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Printable Handouts
Navigable Slide Index
- Introduction
- Air traffic
- Global cargo ship movements
- Invasive alien species are ubiquitous
- Invasive species
- Genetic population management
- Population modification
- Population suppression
- Population modification followed by suppression
- Reproductive isolation
- Modify the wild population so that its members no longer cause harm (disease)
- Problem: traits of interest usually result in some fitness cost to carriers
- Solution
- Gene drive element
- Medea and ClvR
- Medea: a novel selfish genetic element (1)
- Medea: a novel selfish genetic element (2)
- Medea gains a transmission advantage
- Medea spreads, eliminating non-Medea individuals
- Medea elimination depends on fitness cost and introduction ratio
- Medea: how can we build it?
- Maternal essential gene
- The toxin: loss of maternally-expressed gene
- The antidote: expression of this gene in the embryo
- The result?
- Medeamyd88 spreads through (modifies) a Drosophila population
- Medea elements can be generated via multiple genes
- The limitation of genetic knowledge
- A new mechanism of gene drive
- Site-specific DNA sequence modifications
- Cas9 mechanism
- Potential use of Cas9 and gRNAs
- Recoded versions of an essential gene are functional and ressitant to cleavage
- Cleave and Rescue (ClvR) gene drive (1)
- Mendelian inheritance
- ClvR mechanism of action (1)
- ClvR mechanism of action (2)
- ClvR elemination depends on fitness cost and introduction ratio
- Cleave and Rescue (ClvR) gene drive (2)
- ClvR constructs
- Mitochondrial protein translation: X chr.
- Transcription: 3rd chr.
- Cytoplasmic ribosome assembly: 2nd chr.
- Key characteristics of ClvR elements
- Thank you for listening
Topics Covered
- Genetic population management
- Gene drive
- Medea structure
- Medea mechanism of action
- Maternal essential gene
- Toxin-antidote-based signaling
- Cleave and Rescue (ClvR) gene drive
- Key characteristics of ClvR elements
- ClvR mechanism of action
Links
Series:
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Talk Citation
Hay, B.A. (2023, May 31). Engineering the composition and fate of wild populations with Medea and ClvR: key characteristics of Medea and ClvR [Video file]. In The Biomedical & Life Sciences Collection, Henry Stewart Talks. Retrieved December 22, 2024, from https://doi.org/10.69645/QVKJ7887.Export Citation (RIS)
Publication History
Financial Disclosures
- Prof. Bruce A. Hay has not informed HSTalks of any commercial/financial relationship that it is appropriate to disclose.
Engineering the composition and fate of wild populations with Medea and ClvR: key characteristics of Medea and ClvR
Published on May 31, 2023
38 min
Other Talks in the Series: Gene-Drives and Active Genetics
Transcript
Please wait while the transcript is being prepared...
0:00
Welcome to HSTalks.
My name is Bruce Hay.
What I want to do today
is to introduce you
to two gene drive mechanisms.
Medea, the first gene drive
mechanism synthesized,
and the second one that we
generated more
recently called ClvR.
0:22
If we go to the first slide,
what you see here is
the pattern of air traffic
throughout the world.
This really is
meant to emphasize
the extent of globalization,
that we have plants,
animals, people,
their pathogens and symbionts
moving all over the world.
0:40
On the next slide, you
see the same phenomenon
now shown with shipping traffic.
Again, plants, animals,
their pathogens and
symbionts go everywhere.
0:53
On the next slide,
you see that a
consequence of that is
that invasive species
end up being moved
all over the world.
Invasive species is
essentially a plant, animal,
or some other organism
including microorganisms
that ends up in an
inappropriate environment
and ends up thriving
in that environment,
often times in a
way that results
in damage to the
existing environment,
and/or crops, animals,
plants or people.
1:25
What we end up with as
a result of all of this
is that we have
pests, pathogens,
invasive species, disease
vectors and weeds
ending up in inappropriate
places throughout the world.
All of this then results
in plant, animal, human
disease and crop loss,
ecosystem degradation,
and loss of beneficial and
other endangered species.
What this leads to then is
it creates a kind of sand
in the gears of the well-functioning
workings of the world.
It just gums things up,
creates a lot of waste, damage,
and in some cases
loss of species.
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