once in 4,000 live births. It can vary in severity, but may affect many parts of the body, with symptoms including heart defects, immune and endocrine problems, cleft palate, gastrointestinal conditions, growth delay and neuropsychiatric abnormalities.

Advertisement

New research at the University of Pennsylvania offers insight into processes that regulate tissues formation in the heart.

A developmental biologist at Penn's School of Veterinary Medicine, Jean-Pierre Saint-Jeannet, along with a colleague, Young-Hoon Lee of South Korea's Chonbuk National University, has mapped the embryonic region that becomes the part of the heart that separates the outgoing blood in Xenopus, a genus of frog.
Advertisement

Xenopus is a commonly used model organism for developmental studies, and is a particularly interesting for this kind of research because amphibians have a single ventricle and the outflow tract septum is incomplete.

In higher vertebrates, chickens and mice, the cardiac neural crest provides the needed separation for both circulations at the level of the outflow tract, remodeling one vessel into two. In fish, where there is no separation at all between the two circulations, the cardiac neural crest contributes to all regions of the heart.

"In the frog, we were expecting to find something that was in between fish and higher vertebrates, but that's not the case at all," said Saint-Jeannet. "It turns out that cardiac neural crest cells do not contribute to the outflow tract septum, they stop their migration before entering the outflow tract. The blood separation comes from an entirely different part of the embryo, known as the 'second heart field.'"

"As compared to other models the migration of the cardiac neural crest in amphibians has been dramatically changed through evolution," he said.

Saint-Jeannet's research will be published in the May 15 edition of the journal Development.

To determine where the neural crest cells migrated during development, the researchers labeled the embryonic cells with a fluorescent dye, then followed the path those marked cells took under a microscope. "We label the cardiac neural crest cells in one embryo and then graft them onto an embryo that is unlabeled. We let the embryo develop normally and look where those cells end up in the developing heart," said Saint-Jeannet.

Knowing these paths, and the biological signals that govern them, could have implications for human health.

"There are a number of pathologies in humans that have been associated with abnormal deployment of the cardiac neural crest, such as DiGeorge Syndrome," said Saint-Jeannet. "Among other developmental problems, these patients have an incomplete blood separation at the level of the outflow tract, because the cardiac neural crest does not migrate and differentiate at the proper location." 

"Xenopus could be a great model to study the signals that cause those cells to migrate into the outflow tract of the heart,' said Saint-Jeannet. "If you can understand the signals that prevent or promote the colonization of this tissue, you can understand the pathology of something like DiGeorge syndrome and perhaps figure out what kind of molecule we can introduce there to force those cells to migrate further down."



Source: Medindia
Advertisement

Advertisement
News A-Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
What's New on Medindia
World AIDS Day 2022 - Equalize!
Test Your Knowledge on Sugar Intake and Oral Health
Test  Your Knowledge on Heart
View all
Recommended Reading
News Archive
Date
Category
Advertisement
News Category

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.

More News on:
Heart Healthy Heart Statins Mitral Valve Prolapse Aortic Valve Stenosis Pericarditis Ectopic Heartbeat Hypoplastic Left Heart Syndrome Arthrogryposis DOOR Syndrome / Rare Genetic Disorder 

Most Popular on Medindia

Drug Side Effects Calculator Nutam (400mg) (Piracetam) Calculate Ideal Weight for Infants Find a Doctor Vent Forte (Theophylline) Indian Medical Journals Blood - Sugar Chart Selfie Addiction Calculator Iron Intake Calculator Find a Hospital
This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use
×

Frog Provides Clues To Congenital Heart Problems Personalised Printable Document (PDF)

Please complete this form and we'll send you a personalised information that is requested

You may use this for your own reference or forward it to your friends.

Please use the information prudently. If you are not a medical doctor please remember to consult your healthcare provider as this information is not a substitute for professional advice.

Name *

Email Address *

Country *

Areas of Interests