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Ex situ reared black-footed ferrets exhibit altered sperm DNA methylation
Alexandra L DeCandia1,2, Stavi R Tennenbaum3, Rachel Santymire4,5
1Department of Biology, Georgetown University, Washington, DC, USA.
Environmental conditions may alter sperm DNA methylation in ex situ black-footed ferrets (Mustela nigripes), potentially causing reduced reproductive fitness. This epigenetic change is linked to conservation challenges for endangered species.
Area of Science:
- Conservation Biology
- Epigenetics
- Reproductive Biology
Background:
- Endangered species often require ex situ (off-site) management due to external threats.
- Ex situ environments can lead to reduced reproductive fitness, termed environmentally-determined inbreeding depression.
- Black-footed ferrets (Mustela nigripes) are a North American endemic species reliant on ex situ conservation.
Purpose of the Study:
- To investigate epigenetic differences, specifically sperm DNA methylation, as a mechanism for environmentally-determined inbreeding depression in black-footed ferrets.
- To explore the influence of environmental context on sperm DNA methylation in ex situ versus in situ individuals.
Main Methods:
- Collected sperm samples from 12 ex situ and 5 in situ black-footed ferrets.
- Analyzed sperm DNA methylation patterns between the two groups.
- Identified differentially methylated regions and enriched gene ontology terms.
Main Results:
- Ex situ black-footed ferrets exhibited significantly higher average sperm DNA methylation compared to in situ individuals.
- >500 differentially methylated regions were identified between ex situ and in situ sperm.
- Enriched gene ontology terms related to reproduction and development, including genes linked to spermatogenesis and fertilization.
Conclusions:
- Environmental conditions in ex situ settings may alter sperm DNA methylation in black-footed ferrets.
- These epigenetic changes may contribute to decreased reproductive success in ex situ populations.
- Findings offer insights into molecular mechanisms of inbreeding depression and inform conservation strategies for endangered wildlife.
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