Unraveling Batten Disease

Experiments with a yeast gene reveal what goes wrong in a degenerative childhood disease

Waste management is a big issue anywhere, but at the cellular level it can be a matter of life and death. A Weizmann Institute study, published in the Journal of Cell Biology, has revealed what causes a molecular waste container in the cell to overflow in Batten disease, a rare but fatal neurodegenerative disorder that begins in childhood. The findings may form the basis for a therapy for this disorder.

In Batten disease, an insoluble yellow pigment accumulates in the brain’s neurons, causing these cells to degenerate and ultimately die. Patients gradually become disabled, losing their vision and motor skills and suffering mental impairment; they rarely survive beyond their early twenties. It’s been known for a while that the disorder is caused by a mutation in the gene referred to as CLN3, but the role of this gene in the cell was unknown. This role has now been discovered in the Weizmann Institute study, explaining the molecular dysfunction in Batten disease.

The research was conducted in the laboratory of Prof. Jeffrey Gerst of the Molecular Genetics Department by Rachel Kama and postdoctoral fellow Dr. Vydehi Kanneganti, in collaboration with Prof. Christian Ungermann of the University of Osnabrueck in Germany. All the studies were performed in yeast: The yeast equivalent of the mammalian CLN3 gene has been conserved almost intact in the course of evolution, making them ideal models for study. In fact, so similar are the yeast and the mammalian genes that when the researchers replaced a missing copy of the yeast gene with a working copy of mammalian CLN3, normal functioning of the yeast cell was restored.

The experiments showed that the yeast equivalent of CLN3 is involved in moving proteins about the cell – the scientific term is “protein trafficking.” The gene activates an enzyme of the kinase family, which, in turn, launches a series of molecular events regulating the trafficking. When the yeast CLN3 is mutated, this trafficking is disrupted. As a result, certain proteins accumulate abnormally in the lysosome, the cell’s waste-recycling machine, instead of being transported to another destination. At some point the lysosome is filled beyond capacity; it then interferes with molecular signaling and other vital processes in the neuron, eventually killing the cell.

A great deal of research must still be performed before this finding benefits humans, but the clarification of the CLN3 function is precisely what might help develop a new therapy. Replacing the defective CLN3 in all the brain’s neurons is a daunting challenge, but replacing its function – for example, by activating the relevant kinase by means of a drug – should be much more feasible.

Prof. Jeffrey Gerst’s research is supported by the Miles and Kelly Nadal and Family Laboratory for Research in Molecular Genetics; the Hugo and Valerie Ramniceanu Foundation; the Y. Leon Benoziyo Institute for Molecular Medicine; the Yeda-Sela Center for Basic Research; and the estate of Raymond Lapon. Prof. Gerst is the incumbent of the Besen-Brender Professorial Chair of Microbiology and Parasitology.

The Weizmann Institute of Science in Rehovot, Israel, is one of the world's top-ranking multidisciplinary research institutions. Noted for its wide-ranging exploration of the natural and exact sciences, the Institute is home to 2,700 scientists, students, technicians and supporting staff. Institute research efforts include the search for new ways of fighting disease and hunger, examining leading questions in mathematics and computer science, probing the physics of matter and the universe, creating novel materials and developing new strategies for protecting the environment.

Weizmann Institute news releases are posted on the World Wide Web at http://wis-wander.weizmann.ac.il, and are also available at http://www.eurekalert.org.

Alle Nachrichten aus der Kategorie: Life Sciences

Articles and reports from the Life Sciences area deal with applied and basic research into modern biology, chemistry and human medicine.

Valuable information can be found on a range of life sciences fields including bacteriology, biochemistry, bionics, bioinformatics, biophysics, biotechnology, genetics, geobotany, human biology, marine biology, microbiology, molecular biology, cellular biology, zoology, bioinorganic chemistry, microchemistry and environmental chemistry.

Zurück zur Startseite

Kommentare (0)

Schreib Kommentar

Neueste Beiträge

Determination of glycine transporter opens new avenues …

… in development of psychiatric drugs Glycine can stimulate or inhibit neurons in the brain, thereby controlling complex functions. Unraveling the three-dimensional structure of the glycine transporter, researchers have now…

Metallic state of Ag nanoclusters in oxidative dispersion identified in situ

Oxidative dispersion has been widely used in the regeneration of sintered metal catalysts as well as the fabrication of single-atom catalysts. The consensus on the oxidative dispersion process includes the…

A COSMIC approach to nanoscale science

Instrument at Berkeley Lab’s Advanced Light Source achieves world-leading resolution of nanomaterials. COSMIC, a multipurpose X-ray instrument at Lawrence Berkeley National Laboratory’s (Berkeley Lab’s) Advanced Light Source (ALS), has made…

Partners & Sponsors