Thyroid State Regulates Gene Expression in Human Whole Blood

Area of Science:

• Molecular Biology
• Genomics
• Endocrinology

Background:

• Clinical manifestations of thyroid hormone (TH) imbalance are well-known.
• The specific genes regulated by TH in human tissues remain largely uncharacterized.

Purpose of the Study:

• To investigate the impact of TH on gene expression profiles in human whole blood.
• To identify genes regulated by TH, focusing on T3 receptor (TR) α-expressing cells within blood.

Main Methods:

• Employed next-generation RNA sequencing on whole blood samples from athyroid patients.
• Analyzed gene expression changes using paired differential expression analysis and validated findings.
• Utilized Weighted Gene Coexpression Network Analysis (WGCNA) to identify thyroid state-related gene networks.

Main Results:

• Identified 486 differentially expressed genes (fold-change >1.5, P < 0.05), with 76% positively regulated by TH.
• Gene Ontology analysis highlighted 'translational elongation' as a significantly overrepresented biological process.
• WGCNA revealed gene clusters correlated with thyroid status, suggesting TH influences platelet function.

Conclusions:

• Thyroid status significantly alters gene expression in human whole blood, primarily in TRα-expressing leukocytes.
• Evidence suggests thyroid hormone may also regulate gene transcripts within platelets.