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  • Largest genome sequencing study finds surprises: siblings' autism may have different genetic causes
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Largest genome sequencing study finds surprises: siblings' autism may have different genetic causes

TORONTO – A new study led by The Hospital for Sick Children (SickKids) turns scientific prediction on its head. Contrary to what was expected, researchers found that siblings with autism spectrum disorder often carry very different genetic mutations.

This study, published in the Jan. 26 online edition of Nature Medicine, is the largest whole genome sequencing study in autism and one of the largest on any disorder to date. The research highlights the fact that there is significant genetic diversity in autism; it also emphasizes the need to do whole genome sequencing on patients in order to see their complete genetic picture.

“We already knew that there are many differences between autism cases, but our recent findings firmly nail that down. It shows that a full assessment of each individual’s genome is needed to determine how to best use knowledge of their own genetic makeup for autism treatment,” says Dr. Stephen Scherer, Senior Scientist and Director of the Centre for Applied Genomics at SickKids.

Researchers analyzed the DNA of 85 families that each have two children with autism, with a total of 170 individuals with autism. Using the revolutionary technology of whole genome sequencing, they found genetic mutations that were previously missed using techniques like exome sequencing and microarrays, which only look at parts of the DNA. 

“We believe each child with autism is like a snowflake; one is unique from another. Surprisingly, our research found that in more cases than not, even siblings can have two different ‘forms’ of autism,” adds Scherer, who is also Director of the McLaughlin Centre at the University of Toronto. “This research has larger implications for the field of genetics. This means we cannot just look at parts of the DNA if we want to fully understand the underpinnings of autism and other disorders – we need to analyze the entire genome.”

The data collected for this study is an important first step in a much larger international initiative by Autism Speaks in collaboration with Google. The project, called MSSNG, is being led by Scherer and his team at SickKids. The goal is to sequence the genomes of 10,000 families with autism, and store all the data in an open-source research platform – Google Cloud Platform – so it is accessible to researchers around the world. Data from this project is the first to be stored in the MSSNG project cloud, and this is the first time ever that research data is being made broadly available in a cloud-based platform for scientists to share and work from.

“By using the cloud to make data like this openly accessible to researchers around the world, we’re breaking down barriers in a way never done before,” says Robert Ring, Chief Science Officer of Autism Speaks and co-author on the paper. “As always, our goal at Autism Speaks is to accelerate scientific discovery that will ultimately improve the lives of individuals with autism at home and around the world.” "This study not only underscores the importance of whole genome sequencing as a diagnostic tool for autism but also for other common complex diseases. The cloudbased platform for researcher access from all fields is exemplary. We can only hope that the importance of this approach will be recognized by policymakers and health care systems,” says Dr. Bartha Knoppers, Canada Research Chair in Law and Medicine and Director of the Centre of Genomics and Policy, Faculty of Medicine, Department of Human Genetics at McGill University.

The study was supported by Autism Speaks, Autism Speaks Canada, KRG Children's Charitable Foundation, NeuroDevNet, Canadian Institutes for Advanced Research, the University of Toronto McLaughlin Centre, Genome Canada, Ontario Genomics Institute, Ontario Brain Institute, the Government of Ontario, Canadian Institutes of Health Research (CIHR), and SickKids Foundation.

About The Hospital for Sick Children

The Hospital for Sick Children (SickKids) is recognized as one of the world’s foremost paediatric health-care institutions and is Canada’s leading centre dedicated to advancing children’s health through the integration of patient care, research and education. Founded in 1875 and affiliated with the University of Toronto, SickKids is one of Canada’s most research-intensive hospitals and has generated discoveries that have helped children globally. Its mission is to provide the best in complex and specialized family-centred care; pioneer scientific and clinical advancements; share expertise; foster an academic environment that nurtures health-care professionals; and champion an accessible, comprehensive and sustainable child health system. SickKids is proud of its vision for Healthier Children. A Better World. For more information, please visit www.sickkids.ca.

Media contacts:

Matet Nebres
The Hospital for Sick Children
Phone: 416-813-6380
email: matet.nebres@sickkids.ca

Caitlin McNamee-Lamb
The Hospital for Sick Children
Phone: 416-813-7654 ext. 201436
email: caitlin.mcnamee-lamb@sickkids.ca

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