Mitochondrial complex I (NADH:ubiquinone oxidoreductase) is the largest enzyme of the oxidative phosphorylation system. Its function is essential for bioenergetics and redox balance. Altered expression of its subunits can lead to changes in tumor metabolism, reactive oxygen species (ROS) generation, and apoptotic sensitivity—all of which may impact tumor growth and patient outcomes.
Commonly Reported Complex I Subunit:
-Increased expression of NDUFA4L2 has been associated with poor prognosis
-Reduced expression of core complex I subunits (such as NDUFS1 and NDUFS3) may correlate with a poorer overall survival in some cancers
-NDUFV1 have been linked to adverse clinical outcomes
-Dysregulation of complex I may alter ROS production. In some cancers, controlled ROS production can aid in signaling that promotes cell proliferation or survival, while excessive ROS can trigger cell death. Genes like NDUFA4L2 are also linked with hypoxia, a common feature in the tumor microenvironment.
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