Functionally Annotating Regulatory Elements in the Equine Genome Using Histone Mark ChIP-Seq.

Area of Science:

• Genomics
• Epigenetics
• Animal Science

Background:

• The Functional Annotation of Animal Genomes (FAANG) initiative aims to characterize tissue-specific genome regulation.
• Understanding equine genome regulation is vital for research into horse health, performance, and reproduction.

Purpose of the Study:

• To map four key histone modifications (H3K4me1, H3K4me3, H3K27ac, H3K27me3) in eight equine tissues.
• To identify tissue-specific regulatory elements within the equine genome.
• To generate publicly available annotation data for advancing equine studies.

Main Methods:

• Chromatin immunoprecipitation followed by sequencing (ChIP-Seq) was performed on eight prioritized tissues from two Thoroughbred mares.
• Data quality was ensured through optimized experimental parameters, six quality metrics, replicate comparisons, and site-specific evaluations.
• Tissue-specific binding motifs were identified and characterized using gene ontology (GO) and protein-protein interaction analyses.

Main Results:

• Successfully mapped four histone modifications across eight equine tissues.
• Identified unique active regulatory regions and associated binding motifs.
• Characterized motifs to understand tissue-specific gene regulation.

Conclusions:

• This study provides foundational epigenetic resources for the equine genome.
• The generated data are valuable for future equine research focusing on economically important traits.
• These annotations will facilitate a deeper understanding of tissue-specific gene regulation in horses.