CTIF是CBP80（NCBP1；MIM 600469）/CBP20（NCBP2；MIM 605133）翻譯起始復合物的一個組成部分，該復合物與新生mRNA的帽端共轉錄結合cbp80/cbp20復合物參與同時編輯和翻譯步驟，該步驟識別mrnas中的過早終止密碼子（ptc），并將含有mrnas的ptc導向無義介導的衰變（nmd）。在沒有PTCs的mRNA上，CBP80/CBP20復合物被細胞質mRNA cap結合蛋白取代，包括EIF4G（MIM 600495），mRNA的穩態翻譯在細胞質中恢復（Kim等人，2009【PubMed 19648179】。【OMIM提供，2009年12月】
CTIF is a component of the CBP80 (NCBP1; MIM 600469)/CBP20 (NCBP2; MIM 605133) translation initiation complex that binds cotranscriptionally to the cap end of nascent mRNA. The CBP80/CBP20 complex is involved in a simultaneous editing and translation step that recognizes premature termination codons (PTCs) in mRNAs and directs PTC-containing mRNAs toward nonsense-mediated decay (NMD). On mRNAs without PTCs, the CBP80/CBP20 complex is replaced with cytoplasmic mRNA cap-binding proteins, including EIF4G (MIM 600495), and steady-state translation of the mRNAs resumes in the cytoplasm (Kim et al., 2009 [PubMed 19648179]).[supplied by OMIM, Dec 2009]