Researchers develop novel mouse model for A-T mutations

Researchers develop novel mouse model for A-T mutations


Fluorescent image of primary brain cells (green) in the cerebellum of a normal, wild type mouse (left) and a severely ataxic A-T mouse (right). Cells in the A-T mouse appear to be shrunken. Credit: The Lundquist Institute

The Lundquist Institute’s investigators have developed a novel mouse model that displays the most comprehensive set of A-T symptoms which provides for the very first time a resource to not only clarify the mechanisms of this neurological dysfunction but also gives researchers a critically needed in vivo model to test future A-T therapeutics. The investigators also demonstrated that Small Molecule Read-Through (SMRT) compounds can restore ATM production. The disease results from a mutation in the A-T mutated gene (ATM). This gene provides instructions for making a protein that helps control the rate at which cells grow and divide. Defects in this gene can lead to abnormal cell death around the body, including the part of the brain that helps coordinate movement. The complete study is published in the journal eLife.

Ataxia Telagiectasa (A-T) is a rare childhood disease. Ataxia refers to uncoordinated movements, such as walking. The telagiectasias are enlarged blood vessels found just below the skin. It is an inherited disease passed down from parents to children and is an autosomal recessive genetic trait. An autosomal recessive disorder means two copies of an abnormal gene must be present in order for the or trait to develop, that is, both parents must provide a copy of a nonworking gene for the child to have symptoms of the disorder. Boys and girls are equally affected.

“This noteworthy breakthrough is a big step forward in developing effective therapeutics for A-T,” said Paul Mathews, Ph.D., Lundquist Investigator, Co-Director of the Neurotherapeutics IWI and Assistant Professor at the David Geffen School of Medicine at UCLA and Lead Investigator on the A-T study. “My colleagues and I are excited to have developed the novel mouse to test how ATM deficiency causes cerebellar pathology and ataxia and to have also demonstrated that ATM production can be restored. Until now we have been working under severe limitations by not having a suitable preclinical model for therapeutic testing especially for a rare disorder like A-T. This makes all the difference for testing previously proposed therapeutic candidates for the disorder.”


New recessive neurodevelopmental disorder identified


More information:
Harvey Perez et al, A novel, ataxic mouse model of Ataxia Telangiectasia caused by a clinically relevant nonsense mutation, eLife (2021). DOI: 10.7554/eLife.64695

Journal information:
eLife

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The Lundquist Institute

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Researchers develop novel mouse model for A-T mutations (2021, November 11)
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