Repeated horizontal gene transfer of GALactose metabolism genes violates Dollo’s law of irreversible loss
- Univ. of Wisconsin, Madison, WI (United States); NYU Langone Health, NY (United States); University of Wisconsin-Madison Laboratory of Genetics
- Univ. of Wisconsin, Madison, WI (United States)
- Vanderbilt Univ., Nashville, TN (United States); Zhejiang Univ., Hangzhou (China)
- Vanderbilt Univ., Nashville, TN (United States)
- Vanderbilt Univ., Nashville, TN (United States); South China Agricultural Univ., Guangzhou (China)
- U.S. Dept. of Agriculture, Peoria, IL (United States)
Dollo’s law posits that evolutionary losses are irreversible, thereby narrowing the potential paths of evolutionary change. While phenotypic reversals to ancestral states have been observed, little is known about their underlying genetic causes. The genomes of budding yeasts have been shaped by extensive reductive evolution, such as reduced genome sizes and the losses of metabolic capabilities. However, the extent and mechanisms of trait reacquisition after gene loss in yeasts have not been thoroughly studied. Here, through phylogenomic analyses, we reconstructed the evolutionary history of the yeast galactose utilization pathway and observed widespread and repeated losses of the ability to utilize galactose, which occurred concurrently with the losses of GALactose (GAL) utilization genes. Unexpectedly, we detected multiple galactose-utilizing lineages that were deeply embedded within clades that underwent ancient losses of galactose utilization. We show that at least two, and possibly three, lineages reacquired the GAL pathway via yeast-to-yeast horizontal gene transfer. Our results show how trait reacquisition can occur tens of millions of years after an initial loss via horizontal gene transfer from distant relatives. Furthermore, these findings demonstrate that the losses of complex traits and even whole pathways are not always evolutionary dead-ends, highlighting how reversals to ancestral states can occur.
- Research Organization:
- Great Lakes Bioenergy Research Center, Madison, WI (United States)
- Sponsoring Organization:
- National Science Foundation; USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- FC02-07ER64494; SC0018409
- OSTI ID:
- 1764714
- Journal Information:
- Genetics (Online), Journal Name: Genetics (Online) Journal Issue: 2 Vol. 217; ISSN 1943-2631
- Publisher:
- Oxford University PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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