Kri1, also known as KRR1 interacting protein, is essential for 40S ribosome biogenesis in the nucleolus. It physically and functionally interacts with Krr1p to form a complex crucial for this process [2]. Kri1 is also involved in other biological processes and diseases. It has been associated with iron deficiency anemia, as rare mutations in Kri1 in a patient may potentially cause intestinal iron loss [3]. In esophageal carcinoma, Kri1 was identified as one of the ferroptosis-related key genes, with the highest mutation frequency among certain genes, and its associated prognostic complex value could predict patient survival and tumor-infiltrating immune cells [1].

In C. elegans, Kri1 (KRI-1 ortholog of mammalian KRIT1/CCM1) exists in a complex with CCM-2 in the intestine. This complex negatively regulates the ERK-5/MAPK pathway, allowing the expression of the SLC39 zinc transporter gene zipt-2.3 to sequester zinc in the intestine. Ablation of KRI-1 leads to reduced zinc sequestration, inhibition of IR-induced MPK-1/ERK1 activation, and apoptosis in the germline [4].

In conclusion, Kri1 plays essential roles in ribosome biogenesis, and its functions in iron metabolism-related anemia and apoptosis regulation through zinc homeostasis are significant. Studies in model organisms like C. elegans have provided insights into its role in disease-related processes, such as the potential link between zinc localization and cerebral cavernous malformation disease [4].