Based on limited published evidence, FAM227B is a gene of unknown intrinsic function with emerging associations to thyroid dysfunction. Recent multi-omics analysis identified FAM227B as a key candidate gene for hyperthyroidism through cross-tissue transcriptome-wide association and polygenic prioritization 1. GTEx colocalization analysis confirmed significant tissue-specific colocalization between FAM227B and hyperthyroidism signals in the adrenal gland, lung, and minor salivary gland 1. Phenome-wide association studies linked FAM227B to cardiovascular disease associations 1. However, the mechanistic basis for FAM227B's role in thyroid dysfunction and its biochemical function remain uncharacterized.