Dcun1d2, defective in cullin neddylation 1, domain containing 2, is related to the neddylation process, a reversible post-translational modification where NEDD8 binds covalently to substrate proteins [2]. It may be involved in the formation and maintenance of certain cellular structures, and its concentration in the paranodal myelin of the peripheral nervous system suggests a role in the peripheral nerves [2].

Integrative radiogenomic analysis of glioblastoma found that DCUN1D2 was among twelve representative genes with high correlation across copy number variation, gene expression and patient outcome. Multicentric glioblastoma, which has a worse prognosis than solitary glioblastoma, showed associated genomic changes in DCUN1D2 along with other genes [1]. In male Wistar Kyoto (WKY) rats with endogenous depression, Dcun1d2 was identified as a differentially-expressed protein in the medial prefrontal cortex, suggesting a potential link to depression-like phenotypes [3]. In pigs, breed-differential copy number variations (CNVs) were found in the DCUN1D2 gene between Tongcheng and Large White pigs, potentially related to phenotypic differences between the two breeds [4]. 5-azacytidine, a DNA methyltransferase inhibitor, up-regulates Dcun1d2 in T-cells, leading to cell-growth arrest and having an immunomodulatory effect, which may be useful in preventing graft-versus-host disease in transplantation settings [5]. A chromosome 13q34 duplication including DCUN1D2 was identified in a patient with dystonia, facial dysmorphism, intellectual disability and breast cancer, and the genes within the duplication showed higher expression [6].

In conclusion, Dcun1d2 appears to be involved in multiple biological processes and disease conditions. Its role in neddylation and its association with glioblastoma prognosis, depression-like phenotypes in rats, breed-specific traits in pigs, immunomodulation in transplantation, and human genetic disorders demonstrate its significance. Functional studies, potentially including gene knockout or conditional knockout mouse models in the future, could further clarify its specific functions in these biological processes and disease areas.