MIS18A

MIS18A is a cell cycle-regulated protein implicated in cancer cell proliferation and migration, but its own biochemical mechanism is largely uncharacterized in the available corpus. Its expression is downregulated by Fam72a in a cell cycle-dependent manner following EGF mitogen stimulation, which biases signaling away from the AKT1 route toward MAPK1 to promote proliferation (PMID:41414706). At the protein level, MIS18A is physically bound by ZNF471, and this interaction is associated with negative regulation of Wnt/β-catenin signaling and epithelial-mesenchymal transition, suppressing proliferation and metastasis in hepatocellular carcinoma cells and increasing sensitivity to apatinib and donafenib (PMID:42155792). Consistent with a pro-proliferative role, siRNA knockdown of MIS18A in lung adenocarcinoma cells reduces proliferative and migratory capacity (PMID:38910901). Beyond these expression-level and interaction-level observations, the molecular activity by which MIS18A executes these functions has not been characterized in the available corpus.

1. 2024 Low

   Established that MIS18A is functionally required for cancer cell proliferation and migration rather than merely correlated with disease, by testing the consequence of its depletion.

   Evidence siRNA knockdown with viability/migration assays and RT-qPCR in lung adenocarcinoma cells

   PMID:38910901

   Open questions at the time

   • Single knockdown approach without rescue or mechanistic dissection of MIS18A's molecular function
   • No identification of direct downstream effectors
   • Pathway involvement inferred rather than reconstituted
2. 2025 Low

   Addressed how MIS18A levels are controlled during the cell cycle, showing Fam72a downregulates MIS18A upon EGF stimulation to redirect signaling and favor proliferation.

   Evidence Overexpression/knockdown with EGF stimulation, western blot, and signaling pathway analysis

   PMID:41414706

   Open questions at the time

   • MIS18A treated as a downstream target without dissection of its own function
   • Mechanism linking MIS18A levels to AKT1 vs MAPK1 balance unresolved
   • Single lab, single method set
3. 2026 Low

   Identified a direct physical partner of MIS18A, placing it in a ZNF471-MIS18A axis that negatively regulates Wnt/β-catenin signaling, EMT, and drug sensitivity in hepatocellular carcinoma.

   Evidence Co-immunoprecipitation, transcriptome sequencing, functional assays, and pathway reporter assays in HCC cells

   PMID:42155792

   Open questions at the time

   • Biochemical mechanism by which MIS18A acts on Wnt/β-catenin not dissected
   • No orthogonal validation of the interaction specified
   • Interaction interface and stoichiometry unknown

• The intrinsic molecular activity of MIS18A and how it mechanistically couples its protein interactions to signaling outcomes remain unknown.
• No defined enzymatic or structural molecular function
• No subcellular localization established in the corpus
• Direct biochemical link to Wnt/β-catenin or AKT1/MAPK1 not reconstituted