Participates in a DNA-damage check-point that is active prior to asymmetric division when DNA is damaged. Forms globular foci that rapidly scan along the chromosomes during sporulation, searching for lesions. Its ability to scan through the chromosome rapidly is due to its nonspecific DNA-binding. When a lesion is present, DisA pauses at the lesion site. This triggers a cellular response that culminates in a temporary block in sporulation initiation. It is required, at least partially, to inhibit the activity of the transcription factor spo0A, which controls, among others, early sporulation genes.