KNTC1

KNTC1 is required for cancer cell survival and proliferation, with loss-of-function studies in esophageal squamous cell carcinoma showing that its knockdown suppresses viability and induces apoptosis (PMID:30628654). In non-small-cell lung cancer, KNTC1 depletion inhibits proliferation, migration, invasion, and xenograft tumor formation, and positions KNTC1 upstream of the proteasome subunit PSMB8 in driving tumor progression (PMID:35933405). Pathway-level correlation links KNTC1 expression to mitotic spindle activity (PMID:30628654), but the direct molecular mechanism of KNTC1 function has not been characterized in the available corpus; all current evidence is phenotypic knockdown data without rescue, epistasis, or direct biochemical validation.

1. 2019 Low

   Established that KNTC1 is functionally required for cancer cell survival rather than merely a correlate, by showing its depletion kills esophageal carcinoma cells.

   Evidence Lentiviral shRNA knockdown with MTT viability and Annexin V apoptosis assays in ESCC cell lines, plus GSEA of expression datasets

   PMID:30628654

   Open questions at the time

   • No rescue experiment to confirm on-target effect
   • Mitotic spindle association is correlative GSEA only, not a direct mechanistic link
   • No identification of KNTC1 molecular partners or substrates
2. 2022 Low

   Extended the requirement for KNTC1 to lung cancer proliferation, invasion, and in vivo tumor growth, and attempted to place it in a pathway upstream of PSMB8.

   Evidence Lentiviral shRNA knockdown with proliferation, wound-healing, transwell invasion, flow cytometry, and nude-mouse xenograft assays in NSCLC, with downstream PSMB8 expression analysis

   PMID:35933405

   Open questions at the time

   • PSMB8 relationship is correlative, not validated by rescue or direct interaction
   • No biochemical demonstration of how KNTC1 regulates PSMB8
   • Mechanism connecting KNTC1 to migration/invasion phenotypes unresolved

• The direct molecular function of KNTC1 — its biochemical activity, binding partners, and the mechanistic basis of its purported kinetochore/spindle role — remains undefined in the available corpus.
• No biochemical or structural characterization of KNTC1
• No validated interaction partners identified
• Causal mechanism linking KNTC1 to the proteasome and to mitotic phenotypes not established