The Nearshore Cradle of Early Vertebrate Diversification

Sallan, Lauren; Friedman, Matt; Sansom, Robert S.; Bird, Charlotte; Sansom, Ivan J.

doi:10.1130/abs/2018am-323310

Cited by 23 publications

(32 citation statements)

References 31 publications

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“…Placopecten magellanicus (scallop) and Drosophila the sequence identity within the myosin rod 506 is as high as 75%. Vertebrates appeared some 480 -360 million years ago by some estimates 507 (Sallan et al, 2018) yet vertebrate thick filaments from different species are highly similar in 508 structure at least to the extent that comparative studies have been done. For example, they have 509 similar length, same rotational symmetry, have titin to determine their length, and an axial repeat 510 of 429 Å (3 x 143 Å).…”

Section: Conclusion 484mentioning

confidence: 99%

CryoEM Structure ofDrosophilaFlight Muscle Thick Filaments at 7Å Resolution

Daneshparvar

Taylor

O’Leary

et al. 2020

Preprint

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19Striated muscle thick filaments are composed of myosin II and several non-myosin proteins. 20Myosin II's long α-helical coiled-coil tail forms the dense protein backbone of filaments while 21 its N-terminal globular head containing the catalytic and actin binding activities extends outward 22 from the backbone. Here we report the structure of thick filaments of the flight muscle of the 23 fruit fly Drosophila melanogaster at 7 Å resolution. Its myosin tails are arranged in curved 24 molecular crystalline layers identical to flight muscles of the giant waterbug Lethocerus indicus. 25Four non-myosin densities are observed, three of which correspond to ones found in Lethocerus; 26 one new density, possibly stretchin-Mlck, is found on the backbone outer surface. Surprisingly, 27the myosin heads are disordered rather than ordered along the filament backbone. Our results 28show striking myosin tail similarity within flight muscle filaments of two insect orders separated 29 by several hundred million years of evolution. 30 31 Significance Statement 32 Myosin thick filaments are one of striated muscle's key structures, but also one of its least 33 understood. A key question is how the myosin a-helical coiled-coil tail is arranged in the 34 backbone. At 7Å resolution, sufficient to resolve individual a-helices, the myosin tail arrangement 35 in thick filaments from the flight muscle of the fruit fly Drosophila melanogaster is strikingly 36 similar to the myosin tail arrangement in flight muscles of the giant waterbug Lethocerus indicus. 37 -2 -Nearly every other thick filament feature is different. Drosophila and Lethocerus evolved 38 separately >245 million years ago suggesting myosin tail packing into curved molecular crystalline 39 layers forms a highly conserved thick filament building block and different properties are obtained 40 by alterations in non-myosin proteins. 41 42 43 -3 -Introduction:

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Section: Conclusion 484mentioning

confidence: 99%

CryoEM Structure ofDrosophilaFlight Muscle Thick Filaments at 7Å Resolution

Daneshparvar

Taylor

O’Leary

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…At the same time, unexplained regularities in the origin of higher taxa, for example preferentially in nearshore habitats and in the tropics for marine invertebrate orders (Jablonski, 2005b(Jablonski, , 2010P. R. Martin, Bonier, & Tewksbury, 2007) and early vertebrate clades (Sallan, Friedman, Sansom, Bird, & Sansom, 2018, who unfortunately exaggerate differences with the invertebrate patterns), have yet to be convincingly linked to ecological or geographic patterns in either developmental or selective factors.…”

Section: Morphospaces Empirical and Theoreticalmentioning

confidence: 99%

Developmental bias, macroevolution, and the fossil record

Jablonski

2019

Evolution and Development

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A fuller understanding of the role of developmental bias in shaping large-scale evolutionary patterns requires integrating bias (the probability distribution of variation accessible to an ancestral phenotype) with clade dynamics (the differential survival and production of species and evolutionary lineages). This synthesis could proceed as a two-way exchange between the developmental data available to neontologists and the strictly phenotypic but richly historical and dynamic data available to paleontologists. Analyses starting in extant populations could aim to predict macroevolution in the fossil record from observed developmental bias, while analyses starting in the fossil record, particularly the record of extant species and lineages, could aim to predict developmental bias from macroevolutionary patterns, including the broad range of extinct phenotypes. Analyses in multivariate morphospaces are especially effective when coupled with phylogeny, theoretical and developmental models, and diversity-disparity plots. This research program will also require assessing the "heritability" of an ancestral bias across phylogeny, and the tendency for bias change in strength and orientation over evolutionary time. Such analyses will help find a set of general rules for the macroevolutionary effects of developmental bias, including its impact on and interactions with the other intrinsic and extrinsic factors governing the movement, expansion, and contraction of clades in morphospace.

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“…Speed and Arbuckle (2017) provide a review of other recent approaches to quantifying convergence using phylogeny. f) Relative rates of morphological evolution and ancestral character states can be estimated using the threshold model (Revell 2014, applied to paleontological data in Sallan et al 2018).…”

Section: Other New Approachesmentioning

confidence: 99%

Phylogenetic Comparative Methods: A User’s Guide for Paleontologists

Soul¹,

Wright²

2020

Preprint

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Recent advances in statistical approaches called Phylogenetic Comparative Methods (PCMs) have provided paleontologists with a powerful set of analytical tools for investigating evolutionary tempo and mode in fossil lineages. However, attempts to integrate PCMs with fossil data often present workers with practical challenges or unfamiliar literature. In this paper, we present guides to the theory behind, and application of, PCMs with fossil taxa. Based on an empirical dataset of Paleozoic crinoids, we present example analyses to illustrate common applications of PCMs to fossil data, including investigating patterns of correlated trait evolution, and macroevolutionary models of morphological change. We emphasize the importance of accounting for sources of uncertainty, and discuss how to evaluate model fit and adequacy. Finally, we discuss several promising methods for modelling heterogenous evolutionary dynamics with fossil phylogenies. Integrating phylogeny-based approaches with the fossil record provides a rigorous, quantitative perspective to understanding key patterns in the history of life.

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The Nearshore Cradle of Early Vertebrate Diversification

Cited by 23 publications

References 31 publications

CryoEM Structure ofDrosophilaFlight Muscle Thick Filaments at 7Å Resolution

CryoEM Structure ofDrosophilaFlight Muscle Thick Filaments at 7Å Resolution

Developmental bias, macroevolution, and the fossil record

Phylogenetic Comparative Methods: A User’s Guide for Paleontologists

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