Ûi-thoân-chú hoat-hiān (eng. gene expression; ji̍t. 遺伝子発現) sī ûi-thoân-chú ê chu-sìn siū lī-ēng lâi ha̍p-sêng ki-lêng-sèng ûi-thoân-chú sán-bu̍t (gene product) ê kòe-têng. Hia ê san-bu̍t it-poaⁿ sī nn̄g-pe̍h-chit, chóng ia̍h ū hui nn̄g-pe̍h-chit ê pian-bé ûi-thoân-chú tī--leh, pí-lūn choán-sàng RNA (tRNA), ia̍h sió-hu̍t-chú RNA (snRNA) ûi-thoân-chú, in ê sán-bu̍t sī ki-lêng-sèng RNA.