A complex path for domestication of B. subtilis sociality

Area of Science:

• Microbiology
• Genetics
• Molecular Biology

Background:

• Microorganisms in laboratory settings often undergo genetic changes, losing traits like biofilm formation.
• Bacillus subtilis lab strains typically lack the ability to form complex biofilms.
• The ancestral strain, considered a wild-type, possesses an unusual mutation in its RapP-PhrP quorum-sensing system.

Purpose of the Study:

• To investigate the impact of an atypical mutation in the RapP-PhrP quorum-sensing system on the biofilm phenotype of Bacillus subtilis.
• To understand the process of microbial domestication and its genetic consequences.

Main Methods:

• Comparative analysis of biofilm formation between ancestral and lab-adapted Bacillus subtilis strains.
• Genetic characterization of the RapP-PhrP quorum-sensing system in the ancestral strain.
• Phenotypic analysis of biofilm structure and matrix association.

Main Results:

• The ancestral strain's mutation in the RapP-PhrP system profoundly influences its biofilm-forming capabilities.
• This mutation alters the complex, matrix-associated structures characteristic of robust biofilms.
• Lab adaptation leads to the loss of genetic systems essential for biofilm development in Bacillus subtilis.

Conclusions:

• The study highlights the significant role of the RapP-PhrP quorum-sensing system in Bacillus subtilis biofilm formation.
• Microbial domestication involves genetic streamlining that can lead to the loss of complex traits.
• Understanding these adaptations provides valuable insights into bacterial evolution and laboratory strain behavior.