Re-crowning mammals

Cifelli, Richard L.; Gordon, Cynthia L.

doi:10.1038/447918a

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…2). According to this reconstruction, the presence of SCAND3 and KRBA2 in almost all eutherian genomes (including the basal mammalian subgroups, afrotherians and xenarthans) and the detection of SCAND3 in at least the wallaby, suggest that SCAN/KRAB C-INTs (or at least SCAND3) might have originated prior to the eutherian-metatherian split (145–65 million years ago 30 , 31 ). Thus, SCAND3 and KRBA2 are restricted to therian mammals (eutherians and metatherians) and their respective phylogenies follow that expected for single copy genes vertically inherited from a therian ancestor.…”

Section: Resultsmentioning

confidence: 91%

On the transposon origins of mammalian SCAND3 and KRBA2, two zinc-finger genes carrying an integrase/transposase domain

Lloréns

Bernet²,

Ramasamy

et al. 2012

Mobile Genetic Elements

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SCAND3 and KRBA2 are two mammalian proteins originally described as “cellular-integrases” due to sharing of a similar DDE-type integrase domain whose origin and relationship with other recombinases remain unclear. Here we perform phylogenetic analyses of 341 integrase/transposase sequences to reveal that the integrase domain of SCAND3 and KRBA2 derives from the same clade of GINGER2, a superfamily of cut-and-paste transposons widely distributed in insects and other protostomes, but seemingly absent or extinct in vertebrates. Finally, we integrate the results of phylogenetic analyses to the taxonomic distribution of SCAND3 and KRBA2 and their transposon relatives to discuss some of the processes that promoted the emergence of these two chimeric genes during mammalian evolution.

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Section: Resultsmentioning

confidence: 91%

On the transposon origins of mammalian SCAND3 and KRBA2, two zinc-finger genes carrying an integrase/transposase domain

Lloréns

Bernet²,

Ramasamy

et al. 2012

Mobile Genetic Elements

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“…Incumbency or priority effects, where one clade excludes or hinders another owing not to competitive superiority but to historical contingency (colonization or origination sequence) (e.g., Case 1991; Almany 2003; Fukami 2004; Irving et al 2007; Louette and De Meester 2007), are held to underlie many macroevolutionary lags (e.g., Valentine 1980; Van Valen 1985; Rosenzweig and McCord 1991; Alroy 1996; Jablonski and Sepkoski 1996; Eldredge 1997, 2002; Jablonski 2000, 2001; Seilacher et al 2007). As already noted, the most famous example is the Mesozoic lag and early Cenozoic diversification of the mammals (Alroy 1999 and references therein; Bininda‐Emonds et al [2007] were taken to negate an evolutionary effect of dinosaur extinction on mammals, but their molecular analysis overemphasized crown groups, see Cifelli and Gordon 2007; Wible et al 2007). Other examples of evolutionary incumbency and its release arguably include other diversifications following major extinction events (Miller and Sepkoski 1988; Patzkowsky 1995; Foote 1997; McKinney 1998; Sepkoski 1998; Erwin 2001; Jablonski 2001) (Fig.…”

Section: Apparent Contradictions Across Scalesmentioning

confidence: 99%

Biotic Interactions and Macroevolution: Extensions and Mismatches Across Scales and Levels

2008

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Life-History Correlates of Placental Structure in Eutherian Evolution

Lewitus

Soligo

2011

Evol Biol

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The eutherian placenta shows remarkable evolutionary plasticity. To date, however, success in identifying selection pressures behind the observed diversity of placental structures has been limited. Evolutionary convergence among definitive placental morphologies and between placental morphologies and life-history variables can be used to suggest functions of derived aspects of placentation. In this paper, we use, for the first time, a comprehensive phylogenetic comparative approach to map phenotypic character states of both placental morphologies and life-history characteristics of species onto hypotheses of phylogenetic relationships in Eutheria. We employ phylogenetic methods for ancestral reconstruction, mutational mapping, and association analysis to resolve associations between five aspects of placental structure and to identify dominant combinations, or syndromes, of placental morphology. We map twenty life-history characters onto the eutherian phylogeny to examine how they correlate, over evolutionary time, with the multivariate diversification of placental structures. We identify two distinct eutherian constellations, based on associations between life-history and placental structure, which broadly reflect a dichotomy between slow and fast life-history strategies. In addition, we suggest that the observed association between placental invasiveness and group size is indicative of the effect of social behavior on the utility of genomicimprinting in eutherian evolution.

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Re-crowning mammals

Cited by 6 publications

References 10 publications

On the transposon origins of mammalian SCAND3 and KRBA2, two zinc-finger genes carrying an integrase/transposase domain

On the transposon origins of mammalian SCAND3 and KRBA2, two zinc-finger genes carrying an integrase/transposase domain

Biotic Interactions and Macroevolution: Extensions and Mismatches Across Scales and Levels

Life-History Correlates of Placental Structure in Eutherian Evolution

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