Jennifer Doudna
About
CRISPR pioneer, Nobel laureate
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Claims by Jennifer Doudna (20 of 25)
Eliminating Mosquitoes Risks Ecological Harm
Although eliminating mosquitoes via gene drive sounds appealing, they are an important food source for animals like bats, so the environmental impact is unclear and unintended ecological consequences could follow beyond what was initially intended.
Genetic Ignorance, Not Technology, Limits Enhancement
The main factor holding back Gattaca-type genetic enhancement is not the editing technology, which is advancing fast, but our own lack of understanding of human genetics—which genes are responsible for which traits—and that knowledge will take time, possibly decades, to acquire.
In-Body Delivery Requires Tissue-Targeted Viruses
Delivering CRISPR into specific tissues in an intact body is hard because viral vectors tend to target only particular cell types; achieving whole-body coverage would require a cocktail of viruses, while the more realistic approach is delivering to specific organs like the liver or brain to treat disease localized to those cells.
Cholesterol Gene Edit as Protective Example
There is a well-documented single gene involved in high cholesterol such that a simple edit could effectively protect a person from cardiovascular disease for their entire life without needing statins, posing the question of whether offering this to parents counts as therapy or enhancement.
Curiosity-Driven Research Begets Technologies
New transformative technologies like CRISPR typically arise from curiosity-driven basic research through a combination of serendipity and occasional flashes of insight; over-focusing science narrowly on goals like curing cancer at the expense of fundamental curiosity-driven inquiry undermines the very process that produces breakthroughs, so a balance is needed.
DNA-RNA-Protein Information Flow
DNA stores genetic information in cells; that information is converted into proteins by reading the DNA code, with RNA serving as an intermediary 'throwaway copy'—though over the last two decades RNA has been recognized as having important functional roles of its own in controlling the flow of genetic information.
Self-Injected CRISPR Stunt Likely Innocuous
A scientist who publicly injected CRISPR into himself was probably doing something innocuous because it likely did not work, but the very idea that someone could inject CRISPR to edit their own body is a wild example of people experimenting irresponsibly.
CRISPR-Cas9 Is a Programmable DNA Scalpel
The CRISPR-Cas9 system is a molecular machine combining a Cas9 protein with a guide RNA whose sequence matches a target DNA sequence; this determines where in the genome the protein binds and cuts, and although discovered in bacteria it can be used as a precise molecular scalpel in eukaryotes including humans.
CRISPR Discovered as Bacterial Antiviral Defense
CRISPR is part of a bacterial immune system: bacteria store pieces of viral DNA in their own chromosome like a genetic vaccination card, copy those sequences into RNA, and those RNA molecules assemble with the Cas9 protein to direct it to matching viral sequences, where Cas9 cuts and destroys the viral DNA.
CRISPR Accuracy Depends on Limiting Cas9 Dosage
CRISPR-Cas9 is remarkably accurate at making precise edits even in very large genomes when used sophisticatedly—keeping Cas9 in limited amounts and not present too long—so that off-target edits, while findable, require hard searching to detect.
Cas9 Searches Genome via Fast Kinetics
Fluorescently labeled Cas9 observed in live cells moves around the nucleus with very fast kinetics—much faster than other nuclear proteins—rapidly sampling along the DNA sequence, and because thousands to tens of thousands of copies search simultaneously, a matching target site is found and cut quickly despite billions of base pairs.
Gene Editing Is a One-and-Done Therapy
Gene editing represents a fundamentally different kind of therapy because, in principle, it is a one-and-done treatment—edits can be detected in targeted cells within a couple of days in animal models, and once made the change need not be repeated.
First Therapeutic Uses: Blood and Eye Diseases
The most plausible first therapeutic uses of CRISPR are blood disorders like sickle cell anemia and thalassemias, and eye diseases—the eye being attractive because it is a relatively isolated tissue treatable by localized viral delivery or direct injection.
Gene Drives Spread Traits Through Populations
A gene drive uses CRISPR's high editing efficiency to rapidly spread a genetic trait through an entire population of rapidly reproducing organisms like insects; it has been demonstrated in the lab and could be used to make mosquitoes unable to spread diseases like Zika or dengue, or unable to breed.
Main Worry Is People Outrunning the Technology
Doudna's primary worry about CRISPR is people getting ahead of the technology itself: because it is widely available and relatively simple for experienced molecular biology labs, many people are experimenting, raising the risk of an unintended or intentional misuse that triggers a public backlash.
Somatic vs Germline Editing Distinction
Somatic cell editing makes changes that are not heritable, whereas germline editing changes eggs, sperm, or embryos—cells capable of creating an entire organism—so that those edits can be passed on to all future generations, meaning germline editing lets us determine how our species evolves.
Global Enforcement Impossible, Need International Norms
It is probably impossible to enforce one country's gene-editing regulations globally, so the best achievable approach is guidelines and norms prepared by international coalitions of people from different countries who agree on procedures that get adopted globally.
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