Is there a loophole in Dollo's law? A DevoEvo perspective on irreversibility (of felid dentition)

There is a longstanding interest in whether the loss of complex characters is reversible (so‐called “Dollo's law”). Reevolution has been suggested for numerous traits but among the first was Kurtén, who proposed that the presence of the second lower molar (M2) of the Eurasian lynx (Lynx lynx) w...

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Veröffentlicht in:Journal of experimental zoology. Part B, Molecular and developmental evolution Molecular and developmental evolution, 2023-12, Vol.340 (8), p.509-517
1. Verfasser: Lynch, Vincent J.
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description There is a longstanding interest in whether the loss of complex characters is reversible (so‐called “Dollo's law”). Reevolution has been suggested for numerous traits but among the first was Kurtén, who proposed that the presence of the second lower molar (M2) of the Eurasian lynx (Lynx lynx) was a violation of Dollo's law because all other Felids lack M2. While an early and often cited example for the reevolution of a complex trait, Kurtén and Werdelin used an ad hoc parsimony argument to support their. Here I revisit the evidence that M2 reevolved lynx using explicit parsimony and maximum likelihood models of character evolution and find strong evidence that Kurtén and Werdelin were correct—M2 reevolved in E. lynx. Next, I explore the developmental mechanisms which may explain this violation of Dollo's law and suggest that the reevolution of lost complex traits may arise from the reevolution of cis‐regulatory elements and protein−protein interactions, which have a longer half‐life after silencing that protein coding genes. Finally, I present a developmental model to explain the reevolution M2 in E. lynx, which suggest that the developmental programs required for the establishment of serially homologous characters may never really be lost so long as a single instance of the character remains—thus the gain and loss and regain of serially homologous characters, such mammalian molars, may be developmentally and evolutionarily “simple.” DevoEvo loopholes to beat Dollo's Law. Research highlights There is a growing interest in and renewed debate over whether the loss of complex characters is reversible. Kurtén suggested that the second lower molar (M2) recently reevolved in the Eurasian lynx. A simple model suggest that shared developmental genetic programs make the gain and loss and regain of serially homologous characters, such mammalian molars, evolutionarily “simple.”
doi_str_mv 10.1002/jez.b.23163
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Next, I explore the developmental mechanisms which may explain this violation of Dollo's law and suggest that the reevolution of lost complex traits may arise from the reevolution of cis‐regulatory elements and protein−protein interactions, which have a longer half‐life after silencing that protein coding genes. Finally, I present a developmental model to explain the reevolution M2 in E. lynx, which suggest that the developmental programs required for the establishment of serially homologous characters may never really be lost so long as a single instance of the character remains—thus the gain and loss and regain of serially homologous characters, such mammalian molars, may be developmentally and evolutionarily “simple.” DevoEvo loopholes to beat Dollo's Law. Research highlights There is a growing interest in and renewed debate over whether the loss of complex characters is reversible. Kurtén suggested that the second lower molar (M2) recently reevolved in the Eurasian lynx. 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subjects Animals
Dentition
developmental programs
Dollo's law
EvoDevo
Lynx
Mammals
Phylogeny
reevolution
title Is there a loophole in Dollo's law? A DevoEvo perspective on irreversibility (of felid dentition)
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