Environmental Risks for Psychiatric Disorders: Biological Basis of Pathophysiology (R21 Clinical Trial Not Allowed) | PAR 19 385

Opportunity Information: Apply for PAR 19 385

This NIH funding opportunity, Environmental Risks for Psychiatric Disorders: Biological Basis of Pathophysiology (R21 Clinical Trial Not Allowed) (PAR-19-385), supports exploratory research aimed at figuring out how environmental exposures can change brain biology and behavior in ways that raise the risk for psychiatric disorders that commonly begin in late childhood, adolescence, or early adulthood. The emphasis is on biological mechanisms: applicants are expected to move beyond simply showing that an exposure is associated with symptoms and instead investigate how an exposure "gets under the skin" to influence neurodevelopment, neural circuits, physiology, and behavior in ways that contribute to psychiatric risk. The FOA highlights a practical long-term goal as well: building mechanistic knowledge that can ultimately inform better prevention strategies, earlier interventions, and improved therapeutics.

The announcement uses the NIH R21 mechanism, which is designed for exploratory and developmental projects. That means the program is intentionally open to higher-risk ideas, new methods, and early-stage lines of investigation that may not yet have the extensive preliminary data expected for larger awards. The ceiling listed in the source information is $200,000, reflecting the typical smaller scale of R21 projects and the expectation that they will generate proof-of-concept findings, novel datasets, or mechanistic insights that can later be expanded through mechanisms like an R01. The FOA is also described as running in parallel with a companion opportunity under an R01 mechanism (PAR-20-NNN), signaling that applicants should match their project scope to the appropriate grant type: R21 for smaller, innovative, or early work, and R01 for more mature, fully powered programs of research.

A central theme of the FOA is environmental risk, broadly construed, and the need to explain the biological basis of the resulting vulnerability to psychiatric conditions. While the text does not restrict applicants to any single exposure type, the intent is to support research that interrogates environmental factors in ways that can be tied to measurable biological pathways (for example, changes in neural circuitry, immune signaling, endocrine function, synaptic plasticity, gene regulation, or other neurobiological processes). The FOA explicitly notes that it is especially interested in psychiatric conditions where the environmental link is less established, encouraging proposals that push into areas with thinner evidence bases rather than repeatedly targeting only the most well-known exposure-disorder relationships.

In terms of study approaches, the FOA welcomes a wide methodological range. Projects may use mechanistic experiments in whole-organism models, or in vitro and in vivo systems, as well as human studies. For human work, the announcement allows studies that either add new data collection activities or leverage existing datasets and biospecimens, which is important for applicants who can capitalize on established cohorts, archived biological samples, or existing exposure data and link those resources to new mechanistic measures. Across these approaches, the unifying expectation is that the research will clarify causal or biologically plausible pathways connecting exposure to altered brain or behavioral functioning, rather than focusing purely on descriptive epidemiology.

The FOA also highlights interest in the joint contribution of genes and environment, making gene-by-environment and related integrative designs a good fit. In practice, this could include studies that examine how genetic variation modifies sensitivity to a given exposure, how environmental factors influence gene expression or epigenetic regulation in relevant tissues, or how combined genetic liability and exposure history shape intermediate phenotypes that sit between exposure and diagnosis. The announcement gives applicants flexibility in how they define outcomes: studies can focus on categorically defined psychiatric diagnoses and/or continuous traits distributed in the general population, which supports dimensional approaches and aligns with the reality that many psychiatric risk factors and symptoms exist on spectra.

Another notable program preference is attention to comorbidity and shared etiology. Applicants are encouraged to consider co-occurring psychiatric conditions and the possibility that different disorders share environmental and biological pathways. This reflects the common overlap among anxiety, depression, substance use, psychosis-spectrum experiences, and other conditions during the developmental window emphasized by the FOA. Proposals that explicitly model shared mechanisms, transdiagnostic traits, or common neurobiological consequences of exposure may therefore align well with the announcement's goals.

Administrative details in the source data indicate that the sponsor is the National Institutes of Health, the funding instrument is a grant, and the activity category is listed as Environment, Health under CFDA 93.113. The original closing date shown is 2021-11-16, and the FOA is labeled "Clinical Trial Not Allowed," meaning applicants should not propose work that meets NIH's definition of a clinical trial (for example, prospective assignment to an intervention to evaluate health-related outcomes). Observational human studies, mechanistic studies, and other non-trial designs can still be appropriate as long as they do not cross into clinical trial territory.

Eligibility is broad and includes many U.S.-based organizational types such as state, county, and local governments; public and private institutions of higher education; independent school districts; special district governments; federally recognized Native American tribal governments and other tribal organizations; public housing authorities/Indian housing authorities; nonprofits with or without 501(c)(3) status; for-profit organizations (other than small businesses); and small businesses. The FOA also explicitly calls out additional eligible applicant categories, including Historically Black Colleges and Universities (HBCUs), Hispanic-serving Institutions, Tribally Controlled Colleges and Universities (TCCUs), Alaska Native and Native Hawaiian Serving Institutions, and Asian American Native American Pacific Islander Serving Institutions (AANAPISI), as well as faith-based or community-based organizations and eligible federal agencies. Foreign institutions (non-U.S. entities) are not eligible to apply, and non-U.S. components of U.S. organizations are not eligible; however, foreign components as defined in the NIH Grants Policy Statement are allowed, which can enable discrete international collaborations when justified and compliant with NIH policy.

Overall, this FOA is aimed at sparking creative, mechanism-focused research on how environmental exposures contribute to psychiatric risk during key developmental periods, with special interest in understudied exposure-disorder connections, integrative gene-environment frameworks, and designs that can illuminate shared pathways across comorbid conditions. The expected output is not a completed intervention trial, but rather actionable biological insight that can later guide prevention, early identification, and treatment development.

• The National Institutes of Health in the environment, health sector is offering a public funding opportunity titled "Environmental Risks for Psychiatric Disorders: Biological Basis of Pathophysiology (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 2019-09-30.
• Applicants must submit their applications by 2021-11-16. (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 $200,000.00 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 PAR 19 385

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