Somatic Evolution of Stem Cell Mutations in Long-Lived Plants

Area of Science:

• Plant biology
• Evolutionary genetics
• Molecular biology

Background:

• Long-lived perennial plants accumulate somatic mutations over time.
• Mutations in shoot apex stem cells can spread throughout the plant due to cell lineage dynamics.
• Understanding somatic mutation accumulation requires knowledge of stem cell population size, bottleneck effects, and mutation rates.

Purpose of the Study:

• To develop a method for estimating key parameters of somatic mutation evolution in plants.
• To quantify the effective stem cell population size, bottleneck strength, and mutation rate in vivo.
• To address the lack of existing in vivo methods for studying plant somatic evolution.

Main Methods:

• Utilizing cell-layer-enriched DNA sequencing data.
• Applying novel analytical approaches to estimate population and evolutionary parameters.
• Developing an in vivo method for studying somatic mutations.

Main Results:

• Demonstrated that essential parameters of somatic evolution can be directly estimated from DNA sequencing data.
• Provided a method to quantify stem cell population size, bottleneck strength, and mutation rate.
• Filled a critical gap in the available methodologies for in vivo study of plant somatic evolution.

Conclusions:

• The developed DNA sequencing approach enables direct estimation of somatic mutation parameters in plants.
• This method offers new insights into the processes driving somatic evolution in long-lived perennials.
• The findings pave the way for future research into the genetic basis of plant aging and adaptation.