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Arbovirus population biology: temperature impacts on selection and collective dynamics

Award Number: R01AI173206
ORGANIZATION: NATIONAL INSTITUTE OF ALLERGY & INFECTIOUS DISEASES
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 09/01/2023
PERIOD OF PERFORMANCE END DATE: 08/31/2027

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Arbovirus population biology: temperature impacts on selection and collective dynamics - Arthropod-borne viruses (arboviruses) adapt to local conditions, maximizing their potential to perpetuate and emerge as health threats. The adaptive potential of arboviruses is driven by error-prone replication, which creates a genetically diverse pool of competing virus genotypes within each host. One of the most important ways that the environment is changing is that temperatures are rising. This proposal examines some of the ways that temperature may impact arbovirus evolutionary biology. Aim 1 will address how a comprehensive temperature gradient that includes both constant and fluctuating temperatures with varying means and amplitudes alters natural selection on WNV populations within mosquitoes and the strength of bottlenecks. Our predictions are that fluctuating temperatures will increase the strength of purifying selection, that diversity will be maximized at optimal constant temperatures, and that bottlenecks will become wider as temperature increases. Flaviviruses infections are most frequently initiated by aggregates of virus particles. Aim 2 will address the extent that this occurs in a host- and temperature- dependent manner, bringing our previous work into a more ecologically relevant, realistic context. In the second phase of Aim 2, we will ask whether these genome aggregates can help to facilitate the maintenance of genetic diversity in the WNV population. This is important because population bottlenecks can significantly impact virus fitness, and aggregation of genomes in individual infections may help viruses escape from them. We have found that birds that generate high WNV viremia and are highly infectious to mosquitoes (crows) have significantly more unique WNV genomes per cell than those that have lower viremias (robins). Aim 3 will assess whether this also may occur in mosquitoes. We also will assess the degree to which this phenomenon may allow for the maintenance of low fitness viral genotypes while preventing those of high fitness from gaining dominance. Preliminary data supporting the feasibility of these studies is provided in the application. The significance of this work is that it will provide novel, comprehensive data on the ways that changing environmental conditions such as those that we are now experiencing may alter the fundamental population biology of arboviruses. Arboviruses are uniquely susceptible to these conditions because they must replicate in mosquitoes. This is inherently significant. Our work is also significant because it will provide mechanistic data on how viruses may maintain genetic diversity in the face of both selective and stochastic reductions in genetic diversity. Finally, the significance of our work is that we have provided technical and analytical tools that are broadly useful and have permitted us to collaborate effectively with a wide array of investigators. The proposed studies are technically and conceptually innovative because of the ways that we can combine realistic transmission systems in the lab with barcoded viruses, single cell approaches, and other new molecular tools.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2025 ( Subtotal = $647,754 )
2025	2025	COLORADO STATE UNIVERSITY	601 S HOWES ST	FORT COLLINS	CO	80521	LARIMER	USA	Allergy and Infectious Diseases Research	001	3	8/15/2025	EXTENSION WITH OR WITHOUT FUNDS	$647,754
2025	2024	COLORADO STATE UNIVERSITY	601 S HOWES ST	FORT COLLINS	CO	80521	LARIMER	USA	Allergy and Infectious Diseases Research	000	2	8/15/2025	NON-COMPETING CONTINUATION	$0
														Subtotal = $647,754

Issue Date FY: 2024 ( Subtotal = $335,392 )
2024	2024	COLORADO STATE UNIVERSITY	601 S HOWES ST	FORT COLLINS	CO	80521	LARIMER	USA	Allergy and Infectious Diseases Research	000	2	8/7/2024	NON-COMPETING CONTINUATION	$335,392
														Subtotal = $335,392

Issue Date FY: 2023 ( Subtotal = $348,383 )
2023	2023	COLORADO STATE UNIVERSITY	601 S HOWES ST	FORT COLLINS	CO	80521	LARIMER	USA	Allergy and Infectious Diseases Research	000	1	8/29/2023	NEW	$348,383
														Subtotal = $348,383

Grand Total All Awards = $1,331,529

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Arbovirus population biology: temperature impacts on selection and collective dynamics

Award Number: R01AI173206

ORGANIZATION: NATIONAL INSTITUTE OF ALLERGY & INFECTIOUS DISEASES

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

PERIOD OF PERFORMANCE START DATE: 09/01/2023

PERIOD OF PERFORMANCE END DATE: 08/31/2027

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