Genetic Engineering Strategy for Lyme Disease
- Scientists are utilizing genetic engineering technology on Nantucket to address the transmission of Lyme disease, a tick-borne illness prevalent in the United States 0s.
- The project focuses on wild white-footed mice rather than deer or ticks, as these mice serve as the primary carriers of the bacteria that cause Lyme disease 0s.
- Approximately 15% of Nantucket residents have been afflicted by Lyme disease, leading some to characterize the illness as a local plague that justifies the potential engineering of a wild organism 42s.
- MIT associate professor Kevin Esvelt and Tufts University epidemiologist Sam Telford are collaborating on this research, with Telford having studied ticks on the island for four decades 1m15s.
Transmission Cycle of Lyme Disease
- Ticks can transmit Lyme disease to humans if they remain attached for more than 24 hours, at which point they become engorged with blood 1m45s.
- The infection cycle involves ticks picking up bacteria from infected white-footed mice and subsequently passing the bacteria to uninfected mice 2m35s.
- While deer do not contract Lyme disease, they facilitate the spread of the disease by serving as hosts for ticks, which can lay up to 2,000 eggs after feeding on them 2m35s.
- The proposed strategy involves genetically altering the white-footed mice to make them immune to Lyme disease, thereby preventing ticks from becoming infected when they bite the mice 2m35s.
- This approach aims to interrupt the cycle of infection without the need to kill the mouse population 2m55s.
Ecological and Medical Impact of Lyme Disease
- There is concern regarding how altering the mouse population might impact the broader food chain that relies on these animals 0s.
- The goal of using new technologies is to allow wild creatures to maintain their ecological roles without transmitting diseases that cause human suffering 4s.
- Dr. Timothy Lepore, an 80-year-old physician on Nantucket, has served as the island's emergency room head, surgeon, and medical examiner over the past 40 years 18s.
- Dr. Lepore currently operates the only private practice on Nantucket, where he treats dozens of patients for Lyme disease annually 25s.
- While Lyme disease is treatable with antibiotics, untreated infections can spread to the heart, joints, and nervous system 48s.
- Shauna Asplint, a 33-year-old patient, was diagnosed with Lyme disease at age 10 and continues to experience physical pain and residual facial paralysis 54s.
- Lyme disease symptoms observed in patients include facial palsies, swollen knees, and rashes, which can significantly alter daily activities and behavior 1m15s.
Environmental Origins of the Tick Problem
- The tick problem on Nantucket originated in 1926 when two female deer were imported to the island, leading to a population boom 1m23s.
- Environmental changes, including the designation of half the island as conservation land in the 1950s, created brush and grasslands that serve as ideal habitats for ticks and mice 1m31s.
- The current prevalence of tick-borne disease is attributed to human engineering of the environment, which maximized the populations of ticks and the mice that host them 1m41s.
CRISPR Technology and Genetic Modification
- Kevin Esvelt, who leads the Sculpting Evolution Lab at MIT, proposed in 2013 that CRISPR technology could be used to permanently alter the genetics of a species 1m50s.
- The "Mice Against Ticks" project involves research into adding a gene for an antibody that prevents Lyme infection into mouse embryos 2m6s.
- Researchers Joanna Buchthal and Zach Hill utilize a technique that involves injecting both cells of a two-cell embryo to increase the probability of successfully integrating the antibody gene into the DNA 2m13s.
- The injection process involves using CRISPR as molecular scissors to cut the targeted DNA, allowing the cell to insert the antibody gene into the mouse's genetic code 2m45s.
- Scientists have developed laboratory mice that are hereditarily immune to Lyme disease, meaning the immunity is encoded into their genes and passed on to their offspring 0s.
- This approach effectively accelerates the process of evolution, a method that requires caution because it involves changes that would not occur naturally 25s.
Community Engagement and Regulatory Oversight
- The proposed plan involves releasing thousands of these engineered mice on Nantucket, beginning during the winter months when the native mouse population is at its lowest 36s.
- Nantucket was selected for this project due to its high incidence of Lyme disease and its tradition of town hall democracy, which allows for community engagement 42s.
- Researchers have held multiple meetings with Nantucket residents to present findings, address concerns, and gather community input regarding the potential release of the mice 56s.
- Local residents have expressed a range of reactions, including enthusiasm for the potential to reduce Lyme disease, concerns about the mice's role in the food chain, and questions regarding the timeline for effectiveness 1m12s.
- Dr. Timothy Lepore, while supportive of the proposal, has emphasized the need for testing to ensure that altering the field mouse population does not result in unintended ecological consequences for predators like hawks 1m36s.
- Because this technology affects the environment for everyone and makes it difficult for individuals to opt out, researchers advocate for a transparent development process that gives the public a voice early on 2m6s.
- Before any potential release on Nantucket, the team intends to conduct a small field trial on a private island, pending approval from federal and state regulators, to study ecological impacts 2m25s.
- The ultimate goal is to achieve a successful field trial that significantly reduces the number of infected ticks without causing harm to the ecosystem, followed by a final community decision on whether to proceed 2m35s.
