Biological Basis for how Environmental Exposures Impact Risk for Psychiatric Disorders (R21 Clinical Trial Not Allowed) | RFA ES 22 009

Opportunity Information: Apply for RFA ES 22 009

This NIH funding opportunity (RFA-ES-22-009) supports exploratory research that digs into the biological mechanisms linking environmental exposures to increased risk for psychiatric disorders that typically emerge in late childhood, adolescence, or early adulthood. The central goal is to move beyond broad associations and clarify how specific exposures can change brain biology and behavior in ways that contribute to the development of mental illness. The program is especially interested in work that can explain mechanism: what changes at the molecular, cellular, circuit, or systems level occur after an exposure, when those changes happen during development, and how they plausibly connect to psychiatric-relevant outcomes.

The award uses the NIH R21 mechanism, which is designed for early-stage, high-risk, high-reward projects or projects using novel tools and ideas that could open up a new research direction. In practice, that means applicants do not need to present a fully mature, long-term research program; instead, the emphasis is on feasibility, innovation, and the potential for strong impact if the approach works. Because the FOA is positioned as mechanistic and foundational, it is explicitly "Clinical Trial Not Allowed," signaling that the work should not be structured as an interventional clinical study in humans. The intent is to enable rapid, hypothesis-driven exploration that can later inform larger studies, including potential prevention or therapeutic strategies.

A major scientific priority is basic and pre-clinical research that clarifies neurobiological pathways connecting environmental chemicals or other relevant exposures to psychiatric-like phenotypes. The FOA encourages a wide range of experimental systems, from in vitro models (for example, cell culture systems that allow precise exposure control and molecular readouts) to whole-organism models that can capture complex brain-behavior relationships. Proposed studies can focus on how exposures influence neurodevelopment, synaptic function, neuroimmune signaling, endocrine pathways, epigenetic regulation, neurotransmitter systems, or other biological processes relevant to behavior and psychiatric vulnerability. The emphasis is on credible biological causal pathways rather than purely descriptive findings.

Another highlighted area is psychiatric conditions where the environmental link is less established. In other words, the program is not only looking for "well-known" exposure-disorder pairings; it also welcomes applications that push into under-studied disorders or less obvious exposure pathways, as long as the proposed mechanism is compelling and the approach is rigorous. In addition, the FOA welcomes studies examining gene-by-environment contributions to risk, recognizing that environmental factors often interact with genetic susceptibility rather than acting in isolation. Projects that integrate genetic models, genomic tools, or approaches that can test interaction effects are within scope when they help explain how exposure-related risk is biologically mediated.

The expected payoff from this portfolio is actionable knowledge about mechanisms that could eventually guide better intervention, prevention, or treatment strategies. Mechanistic clarity can help identify biomarkers of exposure effects, sensitive developmental windows, modifiable pathways, and potential targets for therapeutic development or risk reduction. This R21 FOA runs in parallel with a related R01 opportunity (RFA-ES-22-008), with the R21 serving as the exploratory on-ramp for ideas that may later scale to a more extensive R01 project.

Administratively, the opportunity is offered by the National Institutes of Health under an environmental health focus (CFDA 93.113) and is categorized as a discretionary grant. The posted award ceiling is $275,000. The original closing date listed is 2023-02-22. Eligibility is broad and includes many U.S.-based public and private entities: state, county, and local governments; special districts; independent school districts; public and state-controlled universities; private institutions of higher education; federally recognized tribal governments and other tribal organizations; public housing authorities/Indian housing authorities; nonprofits with or without 501(c)(3) status (outside of higher education); for-profit organizations (other than small businesses); and small businesses. The FOA also explicitly calls out additional eligible applicant types such as HBCUs, Hispanic-serving institutions, Tribally Controlled Colleges and Universities, Alaska Native and Native Hawaiian-serving institutions, AANAPISIs, faith-based or community-based organizations, regional organizations, U.S. territories or possessions, and certain tribal governments not federally recognized.

Foreign institutions are not eligible to apply, and non-U.S. components of U.S. organizations are not eligible to apply. However, foreign components, as NIH defines them in its Grants Policy Statement, are allowed, meaning a U.S. applicant organization can include certain well-justified international elements as part of the project while remaining a U.S.-led application.

• The National Institutes of Health in the environment, health sector is offering a public funding opportunity titled "Biological Basis for how Environmental Exposures Impact Risk for Psychiatric Disorders (R21 Clinical Trial Not Allowed)" and is now available to receive applicants.
• Interested and eligible applicants and submit their applications by referencing the CFDA number(s): 93.113.
• This funding opportunity was created on 2022-10-03.
• Applicants must submit their applications by 2023-02-22. (Agency may still review applications by suitable applicants for the remaining/unused allocated funding in 2026.)
• Each selected applicant is eligible to receive up to $275,000.00 in funding.
• Eligible applicants include: State governments, County governments, City or township governments, Special district governments, Independent school districts, Public and State controlled institutions of higher education, Native American tribal governments (Federally recognized), Public housing authorities/Indian housing authorities, Native American tribal organizations (other than Federally recognized tribal governments), Nonprofits having a 501 (c) (3) status with the IRS, other than institutions of higher education, Nonprofits that do not have a 501 (c) (3) status with the IRS, other than institutions of higher education, Private institutions of higher education, For-profit organizations other than small businesses, Small businesses, Others.

Apply for RFA ES 22 009

[Watch] Creating a grant proposal using the step-by-step wizard inside the applicant portal: