The BCM department of neurology team replicated the defect in mice, developing a mouse model of the disease that could help researchers figure out effective treatments for and new approaches to curing the disease, said Dr. Jeffrey Noebels (http://www.bcm.edu/neurology/faculty/noebels.html), professor of neurology, neuroscience and molecular and human genetics at BCM and director of the Blue Bird Circle Developmental Neurogenetics Laboratory at BCM, where the research was performed.
"While many genes underlying various forms of childhood epilepsy have been identified in the past decade, most cause a disorder of 'pure' seizures," said Noebels. Why some children have a more complicated set of disorders beginning with major motor spasms in infancy followed by cognitive dysfunction and developmental disorders such as autism remained a mystery until the discovery by the BCM team that a mutation in only a single gene explains all four features of catastrophic epilepsy.
A gene known as Aristaless-related homeobox or ARX has a specific mutation called a triplet repeat, which means that a particular genetic (in this case, GCG) is repeated many times in the gene. When the researchers duplicated this particular mutation in specially bred mice, the animals had motor spasm similar to those seen in human infants. Recordings of their brain waves showed that they had several kinds of seizes, included absence epilepsy and general convulsion. They also had learning disabilities and were four times more likely to avoid contact with other mice than their normal counterparts. This behavior is similar to that seen in children with autism or similar disorders in the same spectrum.
"The new model is an essential tool to find a cure for the disorder," said Noebels.
"Mutation of the ARX gene was previously known to affect interneurons, a class of cells that inhibit electrical activity in the brain," said Dr. Maureen Price (http://www.bcm.edu/neurology/faculty/price.html), the report's lead author and an instructor in neurology at BCM.
When researchers evaluated the brains of the adult mice with the mutated gene, they found that a special class of interneurons had never developed in specific brain regions.
"Further study will allow use to pinpoint which brain region is liked to the autistic-like behavior," said Price.
Two members of the research team – Dr. James Frost, professor of neurology at BCM (http://www.bcm.edu/neurology/faculty/frost.html), who developed the concept of the special mouse, and Dr. Richard Hrachovy (http://www.bcm.edu/neurology/faculty/hrachovy.cfm), also a professor of neurology at BCM – are pioneers in the study of human infantile spasms.
"At present there is no proven cure to offer children with this specific epilepsy", said Noebels. "We now have new clues into the mechanism and have already initiated studies with a new class of drugs not previously explored for this disorder." The new drug testing is supported by the private foundation People Against Childhood Epilepsy.
Others who took part in this work include Jong W. Yoo, Daniel L. Burgess and Fang Deng, all of BCM.
Funding for this work came from the Peter Kellaway Memorial Research Fund, the Blue Bird Circle Foundation, the National Institutes of Health Intellectual and Developmental Disabilities Research Center, and the PACE Foundation.
When the embargo lifts, this report will be available at http://www.jneurosci.org/
For more information on basic science research at Baylor College of Medicine, please go to www.bcm.edu/fromthelab or www.bcm.edu/news.
Graciela Gutierrez | EurekAlert!
Climate Impact Research in Hannover: Small Plants against Large Waves
17.08.2018 | Leibniz Universität Hannover
First transcription atlas of all wheat genes expands prospects for research and cultivation
17.08.2018 | Leibniz-Institut für Pflanzengenetik und Kulturpflanzenforschung
New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.
Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...
17.08.2018 | Event News
08.08.2018 | Event News
27.07.2018 | Event News
17.08.2018 | Physics and Astronomy
17.08.2018 | Information Technology
17.08.2018 | Life Sciences