FAM120AOS, or family with sequence similarity 120A opposite strand, codes for uncharacterized protein FAM120AOS, which currently has no known function.[3] The gene ontology describes the gene to be protein binding.[4] Overall, it appears that the thyroid and the placenta are the two tissues with the highest expression levels of FAM120AOS across a majority of datasets.
The microarray-assessed tissue expression pattern of multiple normal tissues for FAM120AOS in humans was found using GDS3834 data.[5] The three tissues in the 90th percentile and higher for FAM120AOS gene expression are as follows: the bladder, epididymis, and thyroid. The thyroid is in the 91st percentile, while the other two are in the 90th percentile. Since high thyroid expression was also seen across the RNA-seq data,[6][7][8][9] it appears that FAM120AOS expression may be important in the thyroid.