SALL1 is a transcriptional regulator essential for organogenesis, particularly kidney and reproductive tract development. As a transcriptional repressor, SALL1 plays a critical role in ureteric bud invasion during kidney development and functions as a marker of nephron progenitor cells 1. SALL1 is required for proper metanephric kidney development; loss of SALL1 in pigs results in nephric-defective embryos unable to form organized kidney structures 2. Beyond kidneys, SALL1 contributes to genital tract development and functions in folliculogenesis during female reproductive development 3. In the brain, SALL1 cooperates with IRF8 and PU.1 to establish the epigenetic landscape directing postnatal microglia identity and development 4. SALL1 undergoes SUMOylation, a posttranslational modification that regulates its protein-protein interactions 5. Mutations in SALL1 cause Townes-Brocks syndrome, a rare autosomal dominant disorder with highly heterogeneous clinical features including renal abnormalities 6. The syndrome demonstrates variable genotype-phenotype correlation, with specific SALL1 mutations correlating to distinct renal manifestations. These findings establish SALL1 as a pleiotropic developmental regulator with critical roles spanning kidney organogenesis, reproductive system development, and immune cell specification.