Science
Related: About this forumGenetic Sequencing of Mahi Mahi to Determine the Exposure Level From the Deep Horizon Oil Disaster.
The paper I'll discuss in this relatively brief post is this one: Whole-Transcriptome Sequencing of Epidermal Mucus as a Novel Method for Oil Exposure Assessment in Juvenile Mahi-Mahi (Coryphaena hippurus) (Justin B. Greer,*, Nicolette E. Andrzejczyk,*, Edward M. Mager, John D. Stieglitz,§ Daniel Benetti,§ Martin Grosell,∥ and Daniel Schlenk,?, Environ. Sci. Technol. Lett. 2019, 6, 538?544)
One of the joys of writing posts in this "sleepy little DU science forum" - as I've heard it described - is the privilege of learning things as I write. Over the last few weeks, I've been writing a somewhat involved post comparing two recently published scientific papers about two radioactive contamination events, one of which is everyone's favorite with the possible exception of Chernobyl, Fukushima, and the other involving radioactive contamination of a San Joaquin oil field in California. Writing this rather long post has stimulated me to do some interesting reading on the human physiology of certain radioactive nuclides, including two that surely killed a rather famous scientist.
One of the side notes I found myself going down is the case of the famous scientific paper about the "Fukushima Tuna Fish" which received vast international attention, much to the chagrin of the paper's authors, and believe me, when a scientist gets a paper with an international attention all over the news media, "chagrin" is not usually the word associated with the attention.
Anyway, this is not that post. I'm still working on it and it isn't done.
It proves to timely: The recent Fukushima attention concerns the proposal to dump "radioactive" seawater into the sea - it happens that there is no such thing, and never has been such a thing as seawater that isn't radioactive - the dumping is perfectly OK with me. If one supports nuclear energy as I do, one has to greet such ignorance with a mixture of amusement and despair. If the Fukushima "radioactive seawater" is dumped, we can expect the morons at Greenpeace to have a festival of clownish trivializing stupidity featuring dressing up and cruising around in diesel powered boats in their ongoing efforts to be sure the planet commits a suicide worthy of the Darwin Award.
I'm sure the reactions will be as stupid as the reaction I experienced here some time ago when a correspondent dug up one of my old posts to announce that the world was ending because a tunnel collapsed on the radioactively contaminated Hanford Nuclear Weapons Complex in Washington State, a collapse also widely reported in the media, albeit not as actively as the famous Fukushima tuna fish.
God bless the ignore list.
Anyway, the paper here is about another kind of fish, a fish contaminated by petroleum leaks, in this case, oil from the Deepwater Horizon Oil.
From the introduction to the paper:
As biological barriers go, the one with which I am most familiar is human skin, with particular focus on its molecular biology, human skin a fascinating organ, but the authors here are concerned with another complex biological barrier, the mucus layer coating fish, also a fascinating organ with fascinating molecular biology which, as the authors note...
The authors focus on an usually studied subclass of biological barrier molecules, specifically RNA.
Recently there has been increased interest in what is called the "exposome" which is the molecular signatures of exposure to external molecules and stresses, many of which ultimately show up in toxicological syndromes. This is a relatively new undertaking and is proving to be quite fascinating. Here, for example is a link to a recent paper upon which I stumbled, the expsome associated with Alzheimer's disease: The Alzheimer's Disease Exposome. Publication of this paper, by the way, does not "prove" anything at all about Alzheimer's disease, but it offers an important area of inquiry worthy of study.
As they are sometimes and somewhat naively interpreted, the nucleic acids represent something like a computer program of life, and these "programs" are of two types, the germline type - that which is heritable - and the somatic type, that which is involved in the control and feedback loops of the molecular biology of living things. In somatic nucleic acids, a number of changes accumulate normally during life, these are called "epigenetic changes" and as such represent the exposome. These somatic changes are known to control normal and abnormal processes like, in the former case, aging and development, in the latter case, diseases like cancer and autoimmune diseases like lupus and rheumatoid arthritis.
The oil utilized in this study to examine the effects of Deepwater Horizon spill was real Deepwater Horizon Oil, collected from the sea and stored as such:
Cool, I think. I'm glad scientists collected "DWH" oil samples and stored them for study years after the fact. Excellent scientific forethought!
Some graphics from the paper:
The authors studied, using modern technology, 194,282 fish genes in the mucus barrier.
They found:
... Together, our data suggest that mucosal mRNA abundance may be indicative of whole-animal changes in immune-related function in PAH-exposed fish. IPA also predicted alterations in toxicity functions induced by oil exposure. The top-ranked toxicity functions in the low- HEWAF exposure were liver fibrosis, liver hyperplasia, congenital heart anomaly, and cardiac enlargement (Figure 1C and Table S12). Similarly, liver enlargement, pulmonary hypertension, liver hyperbilirubinemia, and liver hyperplasia were the top-ranked toxicity functions in the high-HWAF exposure. Of all toxicity functions, 17 cardiac functions were predicted to be altered in the low-HEWAF exposure and 11 in the high-HEWAF exposure, with many overlapping categories such as cardiac enlargement, cardiac arrhythmia, cardiac fibrosis, and cardiac necrosis/cell death (Table S12). In addition, there was a predicted inhibition of cardiac muscle function, cardiac muscle contractility, and abnormality of the heart ventricle (Figure 2B), which are cardiac phenotypes known to be altered by crude oil-derived PAH exposure in fish.37,38 Alterations in Ca2+ homeostasis were also predicted from the mucus transcriptional profile, such as decreased mobilization of Ca2+ and an increased quantity of Ca2+ (Figure 2B). Transcripts of ryanodine receptor 2 (ryr2), the primary mediator of calcium-induced Ca2+ release required for cardiomyocyte contraction, were upregulated in the mucus and have also been shown to be dysregulated in oil-exposed mahi-mahi and Atlantic haddock (Melanogrammus aeglef inus) embryos (Table S11).39,40
IPA here refers to "Ingenuity Pathway Analysis" a bioinformatics software tool. IPA, Qiagen
The authors state that to their knowledge, this is the first paper to look at this particular pathway in determining the exposome of oil spills on marine life.
This paper will get no attention from our distracted media with its selective attention, the same media that gave the intellectually and morally challenged awful criminal Donald J. Trump the White House, "...because...her emails..."
In reality the "election" of Donald J. Trump is a trivial, if wholly unfortunate, blip in world history. The destruction of the planetary atmosphere and oceans by dangerous fossil fuels like, but not limited to, petroleum, "...because...Fukushima..." is not trivial.
I wish you a pleasant and safe Friday the 13th.