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Beyond Inheritance: Our Ever-Mutating Cells and a New Understanding of Health
The new science of how our DNA mutates over our lifetimes, with radical implications for our health and medical treatments.
We tend to think of Darwinian evolution as a process that plays out over generations. But our understanding of natural selection is itself evolving. Science writer Roxanne Khamsi reveals our bodies as active landscapes of evolution. Genetic mutations are constantly happening within your body—even as you read this.
In this astonishing book, Khamsi shows how our bodies comprise cells that change over the course of a lifetime, mutating, competing, and evolving. Our immune systems fight viruses by evolving millions of different cells that produce distinct antibodies for dealing with invaders, while cancer and bacterial cells evolve in response to our bodies’ attempts to destroy them. Meanwhile, the random mutations of cells throughout our bodies have immense potential to harm us—and heal us.
Beyond Inheritance reveals our DNA as a dynamic, mutating entity. By letting go of the antiquated idea that each cell has the same exact DNA and embracing a messier—but truer—reality, we can usher in a whole new era of medicine. Khamsi introduces readers to the scientists who are harnessing evolutionary forces to design vaccines and to battle cancer. This book will open your eyes to the immense and ongoing genetic diversity that exists within each human body and its incredible potential to impact your health and well-being.
We tend to think of Darwinian evolution as a process that plays out over generations. But our understanding of natural selection is itself evolving. Science writer Roxanne Khamsi reveals our bodies as active landscapes of evolution. Genetic mutations are constantly happening within your body—even as you read this.
In this astonishing book, Khamsi shows how our bodies comprise cells that change over the course of a lifetime, mutating, competing, and evolving. Our immune systems fight viruses by evolving millions of different cells that produce distinct antibodies for dealing with invaders, while cancer and bacterial cells evolve in response to our bodies’ attempts to destroy them. Meanwhile, the random mutations of cells throughout our bodies have immense potential to harm us—and heal us.
Beyond Inheritance reveals our DNA as a dynamic, mutating entity. By letting go of the antiquated idea that each cell has the same exact DNA and embracing a messier—but truer—reality, we can usher in a whole new era of medicine. Khamsi introduces readers to the scientists who are harnessing evolutionary forces to design vaccines and to battle cancer. This book will open your eyes to the immense and ongoing genetic diversity that exists within each human body and its incredible potential to impact your health and well-being.
304 pages, Hardcover
First published April 21, 2026
About the author
Roxanne Khamsi
1 book4 followersRoxanne Khamsi is a writer and editor formerly based in Brooklyn and now living in Montreal. Her articles have appeared in publications such as The New York Times, The Economist, Popular Science, Scientific American, Slate, Nature, New York magazine, WIRED magazine and the MIT Technology Review.
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Displaying 1 - 9 of 9 reviews
May 6, 2026
I love reading science books (especially those about genetics, disease, or physics) and this is the ideal. It was full of new-to-me information and it was organized in a clear and engaging way.
May 13, 2026
This book is about the fact that the cells in our bodies are not genetically identical, and that some of them mutate in consequential ways that can give us diseases. We understand this process in cancer, but there are many other examples that seem to be discovered or at least better understood in the last several decades. This is no doubt due to developing better methods for sequencing the genetic material of individual mammalian cells, which they have had since 2009. The cost of sequencing has dropped dramatically. With inexpensive means of sequencing the genome of individual cells there is lot more productive research on cellular mutations and their downstream effects. It is this active area of research that the book highlights. Another related topic that she covers is the evidence that the accumulation of mutations in cells might be important to the process of aging.
The author repeatedly tells us that Darwin’s survival of the fittest applies to cells within the body just as it does to organisms outside of the body. It is a little difficult to think of cells in a healthy organism competing, when the primary function of most of them is to co-operate for the benefit of the body. Most of the mutated cells that propagate seem to be harmful and there appear to be many illnesses that could be explained by this behavior.
I found this book a little difficult to read and stay focused on. I’m not sure if it was the nature of the topic, the way the author wrote, or just my inability to concentrate. There are a lot of obscure terms and conditions in the book. For example, consider this quote: “The conditions described in the previous chapter—PNH, loss of Y, CHIP, and VEXAS…” Because the author is covering a wide range of genetically caused diseases, she jumps around in time, space, and researchers to describe the discovery process. The need to credit the researchers can detract from the smooth development of the narrative. Many diseases are mentioned in one or two paragraphs as examples of genetic diseases not inherited, but it feels like an onslaught of information that is hard to absorb. There are lots of studies with small sample sizes that hint at what might be important evidence of mutations causing one disease or another, but it is early in the discovery process and it is difficult to know how important each discovery is.
However, there were a lot of very interesting bio-medical stories and tidbits in this book and I am glad I finished reading it.
The author repeatedly tells us that Darwin’s survival of the fittest applies to cells within the body just as it does to organisms outside of the body. It is a little difficult to think of cells in a healthy organism competing, when the primary function of most of them is to co-operate for the benefit of the body. Most of the mutated cells that propagate seem to be harmful and there appear to be many illnesses that could be explained by this behavior.
I found this book a little difficult to read and stay focused on. I’m not sure if it was the nature of the topic, the way the author wrote, or just my inability to concentrate. There are a lot of obscure terms and conditions in the book. For example, consider this quote: “The conditions described in the previous chapter—PNH, loss of Y, CHIP, and VEXAS…” Because the author is covering a wide range of genetically caused diseases, she jumps around in time, space, and researchers to describe the discovery process. The need to credit the researchers can detract from the smooth development of the narrative. Many diseases are mentioned in one or two paragraphs as examples of genetic diseases not inherited, but it feels like an onslaught of information that is hard to absorb. There are lots of studies with small sample sizes that hint at what might be important evidence of mutations causing one disease or another, but it is early in the discovery process and it is difficult to know how important each discovery is.
However, there were a lot of very interesting bio-medical stories and tidbits in this book and I am glad I finished reading it.
April 22, 2026
Beyond Inheritance by Roxanne Khamsi delivers a precise and compelling reframing of one of biology’s most entrenched assumptions, that our DNA is fixed. Instead, Khamsi presents the human body as an evolving ecosystem, where mutation and selection operate continuously within us.
What makes the work particularly effective is its ability to translate complex biological processes into a coherent narrative without oversimplification. By connecting cellular evolution to immunity, cancer, and emerging therapies, the book bridges fundamental science with real-world medical implications in a way that is both intellectually rigorous and broadly accessible.
The result is a forward-looking, paradigm-shifting exploration that positions evolutionary biology not as background theory, but as an active framework for the future of medicine, one that has the potential to redefine how we diagnose, treat, and understand disease.
What makes the work particularly effective is its ability to translate complex biological processes into a coherent narrative without oversimplification. By connecting cellular evolution to immunity, cancer, and emerging therapies, the book bridges fundamental science with real-world medical implications in a way that is both intellectually rigorous and broadly accessible.
The result is a forward-looking, paradigm-shifting exploration that positions evolutionary biology not as background theory, but as an active framework for the future of medicine, one that has the potential to redefine how we diagnose, treat, and understand disease.
Review of advance copy received from Netgalley
I found this book informative. Although the actual science can be quite complex, I think that Khamsi did a good job of translating it into plain language. I also liked the case-based approach and the author’s journey. And I did chuckle a couple of times over some of the clever writing. Overall, this book was well worth reading. Thank you to Edelweiss and Riverhead Books for the advance reader copy.
April 29, 2026
This was an interesting look at what our genes on their own after we are born and they are left to their own devices. Most mutations are bad (cancer), but there were some instances of good mutations mentioned. I wanted to know how rare of an occurrence that was though, because it can't be frequent. I guess we can study it and try to replicate it when it does happen.
May 26, 2026
TLDR? Wear sunscreen on your eyelids.
Seriously though, parts of this book were mind boggling. Some parts were over my head or a little too history focused but the medical stories were really fascinating.
Seriously though, parts of this book were mind boggling. Some parts were over my head or a little too history focused but the medical stories were really fascinating.
May 8, 2026
Well written and understandable.
May 13, 2026
A compelling and deeply reported look at the surprising ways that our DNA can change throughout our lives. My copy is full of tabs, underlines and notes — totally fascinating read. Loved it!
May 1, 2026
The latest word from your genes--they're changing!
The human genome project spawned revolutions in genetics, so we've all been told, but also in proteonomics, in epigenetics, and in other associated disciplines. One theme that has emerged from them is that our individual genetic heritage isn't immutable. Our reproductive and our somatic DNA is constantly undergoing mutation. "Beyond Inheritance" tells us that story. And its author, Roxanne Khamsi, writes lucidly and engagingly. Read this book and learn.
The human genome project spawned revolutions in genetics, so we've all been told, but also in proteonomics, in epigenetics, and in other associated disciplines. One theme that has emerged from them is that our individual genetic heritage isn't immutable. Our reproductive and our somatic DNA is constantly undergoing mutation. "Beyond Inheritance" tells us that story. And its author, Roxanne Khamsi, writes lucidly and engagingly. Read this book and learn.
Displaying 1 - 9 of 9 reviews