Reacquisition of light-harvesting genes in a marine cyanobacterium confers a broader solar niche

Nikea J. Ulrich, Hiroko Uchida, Yu Kanesaki, Euichi Hirose, Akio Murakami, Scott R. Miller

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The evolution of phenotypic plasticity, i.e., the environmental induction of alternative phenotypes by the same genotype, can be an important mechanism of biological diversification.1,2 For example, an evolved increase in plasticity may promote ecological niche expansion as well as the innovation of novel traits;3 however, both the role of phenotypic plasticity in adaptive evolution and its underlying mechanisms are still poorly understood.4,5 Here, we report that the Chlorophyll d-producing marine cyanobacterium Acaryochloris marina strain MBIC11017 has evolved greater photosynthetic plasticity by reacquiring light-harvesting genes via horizontal gene transfer. The genes, which had been lost by the A. marina ancestor, are involved in the production and degradation of the light-harvesting phycobiliprotein phycocyanin. A. marina MBIC11017 exhibits a high degree of wavelength-dependence in phycocyanin production, and this ability enables it to grow with yellow and green light wavelengths that are inaccessible to other A. marina. Consequently, this strain has a broader solar niche than its close relatives. We discuss the role of horizontal gene transfer for regaining a lost phenotype in light of Dollo's Law6 that the loss of a complex trait is irreversible.

Original languageEnglish
Pages (from-to)1539-1546.e4
JournalCurrent Biology
Volume31
Issue number7
DOIs
StatePublished - Apr 12 2021

Funding

We thank three anonymous reviewers for their comments and Heidi Abresch and Andy Oman for their help maintaining Acaryochloris cultures. This work was supported by award NNA15BB04A from the National Aeronautics and Space Administration to S.R.M. and JSPS KAKENHI award 23370013 to A.M.

FundersFunder number
National Aeronautics and Space Administration
Japan Society for the Promotion of Science23370013

    Keywords

    • Acaryochloris marina
    • Dollo's Law
    • genetic accommodation
    • horizontal gene transfer
    • niche breadth
    • phenotypic plasticity
    • phycocyanin

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