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Formation and diversification of a paradigm biosynthetic gene cluster in plants
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Formation and diversification of a paradigm biosynthetic gene cluster in plants
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Formation and diversification of a paradigm biosynthetic gene cluster in plants
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Journal Article
Formation and diversification of a paradigm biosynthetic gene cluster in plants
2020
Overview
Numerous examples of biosynthetic gene clusters (BGCs), including for compounds of agricultural and medicinal importance, have now been discovered in plant genomes. However, little is known about how these complex traits are assembled and diversified. Here, we examine a large number of variants within and between species for a paradigm BGC (the thalianol cluster), which has evolved recently in a common ancestor of the
Arabidopsis
genus. Comparisons at the species level reveal differences in BGC organization and involvement of auxiliary genes, resulting in production of species-specific triterpenes. Within species, the thalianol cluster is primarily fixed, showing a low frequency of deleterious haplotypes. We further identify chromosomal inversion as a molecular mechanism that may shuffle more distant genes into the cluster, so enabling cluster compaction. Antagonistic natural selection pressures are likely involved in shaping the occurrence and maintenance of this BGC. Our work sheds light on the birth, life and death of complex genetic and metabolic traits in plants.
How plant biosynthetic gene clusters (BGCs) form and evolve remains unclear. Here, via examining available genomes within and between
Arabidopsis
species, the authors show that the thalianol BGC has evolved recently and is still dynamically evolving through involvement of auxiliary genes and chromosomal inversions.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
