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Society for Molecular Biology and Evolution (SMBE) spreads misinformation about junk DNA

The Society for Molecular Biology and Evolution (SMBE) is a pretigious society of workers in the field of molecular evolution. I am a member and I have attended many of their conferences. SMBE sponsors several journals incucluding Genome Biology and Evolution (GBE), which is published by Oxford Academic Press.

The latest issue of GBE has a paper by Stitz et al. (2021) that describes some repetitive elements in the platyhelminth Schistosoma mansoni. The authors conlcude that some of these elements might have a function and this prompts them to begin their discussion with the following sentences.

The days of “junk DNA” are over. When the senior authors of this article studied genetics at their respective universities, the common doctrine was that the nonprotein coding part of eukaryotic genomes consists of interspersed, “useless” sequences, often organized in repetitive elements such as satDNA. The latter might have accumulated during evolution, for example, as a consequence of gene duplication events to separate and individualize gene function (Britten and Kohne 1968; Comings 1972; Ohno 1999). This view has fundamentally changed (Biscotti, Canapa, et al. 2015), and our study is the first one addressing this issue with structural, functional, and evolutionary aspects for the genome of a multicellular parasite.

It is unfortunate that the senior authors didn't receive a good undergraduate education but one might think that they would rectify that problem by learning about genomes and junk DNA before publishing in a good journal devoted to genomes and evolution. Alas, they didn't and, even worse, the journal published their paper with those sentences intact.

As you might imagine, these statements were seized upon by Intelligent Design Creationists who wasted no time in posting on their creationist blog [Oxford Journal: “The Days of ‘Junk DNA’ Are Over ”].

But that's not the worst of it. The same issue contains an editorial written by Casey McGrath who self identifies as a employee of the Society for Molecular Biology and Evolution in Lawrence Kansus (USA). She is the Social Media Editor for Genome Biology and Evolution. The title of her editorial is "Highlight—“Junk DNA” No More: Repetitive Elements as Vital Sources of Flatworm Variation" (McGrath, 2021). She starts off by repeating and expanding upon the words of the senior authors of the study that I referred to above.

“The days of ‘junk DNA’ are over,” according to Christoph Grunau and Christoph Grevelding, the senior authors of a new research article in Genome Biology and Evolution. Their study provides an in-depth look at an enigmatic superfamily of repetitive DNA sequences known as W elements in the genome of the human parasite Schistosoma mansoni (Stitz et al. 2021). Titled “Satellite-like W elements: repetitive, transcribed, and putative mobile genetic factors with potential roles for biology and evolution of Schistosoma mansoni,” the analysis reveals structural, functional, and evolutionary aspects of these elements and shows that, far from being “junk,” they may exert an enduring influence on the biology of S. mansoni.

“When we studied genetics at university in the 1980s, the common doctrine was that the non-protein coding parts of eukaryotic genomes consisted of interspersed, ‘useless’ sequences, often organized in repetitive elements like satellite DNA,” note Grunau and Grevelding. Since then, however, the common understanding of such sequences has fundamentally changed, revealing a plethora of regulatory sequences, noncoding RNAs, and sequences that play a role in chromosomal and nuclear structure. With their article, Grunau and Grevelding, along with their coauthors from Justus Liebig University Giessen, University of Montpellier, and Leipzig University, contribute further evidence to a growing consensus that such sequences play critical roles in evolution.

There's no rational excuse for publishing the Stitz et al. paper with those ridiculous statements and there's no rational excuse for compounding the error by highlighting them in an editorial comment. The Society for Molecular Biology and Evolution should be ashamed and embarrassed and they should issue a retraction and a clarification. They should state clearly that junk DNA is alive and well and supported by so much evidence that it would be perverse to deny it.


McGrath,C. (2012) Highlight—“Junk DNA” No More: Repetitive Elements as Vital Sources of Flatworm Variation. Genome Biology and Evolution 13: evab217 [doi: 10.1093/gbe/evab217]

Stitz, M., Chaparro, C., Lu, Z., Olzog, V.J., Weinberg, C.E., Blom, J., Goesmann, A., Grunau, C. and Grevelding, C.G. (2021) Satellite-Like W-Elements: Repetitive, Transcribed, and Putative Mobile Genetic Factors with Potential Roles for Biology and Evolution of Schistosoma mansoni. Genome Biology and Evolution 13:evab204. [doi: 10.1093/gbe/evab204]



This post first appeared on Sandwalk, please read the originial post: here

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Society for Molecular Biology and Evolution (SMBE) spreads misinformation about junk DNA

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