IMAGE:Induced pluripotent stem  cell-derived motor neurons from an ALS patient (left) compared  with normal cells (right). The cells are being used to study the  role of the genes TBK1 and... view  more
    NEW YORK, NY (February 19, 2015)--Using advanced DNA sequencing    methods, researchers have identified a new gene that is    associated with sporadic amyotrophic lateral sclerosis (ALS),    or Lou Gehrig's disease. ALS is a devastating neurodegenerative    disorder that results in the loss of all voluntary movement and    is fatal in the majority of cases. The next-generation genetic    sequencing of the exomes (protein-coding portions) of 2,874 ALS    patients and 6,405 controls represents the largest number of    ALS patients to have been sequenced in a single study to date.  
    Though much is known about the genetic underpinnings of    familial ALS, only a handful of genes have been definitively    linked to sporadic ALS, which accounts for about 90 percent of    all ALS cases. The newly associated gene, called TBK1, plays a    key role at the intersection of two essential cellular    pathways: inflammation (a reaction to injury or infection) and    autophagy (a cellular process involved in the removal of    damaged cellular components). The study, conducted by an    international ALS consortium that includes scientists and    clinicians from Columbia University Medical Center (CUMC),    Biogen Idec, and HudsonAlpha Institute for Biotechnology, was    published today in the online edition of Science.  
    "The identification of TBK1 is exciting for understanding ALS    pathogenesis, especially since the inflammatory and autophagy    pathways have been previously implicated in the disease," said    Lucie Bruijn, PhD, Chief Scientist for The ALS Association.    "The fact that TBK1 accounts for one percent of ALS adds    significantly to our growing understanding of the genetic    underpinnings of the disease. This study, which combines the    efforts of over two dozen laboratories in six countries, also    highlights the global and collaborative nature of ALS research    today.  
    "This study shows us that large-scale genetic studies not only    can work very well in ALS, but that they can help pinpoint key    biological pathways relevant to ALS that then become the focus    of targeted drug development efforts," said study co-leader    David B. Goldstein, PhD, professor of genetics and development    and director of the new Institute for Genomic Medicine at CUMC.    "ALS is an incredibly diverse disease, caused by dozens of    different genetic mutations, which we're only beginning to    discover. The more of these mutations we identify, the better    we can decipher--and influence--the pathways that lead to    disease." The other co-leaders of the study are Richard M.    Myers, PhD, president and scientific director of HudsonAlpha,    and Tim Harris, PhD, DSc, Senior Vice President, Technology and    Translational Sciences, Biogen Idec.  
    "These findings demonstrate the power of exome sequencing in    the search for rare variants that predispose individuals to    disease and in identifying potential points of intervention. We    are following up by looking at the function of this pathway so    that one day this research may benefit the patients living with    ALS," said Dr. Harris. "The speed with which we were able to    identify this pathway and begin our next phase of research    shows the potential of novel, focused collaborations with the    best academic scientists to advance our understanding of the    molecular pathology of disease. This synergy is vital for both    industry and the academic community, especially in the context    of precision medicine and whole-genome sequencing."  
    "Industry and academia often do things together, but this is a    perfect example of a large, complex project that required many    parts, with equal contributions from Biogen Idec. Dr. Tim    Harris, our collaborator there, and his team, as well as David    Goldstein and his team, now at Columbia University, as well as    our teams here at HudsonAlpha, said Dr. Myers. "I love this    research model because it doesn't happen very frequently, and    it really shows how industry, nonprofits, and academic    laboratories can all work together for the betterment of    humankind. The combination of those groups with a large number    of the clinical collaborators who have been seeing patients    with this disease for many years and providing clinical    information, recruiting patients, as well as collecting DNA    samples for us to do this study, were all critical to get this    done."  
    Searching through the enormous database generated in the ALS    study, Dr. Goldstein and his colleagues found several genes    that appear to contribute to ALS, most notably TBK1    (TANK-Binding Kinase 1), which had not been detected in    previous, smaller-scale studies. TBK1 mutations appeared in    about 1 percent of the ALS patients--a large proportion in the    context of a complex disease with multiple genetic components,    according to Dr. Goldstein. The study also found that a gene    called OPTN, previously thought to play a minor role in ALS,    may actually be a major player in the disease.  
    "Remarkably, the TBK1 protein and optineurin, which is encoded    by the OPTN gene, interact physically and functionally. Both    proteins are required for the normal function of inflammatory    and autophagy pathways, and now we have shown that mutations in    either gene are associated with ALS," said Dr. Goldstein. "Thus    there seems to be no question that aberrations in the pathways    that require TBK1 and OPTN are important in some ALS patients."  
    The researchers are currently using patient-derived induced    pluripotent embryonic stem cells (iPS cells) and mouse models    with mutations in TBK1 or OPTN to study ALS disease mechanisms    and to screen for drug candidates. Several compounds that    affect TBK1 signaling have already been developed for use in    cancer, where the gene is thought to play a role in tumor-cell    survival.  
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New ALS gene and signaling pathways identified