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Hepatic gene expression transcript counts in liver samples of American kestrels

Metadata Updated: January 21, 2026

A number of brominated flame retardants (BFRs) have been reported to interfere with the thyroid signaling pathway and cause oxidative stress in birds, yet the underlying shifts in gene expression associated with these effects remain poorly understood. In this study, we measured hepatic transcriptional responses of 31 genes in American kestrel hatchlings following in ovo exposure to one of three high-volume alternative BFRs: 1,2-bis(2,4,6-tribromophenoxy) ethane (BTPBE), bis(2-ethylhexyl)-2,3,4,5-tetrabromophthalate (TBPH), or 2-ethylhexyl-2,3,4,5-tetrabromobenzoate (EHTBB). Hatchling kestrels exhibited shifts in the expression of genes related to oxidative stress (CYP, GSTA, SOD, GPx), thyroid hormone metabolism and transport (DIO, TTR), lipid and protein metabolism (PPAR, HMGCR, FAB1, LPL), and cytokine-mediated inflammation (TLR, IL-18, IRF7, STAT3, RACK1, CEBPB). Male and female hatchlings differed in which genes were differentially expressed as well as the direction of the effect (up- vs. down-regulation). These results build upon our previous findings of increased oxidative stress and disrupted thyroid signaling pathway in the same hatchlings. Furthermore, our results indicate that inflammatory responses appear to occur in female hatchlings exposed to BTBPE and EHTBB in ovo. Gene expression analysis revealed multiple affected pathways, adding to the growing evidence that sublethal physio-logical effects are complex and are a concern for birds exposed to BTBPE, EHTBB, or TBPH in ovo.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Created Date January 12, 2026
Metadata Updated Date January 21, 2026

Metadata Source

Harvested from DOI USGS DCAT-US

Additional Metadata

Resource Type Dataset
Metadata Created Date January 12, 2026
Metadata Updated Date January 21, 2026
Publisher U.S. Geological Survey
Maintainer
Identifier http://datainventory.doi.gov/id/dataset/USGS_6303ab42d34ed6dc5592a397
Data Last Modified 2023-07-26T00:00:00Z
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://ddi.doi.gov/usgs-data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Datagov Dedupe Retained 20260121062710
Harvest Object Id e7358a11-12da-440b-95a7-0ad35bad2286
Harvest Source Id 2b80d118-ab3a-48ba-bd93-996bbacefac2
Harvest Source Title DOI USGS DCAT-US
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": -77.9398, 39.0345, -77.9398, 39.3582, -76.7889, 39.3582, -76.7889, 39.0345, -77.9398, 39.0345}
Source Datajson Identifier True
Source Hash 2bfeeb9c8ebbdb6c85825048c1923a4d5ba4429538aa3a33e93b25be94f08625
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -77.9398, 39.0345, -77.9398, 39.3582, -76.7889, 39.3582, -76.7889, 39.0345, -77.9398, 39.0345}

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