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Behind the Genes

Behind the Genes

By: Genomics England
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At Genomics England, our vision is a world where everyone benefits from genomic healthcare.

From the latest research to the lived experiences of those affected by rare conditions and cancer, Behind the Genes brings you closer to the people behind the science.

Each month, we release a deep-dive episode, alongside our Genomics 101 series - short explainers designed to make complex terms in genetics and genomics easier to understand.

Copyright 2021 All rights reserved. Biological Sciences Science Social Sciences
Episodes
  • What is genomics?

    What is genomics?
    Jul 15 2026
    In this explainer episode, we’ve asked Ella Davyson, Genomics Data Scientist, to explain the meaning of the term genomics. You can also find a series of short videos explaining some of the common terms you might encounter about genomics on our YouTube channel. If you’ve got any questions, or have any other topics you’d like us to explain, let us know on podcast@genomicsengland.co.uk. You can download the transcript or read it below. [00:00:00] Florence: What is genomics? My name is Florence Cornish, and today I'm joined by Ella Davyson, who is a genomics data scientist here at Genomics England, and she is here to explain the topic in much more detail So, Ella, we obviously both work at Genomics England. This podcast is called Genomics 101, so I guess it's fitting that we have an episode dedicated to explaining the term 'genomics'. [00:00:26] But before we get into that, I think it would be good if you could first explain what we mean by the term 'genome'. [00:00:32] Ella: Thanks, Florence. The genome is, essentially you can think of it like a manual booklet, or instructions that the body uses in how to grow, survive, and function, and this is a manual that's in every single cell within our body, and it tells our cells exactly how to divide, how to survive. [00:00:54] For example, the genome in the pancreas, in pancreatic cells will tell those cells how to produce proteins such as insulin that we need to control our blood sugar. And also, the genome within our eye cells will tell the cells how to generate photoreceptors to enable us to see. So the genome is essentially like the ultimate guide that our body uses to tell it how to create everything that we need to survive going forwards. [00:01:25] Florence: So then, what do we mean by the term 'genomics'? [00:01:30] Ella: So, genomics is essentially the study of the entire human genome. So we study its structure and also how it functions, in terms of how is this instruction manual being read by the body, and how does that result in healthy human beings that we see today. [00:01:48] Florence: So when we're talking about studying DNA, lots of our listeners might have heard the term 'genetics', which kind of also refers to the study of DNA and genes, so it might be a little bit confusing. [00:01:58] So what's the difference between the two? What's the difference between genetics and genomics? [00:02:04] Ella: So genetics is specifically the study of genes in the genome, and genes are part of the instruction manual, that specifically tell the body to produce a certain thing. So, in our insulin example, there is an INS gene, so, which is the gene in the genome or the instruction manual that specifically tells the cells to make insulin and to produce this product. [00:02:30] There are many different genes in our genome, and genetics is the study of all of these. In contrast, genomics is the study of the entire instruction manual altogether, so that includes all of the genes in genetics and also everything else in the manual. So, genetics is limited to the study of these parts of the manual that clearly encode certain proteins or products such as insulin. Genomics is the study of everything all at once, everything under the bathroom sink. So yeah, the confusion I think can arise a lot because historically when we first started looking at DNA and researching genetics, we didn't have the technology to look at the whole genome all at once, and with older sequencing technologies we would focus on particular genes that we knew important for certain diseases. [00:03:19] So in diabetes, for example, they would instead specifically look at the insulin gene and see how does this influence diabetes, rather than looking at the entire instruction manual at once. Nowadays, we do have that technology, and that is what we do here at Genomics England, just use that to look at the entire genome rather than specific subsets of the genome, so specific genes. [00:03:45] We can look at everything in its entirety. So, you can kind of think of genomics as a much broader, more complete study of genetics. [00:03:56] Florence: So speaking of genomic testing, I don't know if you saw, but in the government's 10-year Health Plan that they published last year, they predicted that genomics could play a role in up to 50% of healthcare interactions. [00:04:08] Could you tell me a bit about why genomics is important in healthcare? [00:04:12] Ella: So that's a really exciting point, and I think one that we should be all striving towards. So, genomics can play a role in healthcare in so many different ways. I think before going into each of them, it's kind of maybe important just to illustrate that our genomes between two, two people are 99.9% the same. [00:04:38] So we're both humans. We are both the same species. There is 0.1% difference between two people's genomes, and those differences underlie all the uniqueness that makes a person a unique individual. [00:04:54] So personality, ...
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    10 mins
  • Could taking aspirin halve the risk of bowel cancer?

    Could taking aspirin halve the risk of bowel cancer?
    Jun 24 2026
    A daily low dose of aspirin could significantly reduce the risk of bowel cancer in people with Lynch syndrome, an inherited condition that increases the likelihood of developing certain cancers. In this episode, we explore the findings from the landmark CaPP3 trial, hear from a participant living with Lynch syndrome, and discuss how genomics could help shift healthcare from treatment to prevention. Our host, Sharon Jones is joined by: Dr Katie Snape, Principal Clinician for Population Health at Genomics England Professor Sir John Burn, Professor of Clinical Genetics at Newcastle University Drew Hyde, participant in the Cancer Prevention Programme (CaPP3) Links: Listen to: How can genomics help us understand cancer? "I think knowing is always a good thing. And obviously, I wish I'd known earlier, and then, I could have taken more measures earlier on. So I think knowledge is definitely a good thing. And it would be great if more people could be tested or could find out if they were carriers at an early age, I think." You can download the transcript or read it below. [00:00:00] Sharon: Welcome to Behind the Genes. In today's episode, we'll explore the research which shows how a low dose of aspirin can halve the risk of bowel cancer in people with Lynch syndrome. We'll hear about the real-life impact of living with the condition, and look at how genomics can help shape a more preventative approach to care in the future. [00:00:20] I'm Sharon Jones, and to help us unpack all of that, I'm joined by our guests, Dr. Katie Snape, principal clinician for population health at Genomics England; Sir John Burn, professor of clinical genetics at Newcastle University; and Drew Hyde, a participant in the Cancer Prevention Programme, which is also known as the CaPP3 trial. [00:00:42] So to start with the basics, Katie, can you walk us through what cancer is in simple terms? [00:00:50] Katie: Sure, Sharon. So, our body is made up of cells. Those are the building blocks that, that make us as humans and other creatures and plants. And our cells need to keep dividing throughout our lifetime as our bodies are growing and working normally. [00:01:06] And so we need to have processes in place in our body where our cells can divide, but then also stop dividing when we don't need them to carry on dividing. What happens in a cancer cell is basically that cell becomes abnormal, and it doesn't follow the normal checks and balances and rules of cell division. [00:01:23] So it starts to divide and grow uncontrollably, and it can start to invade other tissues and obviously, that can cause serious consequences. [00:01:33] Sharon: We'll hear a lot more from Dr. Katie Snape in this episode. But before we move on, I just wanted to flag that there was an episode of our Genomics 101 explainer series with Katie dedicated to helping us get to grips with how genomics can help us understand and diagnose cancer. [00:01:47] Do go and check that out. We'll put a link to that in the episode description. [00:01:54] So the World Health Organization estimates between 30 to 50% of all cancers are preventable. So, Katie, when we talk about cancer being preventable, what does that actually mean? And what's an example of cancer prevention that people might already know? [00:02:11] Katie: Yeah. So some cancers are due to chance or just mistakes happening as our cells copy. [00:02:19] Other cancers are because there has been damage to the genetic information within the cell that can be caused by certain things that can cause damage to DNA. So for example, a sort of obvious answer would be skin cancer. Skin cancers can be caused by sunlight, the, the UV light in the sun, and particularly if we burn our skin or, or get sun damage to our skin, increases the chance of us developing a skin cancer. [00:02:44] So you can think of lots of other examples such as cigarette smoking and lung cancer, and so we know that there are a number of different risk factors that increase the chance of our cells developing damage and becoming abnormal cells and growing uncontrollably. So when we talk about prevention, we might think, well, could we reduce some of those risk factors and therefore reduce the chance of those cells getting damaged and becoming cancer cells? [00:03:10] So I gave the example of skin cancer. We might put sun cream on if we're going out in the midday sun, for example. That reduces the damage of the UV light onto our skin cells. Or we might help people to go into a smoking prevention programme or, you know, other risk factors, such as we know that being very overweight can increase the chance of cancer. [00:03:31] We might help people get into more exercise regimes or improve people's diets. So those are the sorts of things that we might do sort of for environmental risk factors. But we also know, particularly in this context, that sometimes people are born, they carry genetic changes within their cells that they're born ...
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    36 mins
  • How can genomics help us understand rare conditions?

    How can genomics help us understand rare conditions?
    Jun 10 2026
    In this explainer episode, we’ve asked Jamie Ellingford, Lead Genomic Data Scientist for Rare Disease, to explain how genomics is helping us better understand rare conditions. You can also find a series of short videos explaining some of the common terms you might encounter about genomics on our YouTube channel. If you’ve got any questions, or have any other topics you’d like us to explain, let us know on podcast@genomicsengland.co.uk. You can download the transcript or read it below. [00:00:00] Florence: How can genomics help us better understand rare conditions? My name is Florence Cornish, and today I am joined by our Lead Genomic Data Scientist for Rare Disease, Jamie Ellingford, and he is going to be sharing lots more insights about the topic with us. So, I guess before we begin, Jamie, it might be useful if you could explain what we actually mean by the term 'rare condition'? [00:00:25] Jamie: Sure. Hi, Florence. So, a rare condition we define as something that impacts one in less than two thousand people, and so that's something that occurs really infrequently in the population. But we know that collectively there's lots of different rare diseases. And so, the estimates are that it's about one in seventeen people in the population that are impacted by some sort of rare disease, of which we think there's over seven thousand. But research that uses data that we have here at Genomics England as well as other sources is starting to uncover more and more of these individual rare disorders. So collectively, as I just said, one in seventeen individuals, we think, is impacted by a rare disease, and that equates to almost three and a half million people here in the UK. [00:01:15] Most of these rare conditions, we think, have a genetic basis, and perhaps we'll explain a little bit more about what that means. [00:01:22] Florence: Yeah, no, it would be great to talk a little bit more about that actually. So as you said, most rare conditions we think have a genetic cause, but I think it might be helpful if you could explain what we mean when we say that something 'has a genetic cause'. [00:01:35] Jamie: Of course. So maybe we go back to kind of the basics and kind of how a person is first formed. So, at that point of fertilisation, where the sex cells from mum and dad join, we inherit one copy of our genome from mum and one copy from dad, and it's the order and the composition of these letters in our genome which makes it unique to us. Most of that genome is absolutely identical to anyone else in the human population. And a small fraction of it is unique to us and is a combination of things that we've inherited from our mothers and our fathers. And when we think about genetic causes, largely, we look at those differences. And so, what is it that's different in individuals compared to the wider population that could be driving these rare conditions? [00:02:23] Florence: So could you maybe explain a little bit more about how people's genetic material, how people's genomes differ from one another? [00:02:30] Jamie: So there's lots of different ways that we can observe these genetic differences. So some of them impact individual letters, and we, we may swap a single letter for another. [00:02:41] We can also remove small sections, so it may be that a run of three or four of these letters is deleted from someone's genome. But on the opposite end of the scale, we can also see huge changes in how that genetic material looks. So perhaps a good way to think about this is as a story. And so if our, if our genome is like any kind of good fiction story that you would read, then we can have spelling mistakes that impact single words, [00:03:09] that impact whole paragraphs, or some which impact whole chapters. Lots of these different types of genetic causes can give rise to genetic conditions. And so even the smallest changes, the smallest spelling mistakes in words, can still give rise to rare genetic conditions. [00:03:26] Florence: We actually have a previous podcast episode that explores that topic in a lot more detail. So if listeners want to check that out, it's called "Are genetic conditions always inherited from parents?" So obviously, Jamie, we spoke quite a lot about DNA and genetic changes there, and this episode is all about how genomics specifically can help us better understand rare conditions. [00:03:47] Um, but what actually is genomics as a field of study? [00:03:53] Jamie: So simply put, genomics is the study of the whole genome, or at least as complete a picture of the genome as we can possibly represent. And so in the case of rare disorders, we use genomics to try and understand what the genome looks like from an affected child. [00:04:12] And, um, in some cases, we're also able to look at the whole genomes of their relatives, so ...
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    10 mins
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