BCKDHB and triple-A syndrome: Figure 5E depicts the expression levels of the five signature genes. In the AS group, the expression values of PCBD1, ACADL, BCKDHB, and IDH3G were found to be downregulated, whereas the expression value of MGLL was upregulated. Similarly, utilizing these five characteristic genes, we developed a nomogram specifically for AAA patients. The results obtained from the nomogram were largely in agreement with the findings described earlier (Figures 5F–J).