Efficient septum formation is essential for chromosome segregation in Bacillus subtilis when SMC function is impaired.

Efficient septum formation is essential for chromosome segregation in Bacillus subtilis when SMC function is impaired, with minJ and divIVA becoming essential in this context.

• Why it matters: Understanding how chromosome segregation is maintained when SMC activity is reduced addresses gaps in knowledge about the interdependence of chromosome organization and cell division, which is crucial for bacterial cell viability.
• What they did: Researchers performed a synthetic lethal screen using a hypomorphic smc allele in Bacillus subtilis and identified that mutations in minJ and divIVA are essential for viability, with deletion of minD restoring segregation and viability.
• The result: The findings support a model where proper septum formation promotes chromosome terminus segregation via SpoIIIE-mediated DNA clearance, highlighting the critical link between cell division and chromosome segregation.