Which of the following is a plausible implication of Netrin-1 signaling disruption in colorectal tissue?

• A. Decreased risk of cancer
• B. No effect on cell fate
• C. Immediate tissue repair
• D. Tumor formation

Answer: (D)

Netrin-1 helps coordinate cell survival and proper organization in colorectal epithelium by signaling through dependence receptors like DCC and UNC5. When netrin-1 is present, these receptors suppress apoptosis, helping cells persist in a controlled pattern that maintains tissue structure. If netrin-1 signaling is disrupted, the usual checks on cell fate and proliferation become destabilized. In a tissue that already carries mutations or experiences inflammatory signals, this instability can drive abnormal cell growth, loss of architectural control, and accumulation of further mutations, increasing the likelihood of neoplastic transformation and tumor formation. So tumor formation is a plausible implication because disrupting netrin-1 signaling can undermine normal regulation of cell survival and tissue organization, creating conditions that favor cancer development. The other options don’t fit as well: disrupting this pathway is not expected to lower cancer risk, have no effect on cell fate, or lead to immediate, flawless tissue repair.