High Throughput Screening (HTS) to Discover Chemical Probes (R21) | Apply Online

Opportunity Summary:

The NIH funding opportunity PAR 14-283, titled "High Throughput Screening (HTS) to Discover Chemical Probes (R21)," was a discretionary grant program designed to support early-stage, exploratory research that uses high throughput screening to find and optimize small-molecule chemical probes. The core idea behind the announcement was to push investigators to partner with an established HTS facility (academic, nonprofit, or commercial) that already has the practical infrastructure and track record needed to run robust, HTS-ready assays. In other words, this was not meant to fund teams that are still building basic screening capacity from scratch; it was aimed at projects that can realistically execute screening campaigns and produce credible probe-like molecules and biological insights within an R21-style scope.

Programmatically, the FOA focused on two closely related outcomes. First, it sought the discovery and development of novel small molecules that can be used as chemical probes, meaning compounds that help researchers interrogate biological pathways, validate therapeutic hypotheses, and study disease-relevant mechanisms in a controlled and reproducible way. Second, it aimed to enable the discovery and/or validation of novel biological targets, using screening results and follow-up studies to identify targets that matter for disease biology and to strengthen the evidence that modulating those targets produces meaningful effects. Across both outcomes, NIH signaled that the strongest projects would be those that generate genuinely new insight into important disease targets and processes, rather than incremental screening efforts with limited downstream interpretability.

The mechanism was an NIH R21, which generally aligns with higher-risk, earlier-proof-of-concept projects where the goal is to establish feasibility, generate key preliminary data, and open a path to more substantial follow-on work. Consistent with that intent, the announcement emphasized collaboration with experienced screening centers capable of implementing assays in formats suitable for large-scale screening, including the practical elements that make HTS productive: assay robustness, reproducibility, quality control, and the ability to triage hits into tractable chemical series. While the summary text does not list detailed scientific requirements, the framing implies that applications needed to show a clear, disease-relevant biological question; an assay that can be run at HTS scale; a credible plan to identify hits and then confirm and refine them into probe-quality compounds; and a path from compounds to biological conclusions about targets or mechanisms.

The opportunity was tied to NIH mission areas represented by multiple CFDA program numbers, reflecting broad biomedical relevance. These included research areas such as deafness and communication disorders (93.173), mental health (93.242), alcohol research (93.273), drug abuse and addiction (93.279), cancer detection/diagnosis and treatment (93.394 and 93.395), arthritis and musculoskeletal/skin diseases (93.846), child health and human development (93.865), aging (93.866), and vision research (93.867). Practically, that breadth meant proposed screening and probe-development projects could fit many disease and biological contexts as long as they aligned with the missions of participating NIH Institutes and produced target- or mechanism-level insight.

On funding and administrative details, the FOA listed an estimated total funding amount of $200,000 and an award ceiling of $200,000, with no cost sharing or matching requirement. The opportunity was posted and created on July 17, 2014, with an original and current closing date of September 7, 2017, and an archive date of October 8, 2017, meaning it is no longer an active competition. The funding instrument type was a grant, and the activity category was listed under Education, Health, Income Security and Social Services, consistent with federal cataloging rather than the narrow scientific content.

Eligibility was intentionally broad and included many organizational types: public and private institutions of higher education, nonprofits (including 501(c)(3) and certain non-501(c)(3) organizations), small businesses, for-profit entities other than small businesses, independent school districts, and multiple levels of government (state, county, city/township, special districts), as well as public housing authorities and tribal entities. The FOA also explicitly expanded eligibility to include organizations 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, and eligible federal agencies. Importantly, non-U.S. entities and foreign institutions were eligible to apply, non-U.S. components of U.S. organizations were eligible, and foreign components (as defined by NIH policy) were allowed, which opened the door to international participation when justified scientifically and administratively.

In summary, PAR 14-283 was an NIH R21 grant opportunity aimed at accelerating the discovery of small-molecule chemical probes and the validation of disease-relevant biological targets through partnerships with capable HTS facilities. The NIH emphasis was not just on running screens, but on using screening to generate high-value biological understanding and credible probe candidates that can meaningfully advance disease-mechanism research and, ultimately, therapeutic hypothesis development.

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