Iron Status, Thyroid Dysfunction, and Iron Deficiency Anemia: A Two-Sample Mendelian Randomization Study.

Area of Science:

• Endocrinology
• Genetics
• Nutritional Science

Background:

• Thyroid dysfunction and iron deficiency anemia (IDA) are clinically associated.
• Shared associations with iron status suggest a potential link between these conditions.

Purpose of the Study:

• To investigate the causal relationship between iron status and thyroid dysfunction.
• To examine the risk of IDA in relation to thyroid dysfunction.

Main Methods:

• A two-sample Mendelian randomization (MR) study was performed.
• Utilized large-scale European population genome-wide association study databases.
• Employed inverse variance-weighted (IVW), weighted median, and MR-Egger methods with sensitivity analyses.

Main Results:

• No significant causal relationship was found between serum iron status markers and thyroid dysfunction.
• A significant causal relationship was observed between hypothyroidism and an elevated risk of IDA (OR = 1.101, p < 0.001).
• Sensitivity analyses confirmed the robustness of the findings.

Conclusions:

• Upregulation of hypothyroidism-associated genes is linked to increased IDA risk in Europeans.
• Findings suggest potential novel therapeutic strategies for managing hypothyroidism and IDA comorbidities.
• Highlights the importance of considering iron status in patients with thyroid dysfunction.