Richard Dawkins published The Selfish Gene 40 years ago and Matt Ridley notes the anniversary in a Nature article published today (Jan. 28, 2016): In retrospect: The selfish gene.
I don't remember when I first read it—probably the following year when the paperback version came out. I found it quite interesting but I was a bit put off by the emphasis on adaptation (taken from George Williams) and the idea of inclusive fitness (from W.D. Hamilton). I also didn't much like the distinction between vehicles and replicators and the idea that it was the gene, not the individual, that was the unit of selection ("selection" not "evolution").
It is finally time to return to the problem with which we started, to the tension between individual organism and gene as rival candidates for the central role in natural selection...One way of sorting this whole matter out is to use the terms ‘replicator’ and ‘vehicle’. The fundamental units of natural selection, the basic things that survive or fail to survive, that form lineages of identical copies with occasional random mutations, are called replicators. DNA molecules are replicators. They generally, for reasons that we shall come to, gang together into large communal survival machines or ‘vehicles’.
Richard Dawkins
Some of you may not be able to come to our little "dialogue" tomorrow night. Don't worry, you can watch it on YouTube: Is There a Conflict Between Science and Religion?.
Currently there are two distinct views on the origin of life. The majority of scientists think that life arose in a prebiotic soup of complex organic molecules. Most of them think this "warm little pond" was the ocean (!) and most of them have bought into the stories about asteroids and comets delivering complex organic molecules to create a soup of amino acids and sugars. Presumably, all the earliest forms of life had to do was to join together the amino acids to make proteins and hook up the nucleotides to make RNA. The energy for these reactions was derived from breaking down all the glucose in the sweet ocean.
The answer is "no" according to Jerry Coyne and I agree with him [“Other ways of knowing”: Out of Africa].
What about music, art, and literature? I agree with him on that as well. Read Faith vs Fact.
James McGrath is a professor of religion at Butler University in Indianapolis, Indiana, USA.
He is one of those "sophisticated theologians" who dismiss modern atheists because we haven't spent years studying theology and because we haven't experienced the true existential angst of Jean-Paul Sartre. As a group, they hold to the position that the "New Atheists" are amateurs in the study of religion and their arguments can be easily dismissed.
Back in 2010, Richard Dawkins was answering questions on Reddit and one of the questions was "Out of all the evidence used to support the theory of evolution, what would you say is the strongest, most irrefutable single piece of evidence in support of the theory."
There are several ways to answer this question. Personally, I would take a minute to explain the difference between the "theory of evolution" and the history of life. I would point out that evolutionary theory includes things like Darwin's natural selection and there is overwhelming evidence proving that natural selection exists and operates today. The entire field of population genetics, which included other mechanisms of evolution such as random genetic drift, is massively supported by thousands of published papers in the scientific literature. There is absolutely no doubt at all that the current basic tenets of evolutionary theory are correct.
Confirmation bias is one of the major logical fallacies. When philosopher Chris DiCarlo and I were teaching a course on critical thinking we used to spend quite a bit of time on it because it's a very common trap. We are all guilty, from time to time, of focusing on just the evidence that confirms our belief and ignoring all the evidence that refutes it.
Some examples of confirmation bias are a bit more complicated than others and people typically mix together several different fallacious forms of argument. Here's an example from Denis Alexander's book Creation or Evolution (p. 213) that combines begging the question and confirmation bias.
I'm reading Creation or Evolution: Do we have to choose? by Denis Alexander in preparation for our discussion next Friday at Wycliffe College on the University of Toronto downtown campus [Discussing the conflict between science and religion with Denis Alexander].
Denis Alexander is a biochemist at the University of Cambridge (UK). I thought I'd share one of the stories in his book.
At the church I attend in Cambridge we baptised an undergraduate in the natural sciences who had come to a personal, saving faith in Christ from a completely atheistic background. As is usual in our church, just before being baptised she explained publicly to the whole congregation how she had become a Christian, telling us she had become convinced there must be a God while sitting through a standard biochemistry lecture, hearing the amazing story of how two meters (about six feet) of DNA are packaged into a single cell. Of course the lecturer was not talking in religious terms at all, but she described to us how the beauty of that engineering feat overwhelmed her as she listened, giving her the deep intuition there must be a God, so leading her onward in he personal pilgrimage to put her trust in this creator God through Christ. Truly natural theology at work!
That got me thinking. I've been describing chromatin and packing in my textbooks since the first version in 1987. There must have been several hundred thousand students who have read my descriptions since then.
I wonder how many I've converted?
I was searching for information about Craig Venter and his position on junk DNA when I stumbled upon this post by Bryony Graham: Why we still don’t have personalised medicine, 15 years after sequencing the human genome. She is a postdoc in Molecular Genetics at the University of Oxford so the subject is within her area of expertise.1
The post is from Dec. 1, 2015—that's only one month ago so she should be aware of all the facts concerning junk DNA.
If you are going to write about a subject in your area of expertise then it's reasonable to make yourself informed, especially if you know that the subject is controversial. For some strange reason, this common sense approach seems to be ignored when discussing genomes, evolution, and junk DNA. I don't know why some researchers think they know enough about a subject when all they've done (apparently) is read a few popular press reports.
Let's look at what Bryony Graham (@byrony_g) writes to see whether she is behaving like a proper scientist should behave when writing for the general public. It's worth noting that she was on the shortlist for the 2011 Max Perutz Science Writing Award so somebody must think she's a good science writer.
Not all junk DNA is rubbish
The sequence of the human genome was announced on June 26, 2000 although the actual sequence wasn't published until a year later. There were two sequences. One was the product of the International Human Genome Project led by Francis Collins who said,
"It is humbling for me and awe-inspiring to realize that we have caught the first glimpse of our own instruction book, previously known only to God."
The sequence was a composite of a number of individuals.
The second sequence was from Celera Genomics, led by Craig Venter. It was mostly his genome, making him the second being to know his own instruction book ... right after God.
It took another seven years to finish and publish the complete sequence of all of Craig Venter's chromosomes. The paper was published in PLoS Biology (Levy et al., 2007) and highlighted in a Nature News article: All about Craig: the first 'full' genome sequence.
What's unique about this genome sequence—other than the fact that it's God's Craig Venter's—is that all 46 chromosomes were sequenced. In other words, enough data was generated to put together separate sequences of each pair of chromosomes. That produces some interesting data.
There were 4.1 million differences between homologous chromosomes (22 autosomes). 78% of these events were single nucleotide polymorphisms (SNPs). The rest were indels (insertions and deletions) and these accounted for 0.9 million nucleotides. Thus, indels made up 74% of the total number of variant nucleotide sequence.
In addition, there were 62 copy number variants (duplication) accounting for an additional 10Mb of variation between haploid sets of chromosomes. The total number of nucleotide differences is 13.9Mb when you add up all the indels, SNPs, and duplications. The two haploid genomes differ by about 0.5% by this calculation (total amount sequenced was 2,895Mb).
When the two copies of all annotated genes were compared, it turned out that 44% were heterozygous—the two copies were not identical.
Craig Venter's genome sequence differs from the composite human reference genome at 4,118,889 positions. Most of these were already known as variants in the human population but 31% were new variants (in 2007).
Venter has written about his genome sequence in A Life Decoded. He has variants in his APOE gene sequence that are associated with Alzheimer's and cardiovascular diseases. He has variants in his SORL1 that also make him at risk for Alzheimer's according to 2007 data. Just about everyone who gets their genomes sequenced will find variants that put them at greater risk for some genetic disease.
Levy, S., Sutton, G., Ng, P.C., Feuk, L., Halpern, A.L., Walenz, B.P., Axelrod, N., Huang, J., Kirkness, E.F., Denisov, G., Lin, Y., MacDonald, J.R., Pang, A.W.C., Shago, M., Stockwell, T.B., Tsiamouri, A., Bafna, V., Bansal, V., Kravitz, S.A., Busam, D.A., Beeson, K.Y., McIntosh, T.C., Remington, K.A., Abril, J.F., Gill, J., Borman, J., Rogers, Y.-H., Frazier, M.E., Scherer, S.W., Strausberg, R.L., and Venter, J.C. (2007) The diploid genome sequence of an individual human. PLoS Biol, 5(10), e254. [doi: 10.1371/journal.pbio.0050254]
Massimo Pigliucci is an atheist who thinks that science and religion are compatible because they rule in different domains. He takes a very narrow view of "science"— one that excludes the work of historians and philosophers who are presumably using some other way of knowing. (He doesn't tell us what that is.)
I prefer the broad view of science as a way of knowing that relies on evidence, rational thinking, and healthy skepticism. This broad view of science is not universal—but it's not uncommon. In fact, Alan Sokel has defended this view of Massimo Pigiucci's own blog: [What is science and why should we care? — Part III]. According to this view, any attempt to gain knowledge should employ the scientific worldview. Historian and philosophers should follow this path if they hope to be successful. Pigliucci should know that there are different definitions and any discussion of the compatibility of science and religion must take these differences into account.
We know quite a lot about the origin of new genes (Carvunis et al., 2012; Kaessman, 2010; Long et al., 2003; Long et al., 2013; Näsvall et al., 2012); Neme and Tautz, 2013; Schlötterer, 2015; Tautz and Domazet-Lošo (2011); Wu et al., 2011). Most of them are derived from gene duplication events and subsequent divergence. A smaller number are formed de novo from sequences that were not part of a gene in the ancestral species.
In spite of what you might have read in the popular literature, there are not a large number of newly formed genes in most species. Genes that appear to be unique to a single species are called "orphan" genes. When a genome is first sequenced there will always be a large number of potential orphan genes because the gene prediction software tilts toward false positives in order to minimize false negatives. Further investigation and annotation reduces the number of potential genes.
I criticized Nelson Lau for comments he made about the junk DNA debate [Brandeis professor demonstrates his ignorance about junk DNA].
Here is his response,
Dear Dr. Graur and Dr. Moran,
Thanks for reading the commentary on my university’s communication page, hastily written for brevity and digestibility by me and our science communication officer, Lawrence Goodman. I was originally hoping the piece could focus on my latest research, but it turned into this sort of general Q&A chat. The commentary was written rather quickly and meant for a general audience perusing Brandeis research, so it is obviously not a peer-reviewed scientific publication.
I am well aware of both your reputations as fiery critics and experts of evolutionary biology, and you have somewhat of a following on the internet. Some of your earlier blog posts have been entertaining and even on point regarding how big projects like ENCODE have over-hyped the functional proportions of our genomes. So, it does NOT surprise me one bit that I would become your latest vitriolic target in your posts here, and here.
Could I learn more from you two about evolutionary biology theory? Indeed, I could. Can we revise our Q&A commentary to be more scientifically accurate while still being digestible to a general audience? Perhaps, if we have the time and I survive my tenure review, we may do so and take your input into consideration. Why respond and risk another snarky post from you guys? I could care less about your trivial blog critiques when I’ve received plenty of grants and paper rejections that cut much deeper into my existence as a young academic struggling to survive when the academic track has never been more challenging (<10% grant success rates at NIH, NSF, CIHR, etc).
I’m responding to ask that both of you reflect on the message your posts are sending to students and postdocs. As a young scientist, having a chat with my university PR rep, I have to now think twice about two senior tenured professors slamming my scientific credibility on your internet soapbox without a single direct email to me. How passive-aggressive!
Your message is saying that Academic science even less inviting to young scientists as it is, with faculty positions and grants falling way short of demand, and the tough sacrifices every young scientist is already making for the craft that we love. If we condone this type of sniping behavior, why would any young scientist want to learn and discuss with the older scientists of your generation?
The Science Blogosphere, Twittersphere, and the Open Data movements are the next generation of platforms for science communication, and I commend you two for being vocal contributors to these platforms quite early on. However, I also recently wrote a guest post on Bjorn Bremb’s blog arguing that for open data and discussion to work, we scientists need to uphold decorum and civility.
A direct email from you to me expressing your scientific concerns of our commentary would have been a better way to go. I am willing to stand corrected. Your blog posts, however, are disappointing and appear petty to me. Let’s all set a better example here for our trainees.
If you wish to post this response verbatim on your blogs, go ahead, since I had thought of posting this response on your blog’s comments section. But to follow my own advice, I’ll try a direct email to you first. And if I don’t hear back from you, I may then ask my friend Bjorn to help me post this on his blog.
Thank you for reading this till the end,
Nelson
Nelson Lau, Ph.D.
Assistant Professor - Biology
Judge Starling (Dan Graur) has alerted me to yet another young biologist who hasn't bothered to study the subject of genomes and junk DNA [An Ignorant Assistant Professor at @BrandeisU Explains “Junk DNA”].
This time it's Assistant Professor of Biology Nelson Lau. He studies Piwi proteins and PiRNAs.
Lau was interviewed by Lawrence Goodman, a science communication officer at Brandeis University: DNA dumpster diving. The subject is junk DNA and you will be astonished at how ignorant Nelson Lau is about a subject that's supposed to be important in his work.
How does this happen? Aren't scientists supposed to be up-to-date on the scientific literature before they pass themselves off as experts? How can an Assistant Professor make such blatantly false and misleading statements about his own area of research expertise? Has he never encountered graduate students, post-docs, or mentors who would have corrected his misconceptions?
Here's the introduction to the interview,
Since the 1960s, it's largely been assumed that most of the DNA in the human genome was junk. It didn't encode proteins -- the main activity of our genes-- so it was assumed to serve no purpose. But Assistant Professor of Biology Nelson Lau is among a new generation of scientists questioning that hypothesis. His findings suggest we've been wrong about junk DNA and it may be time for a reappraisal. If we want to understand how our bodies work, we need to start picking through our genetic garbage.
BrandeisNow sat down with Lau to ask him about his research.
There's nothing wrong with being a "new generation" who questions the wisdom of their elders. That's what all scientists are supposed to do.
But there are certain standards that apply. The most important standard is that when you are challenging other experts you'd better be an expert yourself.
First off, what is junk DNA?
About two percent of our genome carries out functions we know about, things like building our bones or keeping the heart beating. What the rest of our DNA does is still a mystery. Twenty years ago, for want of a better term, some scientists decided to call it junk DNA.
Dan has already addressed this response but let me throw in my own two cents.
There was never, ever, a time when knowledgeable scientists said that all 98% of the DNA that wasn't part of a gene was junk. Not today, not twenty years ago (1996), and not 45 years ago.
There has never been at time since the 1960s when all non-gene DNA was a mystery. It certainly isn't a mystery today. If you don't know this then you better do some reading ... quickly. Google could be your friend, Prof. Lau, it will save you from further embarrassment. Search on "junk DNA" and read everything ... not just the entries that you agree with.
I added a bunch of links at the bottom of this post to help you out.
Is it really junk?
There’s two camps in the scientific community, one that believes it doesn’t do anything and another that believes it’s there for a purpose.
And you’re in the second camp?
Yes. It's true that sometimes organisms carry around excess DNA, but usually it is there for a purpose. Perhaps junk DNA has been coopted for a deeper purpose that we have yet to fully unravel.
It is possible that the extra DNA in our genome has an unknown deeper purpose but right now we have more than enough information to be confident that it's junk. You have to refute or discredit all the work that's been done in the past 40 years in order to be in the second camp.
I strongly suspect that Prof. Lau has not done his homework and he doesn't know the Five Things You Should Know if You Want to Participate in the Junk DNA Debate.
What possible "deep purpose" could this DNA have?
Maybe when junk DNA moves to the right place in our DNA, this could cause better or faster evolution. Maybe when junk genes interacts with the non-junk ones, it causes a mutation to occur so humans can better adapt to changes in the environment.
Most of the undergraduates who took my course could easily refute that argument. I'm guessing that undergraduates in biology at Brandeis aren't as smart. Or maybe they're just too complacent to challenge a professor?
We've got a serious problem here folks. There are scientists being hired at respectable universities who aren't keeping up with the scientific literature in their own field. How does this happen? Are there newly hired biology professors who don't understand evolution?
Eddy, S.R. (2012) The C-value paradox, junk DNA and ENCODE. Current Biology, 22:R898. [doi: 10.1016/j.cub.2012.10.002]
Niu, D. K., and Jiang, L. (2012) Can ENCODE tell us how much junk DNA we carry in our genome?. Biochemical and biophysical research communications 430:1340-1343. [doi: 10.1016/j.bbrc.2012.12.074]
Doolittle, W.F. (2013) Is junk DNA bunk? A critique of ENCODE. Proc. Natl. Acad. Sci. (USA) published online March 11, 2013. [PubMed] [doi: 10.1073/pnas.1221376110]
Graur, D., Zheng, Y., Price, N., Azevedo, R. B., Zufall, R. A., and Elhaik, E. (2013) On the immortality of television sets: "function" in the human genome according to the evolution-free gospel of ENCODE. Genome Biology and Evolution published online: February 20, 2013 [doi: 10.1093/gbe/evt028
Eddy, S.R. (2013) The ENCODE project: missteps overshadowing a success. Current Biology, 23:R259-R261. [10.1016/j.cub.2013.03.023]
Hurst, L.D. (2013) Open questions: A logic (or lack thereof) of genome organization. BMC biology, 11:58. [doi:10.1186/1741-7007-11-58]
Kellis, M., Wold, B., Snyder, M.P., Bernstein, B.E., Kundaje, A., Marinov, G.K., Ward, L.D., Birney, E., Crawford, G. E., and Dekker, J. (2014) Defining functional DNA elements in the human genome. Proc. Natl. Acad. Sci. (USA) 111:6131-6138. [doi: 10.1073/pnas.1318948111]
Morange, M. (2014) Genome as a Multipurpose Structure Built by Evolution. Perspectives in biology and medicine, 57:162-171. [doi: 10.1353/pbm.2014.000]
Palazzo, A.F., and Gregory, T.R. (2014) The Case for Junk DNA. PLoS Genetics, 10:e1004351. [doi: 10.1371/journal.pgen.1004351]
