Encyclopedia/1. The Cosmos & The Natural World/5. Life Sciences • Curated by Admin Timeline.sg
Evo-devo (evolutionary developmental biology) and epigenetic gene regulation explore how genetic and epigenetic changes drive morphological evolution and development. This timeline highlights key discoveries from ancient observations to modern molecular insights, including the Spemann-Mangold organizer, Hox genes, and epigenetic inheritance mechanisms.
Chronological Storyline (49 Milestones)
350 BCE
Aristotle's Observations on Embryology
Aristotle describes embryonic development in animals, proposing epigenesis (gradual formation) vs. preformation. #evo-devo #history
Aristotle's Observations on Embryology By SUBnormali Team Original uploader was Yoruno at it.wikipedia - Transferred from it.wikipedia (Original text : subnormali-team.blogspot.com), CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=6381781
1651 CE
Harvey's 'Exercitationes de Generatione Animalium'
William Harvey publishes work on animal generation, supporting epigenesis. #evo-devo #history
Harvey's 'Exercitationes de Generatione Animalium' By After Daniël Mijtens - National Portrait Gallery: NPG 5115, Public domain, https://commons.wikimedia.org/w/index.php?curid=5975113
1759 CE
Wolff's 'Theoria Generationis'
Caspar Friedrich Wolff provides evidence for epigenesis, describing plant and animal development. #evo-devo #history
Wolff's 'Theoria Generationis' By F. Anting Liftarn - Based on Image:Caspar Friedrich Wolff.jpg, Public domain, https://commons.wikimedia.org/w/index.php?curid=1115580
1828 CE
von Baer's Laws of Embryology
Karl Ernst von Baer formulates laws of embryonic development, noting that general features appear before specialized ones. #evo-devo #embryology
von Baer's Laws of Embryology By Unknown author - National Library of Norway, Public domain, https://commons.wikimedia.org/w/index.php?curid=34041566
1866 CE
Haeckel's Biogenetic Law
Ernst Haeckel proposes 'ontogeny recapitulates phylogeny', influencing early evo-devo. #evo-devo #history
Haeckel's Biogenetic Law By Unknown author - http://ihm.nlm.nih.gov/images/B13670, Public domain, https://commons.wikimedia.org/w/index.php?curid=18637707
1891 CE
Weismann's Germ Plasm Theory
August Weismann proposes that hereditary information is transmitted only through germ cells, not somatic cells. #epigenetics #history
Weismann's Germ Plasm Theory By Unknown author - Edwin G. Conklin, "August Weismann" Proceedings of the American Philosophical Society, Vol. 54, No. 220. (Oct. - Dec., 1915), pp. iii-xii., Public domain, https://commons.wikimedia.org/w/index.php?curid=577853
1902 CE
Bateson Coins 'Genetics'
William Bateson introduces the term 'genetics' and studies homeotic mutations in flowers. #evo-devo #genetics
Bateson Coins 'Genetics' By Unknown author - https://web.archive.org/web/20051027192232/http://www.amphilsoc.org/library/images/genetics/bateson2.jpg, Public domain, https://commons.wikimedia.org/w/index.php?curid=671689
1915 CE
Morgan's Work on Drosophila
Thomas Hunt Morgan establishes Drosophila as a model organism, discovering sex-linked inheritance and mutations. #evo-devo #genetics
Morgan's Work on Drosophila By Unknown author - http://resource.nlm.nih.gov/101422222, Public domain, https://commons.wikimedia.org/w/index.php?curid=549067
1924 CE
Spemann-Mangold Organizer Experiment
Hans Spemann and Hilde Mangold demonstrate the organizer region in amphibian embryos, inducing neural tissue. #evo-devo #embryology
1935 CE
Spemann Wins Nobel Prize
Hans Spemann receives the Nobel Prize for his organizer discovery, foundational for developmental biology. #evo-devo #nobel
Spemann Wins Nobel Prize By Unknown author - http://www.nobelprize.org/nobel_prizes/medicine/laureates/1935, Public domain, https://commons.wikimedia.org/w/index.php?curid=18336155
1940 CE
Waddington's Epigenetic Landscape
Conrad Hal Waddington introduces the epigenetic landscape metaphor, linking genetics and development. #evo-devo #epigenetics
1953 CE
Watson and Crick DNA Structure
Discovery of DNA double helix, enabling molecular understanding of gene regulation. #genetics #epigenetics
Watson and Crick DNA Structure By Zephyris - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=15027555
1961 CE
Jacob and Monod Operon Model
François Jacob and Jacques Monod propose the lac operon model for gene regulation in bacteria. #gene_regulation #epigenetics
Jacob and Monod Operon Model By T A RAJU - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=19490479
1969 CE
King and Wilson's Molecular Evolution Paper
Mary-Claire King and Allan Wilson propose that regulatory changes drive evolution between humans and chimpanzees. #evo-devo #evolution
King and Wilson's Molecular Evolution Paper By Uwe Dettmar/Paul-Ehrlich-Stiftung - Mary-Claire King, Goethe University Frankfurt (IMAGE), Copyrighted free use, https://commons.wikimedia.org/w/index.php?curid=37848244
1975 CE
Holliday's Epigenetic Inheritance Model
Robin Holliday proposes mechanisms for epigenetic inheritance, including DNA methylation patterns. #epigenetics #history
1978 CE
Lewis' Bithorax Complex in Drosophila
Edward B. Lewis describes the bithorax complex, a set of homeotic genes controlling segment identity. #evo-devo #genetics
1980 CE
Nüsslein-Volhard and Wieschaus Screen for Embryonic Patterning Genes
Christiane Nüsslein-Volhard and Eric Wieschaus identify key genes for Drosophila body plan, including gap and pair-rule genes. #evo-devo #nobel
Nüsslein-Volhard and Wieschaus Screen for Embryonic Patterning Genes By Rama - Own work, CC BY-SA 2.0 fr, https://commons.wikimedia.org/w/index.php?curid=2270623
1983 CE
Hox Gene Discovery in Drosophila
Homeobox (Hox) genes discovered in Drosophila, revealing conserved master regulators of body patterning. #evo-devo #genetics
1984 CE
Hox Genes Found in Vertebrates
Homologs of Drosophila Hox genes discovered in vertebrates, showing deep evolutionary conservation. #evo-devo #evolution
1985 CE
DNA Methylation Implicated in Gene Silencing
Studies link DNA methylation to transcriptional repression, a key epigenetic mechanism. #epigenetics #gene_regulation
DNA Methylation Implicated in Gene Silencing By Mariuswalter - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=54317915
1990 CE
Hox Gene Clusters and Colinearity
Discovery that Hox gene order along chromosome correlates with expression domains along the body axis. #evo-devo #genetics
1991 CE
Genomic Imprinting Discovered in Mammals
Parent-of-origin effects on gene expression (imprinting) shown for Igf2 and other genes. #epigenetics #genetics
1993 CE
First microRNA (lin-4) Discovered in C. elegans
Victor Ambros and colleagues discover lin-4, a small non-coding RNA regulating developmental timing. #epigenetics #gene_regulation
1995 CE
Nobel Prize for Developmental Genetics
Nüsslein-Volhard, Wieschaus, and Lewis awarded Nobel for discoveries of genetic control of embryonic development. #evo-devo #nobel
1996 CE
Dolly the Sheep Cloned
First mammal cloned from an adult somatic cell, demonstrating epigenetic reprogramming. #epigenetics #cloning )
1998 CE
RNA Interference Discovered in C. elegans
Andrew Fire and Craig Mello discover RNAi, a gene silencing mechanism with epigenetic implications. #epigenetics #gene_regulation
RNA Interference Discovered in C. elegans By Dan Cojocari ✉·✍· - Own, This W3C-unspecified vector image was created with Adobe Illustrator., CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=8697221
Drosophila Genome Sequenced By Sanjay Acharya - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=63862733
2002 CE
Histone Code Hypothesis Proposed
David Allis and colleagues propose that histone modifications form a code regulating chromatin structure and gene expression. #epigenetics #gene_regulation
2003 CE
Human Genome Project Completed
Completion of human genome sequence, enabling studies of regulatory elements and non-coding DNA. #genomics #evo-devo
Human Genome Project Completed By U.S. Department of Energy, Human Genome Project - http://www.ornl.gov/hgmis, Public domain, https://commons.wikimedia.org/w/index.php?curid=2485616
2004 CE
ENCODE Project Launched
Encyclopedia of DNA Elements (ENCODE) aims to identify functional elements, including regulatory regions. #epigenetics #genomics
2005 CE
First Epigenome Map of Human Cells
Methylation patterns mapped across human chromosomes, revealing epigenetic landscapes. #epigenetics #genomics
First Epigenome Map of Human Cells By Ahmed.yosri - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=70491004
Shinya Yamanaka reprograms mouse fibroblasts into pluripotent stem cells using four transcription factors. #evo-devo #stemcells
Yamanaka Discovers Induced Pluripotent Stem Cells (iPSCs) By NIH Image Gallery from Bethesda, Maryland, USA - Human induced pluripotent stem cell colony, Public domain, https://commons.wikimedia.org/w/index.php?curid=114900547
2007 CE
Human iPSCs Generated
Yamanaka and colleagues generate human iPSCs, revolutionizing developmental biology and medicine. #evo-devo #stemcells
2008 CE
Epigenetic Transgenerational Inheritance in Plants
Studies show that DNA methylation patterns can be inherited across generations in Arabidopsis. #epigenetics #inheritance
Epigenetic Transgenerational Inheritance in Plants By Tobus - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=129728760
2009 CE
Cis-Regulatory Evolution and Stickleback Pelvis
David Kingsley's lab shows that regulatory changes in Pitx1 gene underlie pelvic reduction in sticklebacks. #evo-devo #evolution
Cis-Regulatory Evolution and Stickleback Pelvis By Emw - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=8820898
2010 CE
Neanderthal Genome Sequenced
First draft of Neanderthal genome published, revealing gene flow with modern humans and regulatory differences. #evo-devo #genomics
2011 CE
CRISPR-Cas9 Genome Editing Developed
Jennifer Doudna and Emmanuelle Charpentier repurpose CRISPR-Cas9 for precise genome editing, enabling functional studies. #evo-devo #genetics
CRISPR-Cas9 Genome Editing Developed By Deposition authors: Nishimasu, H., Ishitani, R., Nureki, O.; Visualization author: Synpath - Atom coordinates: https://www.rcsb.org/structure/4OO8; Visualization: Own work, CC0, https://commons.wikimedia.org/w/index.php?curid=133423568
2012 CE
Enhancer Evolution and Human Brain Expansion
Studies identify human-specific enhancers (HARs) that may drive brain size increase. #evo-devo #evolution
Enhancer Evolution and Human Brain Expansion By Pollard KS, Salama SR, King B, Kern AD, Dreszer T, et al. - Forces Shaping the Fastest Evolving Regions in the Human Genome, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=7370443
2013 CE
Epigenetic Clock Developed
Steve Horvath develops DNA methylation-based age predictor, linking epigenetics to aging. #epigenetics #aging
Epigenetic Clock Developed By Mariuswalter - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=54318073
Fusion of dCas9 with epigenetic modifiers enables targeted DNA methylation and histone modification. #epigenetics #gene_regulation
Epigenome Editing with CRISPR-dCas9 By Kazi1111 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31204172
2016 CE
Organoids Model Human Development
3D organoids derived from stem cells recapitulate aspects of organ development, aiding evo-devo studies. #evo-devo #stemcells
Organoids Model Human Development By Meritxell Huch - https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1002149, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=40325751
2017 CE
Ancient DNA Reveals Denisovan Epigenetics
Methylation patterns reconstructed from ancient DNA, providing insights into extinct hominin development. #epigenetics #evolution
Ancient DNA Reveals Denisovan Epigenetics By Svante Pääbo, Max Planck Institute for Evolutionary Anthropology - Nicholls H: Ancient DNA Comes of Age. PLoS Biol 3/2/2005: e56. doi:10.1371/journal.pbio.0030056, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=1378661
2018 CE
First Complete Fly Brain Connectome
Complete wiring diagram of Drosophila larval brain published, linking neural development to behavior. #evo-devo #neuroscience
First Complete Fly Brain Connectome By Xavier Gigandet et. al. - Gigandet X, Hagmann P, Kurant M, Cammoun L, Meuli R, et al. (2008) Estimating the Confidence Level of White Matter Connections Obtained with MRI Tractography. PLoS ONE 3(12): e4006. doi:10.1371/journal.pone.0004006, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=8134159
2019 CE
Human Gastruloid Models
Stem cell-derived gastruloids mimic early human embryonic development, enabling study of body axis formation. #evo-devo #stemcells
Human Gastruloid Models By Susanne C. van den Brink, Peter Baillie-Johnson, Tina Balayo, Anna-Katerina Hadjantonakis, Sonja Nowotschin, David A. Turner, Alfonso Martinez Arias - (2014). "Symmetry breaking, germ layer specification and axial organisation in aggregates of mouse embryonic stem cells". Development 141 (22): 4231–4242. DOI:10.1242/dev.113001., CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=46662580
2020 CE
Epigenetic Therapy Approved for Cancer
FDA approves combination of hypomethylating agents and histone deacetylase inhibitors for certain leukemias. #epigenetics #medicine
Epigenetic Therapy Approved for Cancer By Maryam Rafiee Baharloo - Own work; Figure.pdf, CC0, https://commons.wikimedia.org/w/index.php?curid=154815140
2021 CE
Synthetic Embryo Models from Stem Cells
Mouse stem cells self-organize into embryo-like structures (embryoids) without fertilization. #evo-devo #stemcells
2022 CE
Complete Human Epigenome Reference
Epigenome Roadmap Consortium publishes comprehensive maps of DNA methylation and histone marks across cell types. #epigenetics #genomics
2023 CE
AI Predicts Gene Regulatory Networks
Deep learning models accurately predict enhancer-promoter interactions and developmental gene expression. #evo-devo #AI
AI Predicts Gene Regulatory Networks By Sven Behnke - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=82466022
