Developmental Biology enquires about the fundamental processes that underpin the fertilisation of an egg cell and its step-by-step transformation into the fascinating complexity of a whole organism (Box 1).
Box 1: Some definitions of Developmental Biology
- Developmental Biology is the study of the processes by which organs grow and develop. Modern developmental biology studies the genetic control of cell growth, differentiation and morphogenesis, which is the process that gives rise to tissues, organs and anatomy, but also regeneration and ageing (after L. Wolpert)
- Developmental biology is the study of the process by which animals and plants grow and develop, and is synonymous with ontogeny (Wikipedia).
- Developmental Biology is the causal analysis of the cellular mechanisms that drive processes of growth, pattern formation and morphogenesis (A. Martínez Arias)
At first sight, Developmental Biology could be viewed as an academic discipline driven by mere curiosity and, hence, to be of little relevance to the big challenges of population health or sustainability. On the contrary, Developmental Biology – shoulder-to-shoulder with Physiology – is arguably the most important biological discipline we have. Here we will explain this statement.
(1) Developmental defects in humans are very abundant (Box 2). By studying the underlying mechanisms and causes, Developmental Biology addresses the key challenge of population health. Sustaining food resources is another major global challenge, and Developmental Biology can provide key strategies to improving crop and plant cultivation (see Mathan et al., 2016, Development 143, 3283ff. — LINK; further arguments will follow).
Box 2: Statements from the literature illustrating the abundance of developmental defects in humans
- The frequency at which all classes of developmental defects occur is thought to be … exceeding half of initial pregnancies.
- Major developmental defects … occur in approximately 3% of live births.
- In 1995, major developmental defects accounted for approximately 70% of neonatal deaths (occurring before 1 month of age) and 22% of the 6,500 infant deaths (before 15 months of age) in the US.
- Approximately 30% of admissions to pediatric hospitals are for health problems associated with such defects.
source: Scientific Frontiers in Developmental Toxicology and Risk Assessment, 2000, National Academic Press, Washington DC, pp.354; edited by the National Research Council (LINK)
(2) Developmental Biology (like Physiology) is asking fundamental questions at the level of whole organisms, organs or tissues (Box 3). Notably, this is the level at which diseases become manifest. For this reason, Developmental Biology has been, and continues to be, most effective in delivering explanations for diseases or medically relevant processes including infertility, neonatal death, birth defects (e.g. deformation, body growth abnormalities, developmental brain disorders, blindness, deafness), cancer, wound healing, tissue regeneration (regenerative medicine including stem cell biology), etc.
Box 3: Fundamental questions asked by developmental biologists – and how they translate into biomedical application
- What processes lead to fertilisation and the initiation of development? How can we overcome infertility and childlessness?
- How do single fertilised egg cells, or later on groups of progenitor cells, generate the enormous cellular diversity of an organism and its organs and tissues? How do stem cells generate whole tissues or organs – for example in regeneration, wound healing or tissue engineering?
- How do cells, which originate from common ancestors and contain the same genetic information, adopt different fates? How do cells change their identities and behaviours – for example in cancer?
- How do tissues and their cells know when to stop growing? How can cells evade growth control – for example in tumour growth?
- How is the formation of different cells/tissues coordinated in space and time? What are the patho-mechanisms underlying birth disorders?
(3) By asking fundamental questions at the level of organisms, organs and tissues, Developmental Biology-related research is a generator of new ideas and concepts (Box 4). These concepts essentially underpin the modern biomedical sciences and include cell signalling, tissue and body patterning, growth regulation, cell migration or morphogenesis; they form the basis for contemporary research into stem cells, cancer, wound healing, regeneration or ageing.
(4) Developmental Biology is exciting and powerful because it reaches across the different levels of biological complexity and explanation; phenomena at the level of organisms, organs or tissues can ultimately be understood only by tracing them back to events at the level of genes and cells. Consequently, Developmental Biology embraces disciplines such as genetics, molecular biology, (stem) cell biology, biochemistry, biophysics as well as evolutionary biology.
(5) Developmental Biology capitalises on the principle of evolutionary conservation of genes, mechanisms and concepts. Thus, it makes use of suitable model organisms, down to experimentally and genetically amenable invertebrates, which provide an efficient and powerful strategy to generate new ideas, concepts and understanding – before validating these in higher organisms including their medical application in humans (LINK). This discovery pipeline has been a central driver for the enormous contributions that Developmental Biology has made and continues to make to the biomedical sciences.
Box 4: A metaphor explaining how Developmental Biology works
Understanding a combustion engine requires investigating its single parts, such as the sparking plug, cylinder or crank shaft. For a developmental biologist it is not sufficient to find out how each of these parts works, but this new knowledge needs to be linked into the function of the entire engine, thus validating the relevance of new findings and developing conceptual understanding of the mechanistic networks that explain how the engine works. Only with this systemic understanding can engine faults be successfully diagnosed and eventually repaired.
Box 5: A special issue on science communication in “Seminars in Cell & Developmental Biology”
Editors: Sam Illingworth and Andreas Prokop
The aim of this special issue is to provide concise and accessible advice on how to engage effectively, as well as share valuable practice gained from successful long-term science communication initiatives – thus providing ideas to all those who want to engage or are engaging already. This issue is written for scientists working in the field of the biomedical sciences (and beyond), but will hopefully also be seen as a helpful resource for academic science communicators.
- Expected soon: editorial
- Delivering effective science communication: advice from a professional science communicator – Sam Illingworth [LINK]
- Expected soon: impact and activity evaluation
- Expected soon: engaging about stem cells
- The Manchester Fly Facility: Implementing an objective-driven long-term science communication initiative – Sanjai Patel, Andreas Prokop [LINK]
- Building dialogues between clinical and biomedical research through cross-species collaborations – Hsiao-Tuan Chao, Lucy Liu, Hugo J. Bellen [LINK]
- Expected soon: engaging in Africa
- Engaging with primary schools: supporting the delivery of the new curriculum in evolution and inheritance – Paula Kover and Emily Hogge [in press]
- Expected soon: engaging with Drosophila in schools
- Science Communication at Scientific Societies – Jeanne Braha [LINK]
- The Node and beyond – using social media in cell and developmental biology – Catarina Vicente, Aidan Maartens, Katherine Brown [LINK]
 In the sense used here, Physiology comprises disciplines like immunology or functional studies in the field of neurobiology
 Arguments and examples given so far concern studies of animal development, and those for plant development will follow soon