Extended evolutionary synthesis

The extended evolutionary synthesis consists of a set of theoretical concepts more comprehensive than the earlier modern synthesis of evolutionary biology that took place between 1918 and 1942. The extended evolutionary synthesis was called for in the 1950s by C. H. Waddington, argued for on the basis of punctuated equilibrium by Stephen Jay Gould and Niles Eldredge in the 1980s, and was reconceptualized in 2007 by Massimo Pigliucci and Gerd B. Müller.

The extended evolutionary synthesis revisits the relative importance of different factors at play, examining several assumptions of the earlier synthesis, and augmenting it with additional causative factors.[1][2] It includes multilevel selection, transgenerational epigenetic inheritance, niche construction, evolvability, and several concepts from evo-devo.[3][4][5][6]

Not all biologists have agreed on the need for, or the scope of, an extended synthesis. Many have collaborated on another synthesis in evolutionary developmental biology, which concetrates on developmental molecular genetics and evolution to understand how natural selection operated on developmental processes and deep homologies between organisms at the level of highly conserved genes.

The preceding "modern synthesis"

Several major ideas about evolution came together in the population genetics of the early 20th century to form the modern synthesis, including genetic variation, natural selection, and particulate (Mendelian) inheritance. This ended the eclipse of Darwinism and supplanted a variety of non-Darwinian theories of evolution. However, it did not unify all of biology, omitting sciences such as developmental biology.

The modern synthesis was the widely accepted early-20th-century synthesis reconciling Charles Darwin's theory of evolution by natural selection and Gregor Mendel's theory of genetics in a joint mathematical framework. It established evolution as biology's central paradigm. The 19th-century ideas of natural selection by Darwin and Mendelian genetics were united by researchers who included Ronald Fisher, one of the three founders of population genetics, and J. B. S. Haldane and Sewall Wright, between 1918 and 1932.[7][8][9][10] Julian Huxley introduced the phrase "modern synthesis" in his 1942 book, Evolution: The Modern Synthesis.[11][12][13]

Early history

During the 1950s, the English biologist C. H. Waddington called for an extended synthesis based on his research on epigenetics and genetic assimilation.[14][15][16] An extended synthesis was also proposed by the Austrian zoologist Rupert Riedl, with the study of evolvability.[17] In 1978, Michael J. D. White wrote about an extension of the modern synthesis based on new research from speciation.[18]

1980s: punctuated equilibrium

In the 1980s, the American palaeontologists Stephen Jay Gould and Niles Eldredge argued for an extended synthesis based on their idea of punctuated equilibrium, the role of species selection shaping large scale evolutionary patterns and natural selection working on multiple levels extending from genes to species.[19][20][21][22] The ethologist John Endler wrote a paper in 1988 discussing processes of evolution that he felt had been neglected.[23]

Contributions from evolutionary developmental biology

Some researchers in the field of evolutionary developmental biology proposed another synthesis. They argue that the modern and extended syntheses should mostly center on genes and suggest an integration of embryology with molecular genetics an evolution, aiming to understand how natural selection operates on gene regulation and deep homologies between organisms at the level of highly conserved genes, transcription factors and signalling pathways.[24][5] By contrast, a different strand of evo-devo following an organismal approach[25][26][27][28][29][30] contributes to the extended synthesis by emphasizing (amongst others) developmental bias[31] (both through facilitation[32] and constraint[33]), evolvability,[34][35] and inherency of form [36][37] as primary factors in the evolution of complex structures and phenotypic novelties.[38][39]

Recent history

Massimo Pigliucci, a leading proponent of the extended evolutionary synthesis in its 2007 form

The idea of an extended synthesis was relaunched in 2007 by Massimo Pigliucci,[40][41][42] and Gerd B. Müller[28][42] with a book in 2010 titled Evolution: The Extended Synthesis, which has served as a launching point for work on the extended synthesis.[42] This includes:

Other processes such as evolvability, phenotypic plasticity, reticulate evolution, sex evolution[50] and symbiogenesis are said by proponents to have been excluded or missed from the modern synthesis.[51][52] The goal of Piglucci's and Müller's extended synthesis is to take evolution beyond the gene-centered approach of population genetics to consider more organism- and ecology-centered approaches. Many of these causes are currently considered secondary in evolutionary causation, and proponents of the extended synthesis want them to be considered first-class evolutionary causes.[53] The biologist Eugene Koonin wrote in 2009 that "the new developments in evolutionary biology by no account should be viewed as refutation of Darwin. On the contrary, they are widening the trails that Darwin blazed 150 years ago and reveal the extraordinary fertility of his thinking."[54]

Predictions

The extended synthesis is characterized by its additional set of predictions that differ from the standard modern synthesis theory:

  1. change in phenotype can precede change in genotype[4]
  2. changes in phenotype are predominantly positive, rather than neutral (see: neutral theory of molecular evolution)
  3. changes in phenotype are induced in many organisms, rather than one organism[4]
  4. revolutionary change in phenotype can occur through mutation, facilitated variation[4] or threshold events[39][55]
  5. repeated evolution in isolated populations can be by convergent evolution or developmental bias[4][31]
  6. adaptation can be caused by natural selection, environmental induction, non-genetic inheritance, learning and cultural transmission (see: Baldwin effect, meme, transgenerational epigenetic inheritance, ecological inheritance, non-Mendelian inheritance)[4]
  7. rapid evolution can result from simultaneous induction, natural selection[4] and developmental dynamics[56]
  8. biodiversity can be affected by features of developmental systems such as differences in evolvability[4]
  9. heritable variation is directed towards variants that are adaptive and integrated with phenotype[4]
  10. niche construction is biased towards environmental changes that suit the constructor's phenotype, or that of its descendants, and enhance their fitness[57]
  11. kin selection[3]
  12. multilevel selection[4]
  13. self-organization[40][58]

Testing

The extended evolutionary synthesis is currently being tested by a group of scientists from eight institutions in Britain, Sweden and the United States. The £7.7 million project is supported by a £5.7 million grant from the John Templeton Foundation.[59][60]

The project is headed by Kevin N. Laland at the University of St Andrews and Tobias Uller at Lund University. According to Laland what the extended synthesis "really boils down to is recognition that, in addition to selection, drift, mutation and other established evolutionary processes, other factors, particularly developmental influences, shape the evolutionary process in important ways."[61]

Status

Biologists disagree on the need for an extended synthesis. Opponents contend that the modern synthesis is able to fully account for the newer observations, whereas others criticize that the Extended synthesis is not radical enough.[62] Proponents think that the conceptions of evolution at the core of the modern synthesis are too narrow.[63] Proponents argue that even when the modern synthesis allows for the ideas in the extended synthesis, using the modern synthesis affects the way that biologists think about evolution. For example, Denis Noble says that using terms and categories of the modern synthesis distort the picture of biology that modern experimentation has discovered.[64] Proponents therefore claim that the extended synthesis is necessary to help expand the conceptions and framework of how evolution is considered throughout the biological disciplines.[2][65]

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Further reading

Defend the extended synthesis

  • Arnold, Anthony J; Fristrup, Kurt (1982). "The Theory of Evolution by Natural Selection: A Hierarchical Expansion". Paleobiology. 8 (2): 113–129. doi:10.1017/s0094837300004462.
  • Boto, Luis (2010). "Horizontal Gene Transfer in Evolution: Facts and Challenges". Proc Biol Sci. 277: 819–827. doi:10.1098/rspb.2009.1679. PMC 2842723. PMID 19864285.
  • Carroll, Sean B (2008). "Evo-Devo and an Expanding Evolutionary Synthesis: A Genetic Theory of Morphological Evolution". Cell. 134: 25–36. doi:10.1016/j.cell.2008.06.030. PMID 18614008.
  • Endler, John (1986). "The Newer Synthesis? Some Conceptual Problems in Evolutionary Biology". Oxford Surveys in Evolutionary Biology. 3: 224–243.
  • Gilbert, Scott F. (2000). "A New Evolutionary Synthesis". In Developmental Biology, 6th edition. Sinauer. ISBN 0-87893-243-7
  • Jablonka, Eva; Lamb, Marion J (2008). "Soft Inheritance: Challenging the Modern Synthesis". Genetics and Molecular Biology. 31: 389–395. doi:10.1590/s1415-47572008000300001.
  • Koonin, Eugene (2009). "Towards a postmodern synthesis of evolutionary biology". Cell Cycle. 8: 799–800. doi:10.4161/cc.8.6.8187. PMC 3410441. PMID 19242109.
  • Koonin, Eugene (2009). "The Origin at 150: is a new evolutionary synthesis in sight?". Trends Genet. 25: 473–475. doi:10.1016/j.tig.2009.09.007. PMC 2784144. PMID 19836100.
  • Lodé, Thierry (2013). Manifeste pour une écologie évolutive, Darwin et après. Eds Odile Jacob, Paris.
  • Müller, Gerd B (2014). "EvoDevo Shapes the Extended Synthesis". Biol Theory. 9: 119–121. doi:10.1007/s13752-014-0179-6.
  • Pennisi, Elizabeth (2008). "Modernizing the Modern Synthesis". Science. 321: 196–197. doi:10.1126/science.321.5886.196.
  • Postdarwinism: "The New Synthesis". A review of Ecological Developmental Biology: Integrating Epigenetics, Medicine, and Evolution, by Scott F. Gilbert and David Epel (Sinauer, 2009).
  • "Post-modern synthesis?" A review of Developmental Plasticity and Evolution by Mary Jane West-Eberhard (Oxford University Press, 2003).
  • Schrey; et al. (2012). "The Role of Epigenetics in Evolution: The Extended Synthesis". Genetics Research International. 2012: 286164.
  • Weber, Bruce H (2011). "Extending and Expanding the Darwinian Synthesis: The Role of Complex Systems Dynamics". Studies in History and Philosophy of Biological and Biomedical Science. 42: 75–81. doi:10.1016/j.shpsc.2010.11.014.
  • Whitfield, John (2008). "Biology theory: Postmodern evolution?". Nature. 455: 281–284. doi:10.1038/455281a.

Criticism of the extended synthesis

  • Coyne, Jerry (November 24, 2014). "Does evolution need a revolution?". Why Evolution Is True (Blog). Retrieved 2015-11-19.
  • Craig, Lindsay (2010). "The So-Called Extended Synthesis and Population Genetics". Biological Theory. 5: 117–123. doi:10.1162/biot_a_00035.
  • Dickens, Thomas; Rahman, Qazi. (2012). "The extended evolutionary synthesis and the role of soft inheritance in evolution". Proceedings of the Royal Society: B biological sciences, 279 (1740). pp. 2913–2921.
  • Felsenstein, Joseph (1986). "Waiting for Post-Neo-Darwin". Evolution. 40 (4): 883–889. doi:10.2307/2408480.
  • Haig, David (2007). "Weismann rules! OK? Epigenetics and the Lamarckian Temptation". Biology and Philosophy. 22: 415–428. doi:10.1007/s10539-006-9033-y.
  • Kurland, CG; Canback, B; Berg, OG (2003). "Horizontal Gene Transfer: A Critical View". Proc Natl Acad Sci U S A. 100: 9658–9662. Bibcode:2003PNAS..100.9658K. doi:10.1073/pnas.1632870100. PMC 187805. PMID 12902542.
  • Lynch, Michael (2007). "The frailty of adaptive hypotheses for the origins of organismal complexity". Proceedings of the National Academy of Sciences. 104: 8597–8604. Bibcode:2007PNAS..104.8597L. doi:10.1073/pnas.0702207104. PMC 1876435. PMID 17494740.
  • Mayr, Ernst (2004). "80 years of watching the evolutionary scenery". Science. 305: 46–47. doi:10.1126/science.1100561.
  • Merlin, Francesca (2010). "Evolutionary Chance Mutation: A Defense of the Modern Synthesis' Consensus View". Philosophy & Theory in Biology. 2: 22. doi:10.3998/ptb.6959004.0002.003.
  • Stebbins, Ledyard G; Ayala, Francisco J (1981). "Is a New Evolutionary Synthesis Necessary?". Science. 213 (4511): 967–971. Bibcode:1981Sci...213..967L. doi:10.1126/science.213.4511.967.
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