Cultivating the uncultured: limits, advances and future challenges.

Area of Science:

• Microbiology
• Biotechnology

Background:

• The Petri dish has enabled microbial cultivation, leading to the isolation of novel prokaryotes and insights into microbial physiology.
• Despite advances, microbial cultivation remains a low-throughput process, primarily hindered by a lack of knowledge regarding specific species' requirements.

Purpose of the Study:

• This review focuses on the limiting factors in microbial cultivation.
• It discusses obstacles such as the loss of cell-cell communication and proposes future research directions.

Main Methods:

• Review of existing literature on microbial cultivation challenges and innovations.
• Analysis of factors limiting the isolation of uncultured microbial taxa.
• Discussion of strategies to overcome cultivation hurdles.

Main Results:

• Microbial cultivation is still a low-throughput process, despite significant efforts to improve efficiency.
• Key obstacles include insufficient knowledge of target species and the loss of microbial cell-cell communication upon isolation.
• Novel redox-active prokaryotes and uncultured taxa have been isolated, but challenges persist.

Conclusions:

• A combination of refined culture media, strategies leveraging cell-cell communication, and high-throughput innovations is essential.
• These integrated approaches are urgently needed to cultivate currently uncultured species.
• Successful cultivation of uncultured microbes will usher in a new era in microbiology.