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New research identifies specific thyroglobulin (Tg) gene variants linked to hypothyroidism and levothyroxine (LT4) usage. Some variants impair thyroid hormone secretion, while others may relate to autoimmune thyroid disease, paving the way for precision medicine.

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Area of Science:

  • Endocrinology
  • Genetics
  • Molecular Biology

Background:

  • Hypothyroidism is a common endocrine disorder caused by insufficient thyroid hormone production.
  • Thyroglobulin (Tg) gene variants are numerous, but many have uncertain clinical significance.
  • Understanding Tg genotype-phenotype relationships is crucial for managing thyroid disorders.

Purpose of the Study:

  • To investigate the disease association of undercharacterized thyroglobulin (Tg) gene variants using the large-scale All of Us biobank.
  • To identify specific Tg variants linked to thyroid function and levothyroxine (LT4) usage.
  • To elucidate the molecular mechanisms underlying the pathophysiology of identified Tg variants.

Main Methods:

  • Utilized the All of Us biobank to correlate Tg variant presence with thyroid-stimulating hormone levels and LT4 usage.
  • Performed molecular characterization in Fisher rat thyroid cells to assess variant secretion efficiency.
  • Employed affinity purification-mass spectrometry to analyze protein interactions and identify affected pathways.

Main Results:

  • Identified R152H, Q870H, A993T, P1012L, and P1494L variants associated with increased LT4 usage and decreased thyroid function.
  • Found R320C variant linked to decreased thyroid function.
  • Demonstrated that R152H, Q870H, and R320C variants have reduced secretion efficiency due to protein quality control defects.
  • Showed A993T and P1494L variants interact with degradation and antigen-presentation pathways, potentially linking them to Hashimoto's disease and elevated anti-TPO antibodies.

Conclusions:

  • Specific Tg variants have distinct pathophysiological mechanisms affecting thyroid function.
  • The Q870H variant is a potential target for molecular therapies to restore secretion, offering precision medicine beyond LT4 replacement.
  • Combining biobank data with molecular studies is effective for understanding Tg genotype-to-phenotype relationships and advancing precision thyroidology.