Methylation differences and expression profiles of the caprine DIO3 gene

Area of Science:

• Genomics
• Epigenetics
• Developmental Biology

Background:

• The DIO3 gene, encoding type 3 iodothyronine deiodinase, is imprinted and crucial for thyroid hormone regulation during embryogenesis.
• Regulatory mechanisms of the imprinted DIO3 gene in goats during development remain unclear.

Purpose of the Study:

• To investigate DNA methylation patterns of the caprine DIO3 intragenic CpG island.
• To quantify DIO3 gene expression levels in various neonatal goat tissues.
• To explore the relationship between DNA methylation and DIO3 gene expression in goats.

Main Methods:

• Quantitative reverse transcription-polymerase chain reactions (qRT-PCRs) for gene expression analysis.
• Bisulfite-sequencing PCRs for identifying DNA methylation patterns.
• Analysis of six tissues from 3-day-old Chinese Nanjiang Yellow kids.

Main Results:

• Modest and non-significant DNA methylation patterns observed across brain, heart, liver, kidney, lung, and longissimus dorsi tissues (26.48–34.92%).
• Significantly higher DIO3 mRNA expression (P < 0.05) was detected in liver tissue compared to other tissues.
• No significant correlation (P > 0.05) found between DIO3 gene methylation and its expression levels.

Conclusions:

• Caprine DIO3 gene expression is not directly regulated by its intragenic CpG island methylation.
• Other regulatory elements likely influence DIO3 gene expression in goats.
• This study provides foundational data on DIO3 gene methylation and expression patterns in goats, contributing to understanding the DLK1-DIO3 imprinted domain.