The Study
Mutation of the Secys residue 266 in human type 2 selenodeiodinase alters 75Se incorporation without affecting its biochemical properties.
This study is like taking apart a single part of a toy car in a lab and seeing if it still moves when you change one screw. It tells you what happens to that one screw, but it doesn't tell you if the whole car still works on the road, or if changing that screw affects how fast the car goes in real life.
Analysis score
Maximum 58 for a case-control study.
Where the score came from
Scientists changed a tiny part of a thyroid enzyme that usually uses selenium, and found it still worked fine even without selenium there.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 527 / 100
Quality score
Researchers compare people who have a condition (cases) with similar people who do not (controls), looking back in time for differences in exposure. Useful but more prone to bias.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This means the selenium at this spot isn't needed for the enzyme to work in a lab dish, but it might still matter in the body.
- 2Changing the selenium amino acid at position 266 stopped selenium-75 from being used, but the enzyme still converted T4 to T3 normally.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Related Content
Claims (2)
The body converts the thyroid hormone T4 into its active form, T3, using enzymes that require selenium as a component.
Changing a specific amino acid in the human type 2 deiodinase enzyme reduces its ability to take up selenium-75 in laboratory-grown human cells, but does not change its ability to remove iodine from thyroid hormones, suggesting this amino acid is not required for the enzyme's core function in this setting.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.