How CRISPR lets us edit our DNA | Jennifer Doudna

Geneticist Jennifer Doudna co-invented a groundbreaking new technology for editing genes, called CRISPR-Cas9. The tool allows scientists to make precise edits to DNA strands, which could lead to treatments for genetic diseases … but could also be used to create so-called “designer babies.” Doudna reviews how CRISPR-Cas9 works — and asks the scientific community to pause and discuss the ethics of this new tool.

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Genetically Modified Humans? CRISPR/Cas 9 Explained – YouTube

Fans of Blade Runner have already caught a glimpse of world with super-powered humans secretly living among us, capable of physical feats far beyond your everyday person. But now, with the the CRISPR/CAS9 Gene editing system, are we looking at a future with real replicants? Check out this video to get an inside look at how CRISPR works, and the sorts of wild medical advances that are on the horizon.

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How to Make a Lac Operon Using Dollar Store Items

Lac Operon

Written by Bassam El Masriitten, a 2015 Galbraith winner from the University of Ontario Institute of Technology

After teaching DNA replication and protein synthesis (transcription and translation), students are expected to be familiar with the mechanisms that control gene expression. A commonly studied example, in prokaryotes, is the Lac Operon (inducible model) and/or the Trp Operon (repressible model).

The procedure that follows outlines the steps for a teacher to build a Lac Operon model in order to demonstrate to the whole class how an operon functions. Students should be given time in class to look closely at the model themselves and manipulate it in order to better grasp the concept and be able to complete the assignment which follows.

Click here to download the complete lesson.

20 Years After Dolly

It’s been 20 years since scientists in Scotland told the world about Dolly the sheep, the first mammal successfully cloned from an adult body cell. What was special about Dolly is that her “parents” were actually a single cell originating from mammary tissue of an adult ewe. Dolly was an exact genetic copy of that sheep – a clone.

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Epigenetics: Ending the Nature versus Nurture Debate

dnaIs it nature or nurture? That was the theme of a Café Scientifique in Toronto, hosted by the Canadian Institutes of Health Research (CIHR). Three experts talked about the field of epigenetics and how the ‘nature or nurture’ debate is a futile argument.

Recent spectacular advances in genetic research may make you think scientists are on the brink of solving the whole puzzle about what makes us human. Today, supercomputers can sequence billions of DNA molecules at once. The cost to sequence an entire genome now stands at about $2,000-4,000, significantly lower than the cost of several hundred million dollars in 2001 when the Human Genome Project was just beginning.

Researchers recently sequenced an entire family’s genome and learned that the son does not carry a gene that increases risk for developing dangerous blood clots in the future yet the daughter does. By running the daughter’s genetic information through a drug database, her optimal treatment for the future, should she need one, is already identified.

In the near future, we could all have our genomes sequenced and that information could become a standard part of our personal health records. But will having our DNA on our smartphone tell us what our destiny is?

Not by a long shot.

Our genome contains the entire record of our selves. But it is the epigenome that tells the genes whether to switch on or off, by adding or removing chemical tags.

“This is really very novel, to think that our DNA is sitting around in our early life, waiting to get experience, and because of that experience, more protein or less protein is being made. We now understand the biological mechanism for how that happens,” said Marla B. Sokolowski, PhD, FRSC, Canada Research Chair in Genetics and Behavioural Neurology and Professor and Academic Director at the University of Toronto.

“Think of DNA as books in a library. That library is not particularly useful until you read those books. So the DNA is sitting there in the cells but when there is an experience that that individual has, then that DNA can be read. It can be opened up and then the gene can be expressed. In the case of epigenetics, there are proteins that interact with the DNA that determine if it can be read or not. So if a child grows up in a very stressful environment, the genes that are important for coping with stress get wrapped up in those proteins and so they cannot be expressed. And that’s what is meant by epigenetics,” said Dr. Sokolowski.

Dr. Sokolowski discussed the groundbreaking rat studies by Michael Meaney, Moshe Syzf and Gustavo Turecki, Ph.D ’99 at McGill, showing that when a mother rat licks her babies, a gene that decreases the amount of stress hormones that get released gets turned on.

Dr. Sokolowski spoke about her current CIHR funded study about mother-infant interactions, which seeks to find how those interactions vary depending on whether the mother had a history of abuse. Everyone has one of two forms of a gene that controls how much serotonin, the major chemical responsible for regulating mood and emotion, is transported from one place to another in the brain. But that gene may not always be expressed, if epigenetic tags have been added from abusive experiences.

Dr. Rosanna Weksberg spoke about how environmental factors can impact on how genes are expressed as early as when new life is first implanted. She cited the case where Danish mothers who were 0-10 weeks pregnant during a famine delivered very low birth weight babies that even 60 years later carried different growth factor marks on their genes compared to those who were not affected by the famine. Dr. Weksberg is Staff Physician with Clinical and Metabolic Genetics at The Hospital for Sick Children and Professor, Pediatrics and Molecular Genetics at the University of Toronto.

Dr. Albert Wong talked about his research which hopes to find potential drug treatments that could help prevent the expression of strong inherited susceptibilities for schizophrenia and depression, by acting on the epigenome. Dr. Wong is Research Scientist, Neuroscience Division at the Center for Addiction and Mental Health (CAMH) and Associate Professor, Psychiatry and Pharmacology at the University of Toronto.

So, is it nature or nurture? The answer is ‘both,’ right down to our genes.

JLangille

Jane Langille is a Toronto-area freelance writer who writes about health, wellness, and active living. She writes custom content for healthcare brands as well as articles for print and online publications. Her website is: http://janelangille.com/. Jane is also a professional member of the Association of Health Care Journalists, a member of Professional Writers Association of Canada, and a member of the International Association of Business Communicators, Toronto. Used with permission.