Category Archives: Transhuman News

Scientists, biotech companies, and medical societies are reacting with outrage and dismay to President Trumps executive order (EO), signed on June 21, 2020, that restricts the issuance of new work visas for skilled workers and managers (and au pairs) through the end of 2020.

The visas affected include the H-1B, H-4, H-2B, L-1, and J categories. The EO means that foreign graduate students and postdocs would be banned from entering the United States. Almost every major research lab includes a diverse mix of research talent from around the world. Many of these scientists eventually lead their own groups, move to industry, and/or become naturalized U.S. citizens.

In the science community, many are reacting and expressing their concerns about the future of labs, and how the EO will affect research and innovation. Akiko Iwasaki, PhD, who is a professor in the department of immunobiology and department of molecular, cellular, and developmental biology at Yale University (and an investigator of the Howard Hughes Medical Institute) expressed her dismay.

Iwasaki tweeted: This is the worst thing thats happened to U.S. science and innovation. Banning immigrant scientists will lead to a devastating loss in creativity and productivity. Pretty much every lab in the U.S. will suffer.

The EO also extends Trumps April 22 order denying green cards to applicants in several immigrant visa categories. The Trump Administration says its goal is to protect 520,000 jobs and get Americans back to work. We have a moral duty to create an immigration system that protects the lives and jobs of our citizens, stated President Trump.

But many scientists in academia and industry not only disagree with the executive order but also highlight how their labs would look without their immigrant postdocs. Samantha Morris, PhD, an assistant professor of genetics, and developmental biology at Washington University School of Medicine, expressed her frustrations on Twitter.

I invest a lot of energy trying to recruit postdocs to my lab. I haven't received a SINGLE non-immigrant postdoc application in the past five years

Samantha Morris (@morris_lab) June 23, 2020

Florian Krammer, PhD, professor of microbiology at the Icahn School of Medicine at Mount Sinai in New York, expressed concern about colleagues working on SARS-CoV-2. I am about to hire a postdoc from Spain who is specialized in vaccine production and a postdoc from Japan who is specialized in mucosal immunity to virus infections. I might not be able to hire them if this is signed. Both would have worked on SARS-CoV-2 and influenza virus. Krammer also posted a picture of his lab with and without immigrants, and the image paints a picture of what research labs may look like.

My lab with and without immigrants. pic.twitter.com/aLJmUQFXEM

Florian Krammer (@florian_krammer) June 15, 2020

Lars Dietrich, PhD, associate professor, Department of Biological Sciences at Columbia University, who came to the U.S. through a work visa expressed his thoughts on the EO. The visa situation is disturbing. I came to the U.S. on a J1 visa, then transferred to H-1B before becoming faculty at Columbia University. Ive always been inspired by the way that, in U.S. academia, people of diverse backgrounds can come together to do transformative science. It reflects values that the U.S. can be proud of, and it sets an example. It really saddens me to see the erosion of this commitment to diversity.

Rebecca Bernhard, a partner at the law firm Dorsey & Whitney in immigration, labor and employment practices, highlighted some exemptions in the EO. One key exemption is for workers involved in the U.S. food supply system. This exemption should cover people involved in meatpacking and processing plants, as well as all aspects of the food supply chain from production to transportation and logistics, Bernhard said.

Another key exemption is for medical personnel working on COVID-19 research or treatment. Most physicians, nurses, and other medical personnel should still be able to obtain visas, Bernhard stated.

But what will this mean for companies working on vaccines and treatments for COVID-19? Major companies such as Moderna Therapeutics, GlaxoSmithKline, Inovio, and others who are currently working on a vaccine or treatment for COVID-19, had received approvals from the Department of Labor to hire foreign workers with either green cards or H-1B work visas more than 11,000 times from 2010 to 2019.

The American Society of Human Genetics (ASHG), the worlds largest genetics organization, is urging the White House to rescind their executive order as it will hinder the progress of science and better human health. They also point out the importance of connecting globally especially with the coronavirus crisis.

ASHG is deeply committed to a diverse and inclusive research workforce and honors those who come to U.S. labs from across the world to contribute to genetics and genomics advances in this country, said ASHG president Anthony Wynshaw-Boris, MD, PhD. Their experiences enrich American science and global science, and it is precisely Americas commitment to international collaboration that has made the U.S. a recognized global scientific leader. As the SARS-CoV-2 pandemic illustrates, we should be expanding global research connections that harness all minds to solve a problem, not closing our doors.

In a strongly worded statement, Kevin Wilson, director of public policy and media relations at the American Society for Cell Biology (ASCB), said the EO will hurt science in the United States. The decision by the Trump Administration to freeze through 2020 important U.S. visa programs that allow future scientists from around the world to come to the United States to learn is reprehensible. It goes against everything the United States stands for and violates the principle that scientific excellence requires collaboration, regardless of nationality.

The ASCB statement continued: It is American science and scientists who are the real victims of these policies. Without these talented individuals from around the globe, American biomedical research will not remain the world leader it is. If these policies are allowed to remain in place, the United States will no longer lead but will have to settle for the role of runner up.

H-1B visas are used for skilled workers and are common in the technology industry; H-4 visas are given to spouses of H-1B visa holders. H-2B visas apply to seasonal workers; L-1 visas are used for managers or executives transferring to the United States from positions abroad; and J-1 visas are given to scholars, researchers, and au pairs. The EO stops the issuance of all J-1s except for those going to physicians, medical researchers, or secondary school students. The order does not apply to immigrants already living and working in the United States nor to permanent residents seeking to become citizens.

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Scientists and Societies Decry Trump Executive Order on Immigration Visas - Genetic Engineering & Biotechnology News

- Full Data to be Presented at an Upcoming Medical Meeting -

Seattle Genetics, Inc. (Nasdaq:SGEN) today announced positive topline results from the phase 2 single-arm clinical trial known as innovaTV 204 evaluating tisotumab vedotin administered every three weeks for the treatment of patients who have relapsed or progressed on or after prior treatment for recurrent or metastatic cervical cancer. Results from the trial showed a 24 percent confirmed objective response rate (ORR) by independent central review [95% Confidence Interval: 15.9%-33.3%] with a median duration of response (DOR) of 8.3 months. The most common treatment-related adverse events (greater than or equal to 20 percent) included alopecia, epistaxis (nose bleeds), nausea, conjunctivitis, fatigue and dry eye. The data will be submitted for presentation at an upcoming medical meeting.

Tisotumab vedotin is an investigational antibody-drug conjugate (ADC) directed to tissue factor, which is expressed on cervical cancer and can promote tumor growth, angiogenesis and metastases.1 Standard therapies for previously treated recurrent and/or metastatic cervical cancer generally result in limited objective response rates of typically less than 15 percent with median overall survival ranging from 6.0 to 9.4 months, in an all-comers population.1-8 Tisotumab vedotin is being developed by Seattle Genetics in collaboration with Genmab.

"Available therapies upon progression after first line chemotherapy in recurrent or metastatic cervical cancer are limited, and there is a significant unmet need for new treatment options," said Roger Dansey, M.D., Chief Medical Officer at Seattle Genetics. "Tisotumab vedotin has demonstrated clinically meaningful and durable objective responses with a manageable safety profile, and we look forward to discussing with the FDA the potential submission of a Biologics License Application to support an accelerated approval."

Cervical cancer originates in the cells lining the cervix. Over 13,500 women are expected to be diagnosed with cervical cancer in the U.S. in 2020, with approximately 4,200 deaths.9 Cervical cancer remains one of the leading causes of cancer death in women globally, with over 311,000 women dying annually; the vast majority of these women being in the developing world.10 Routine medical examinations and the human papillomavirus (HPV) vaccine have lowered the incidence of cervical cancer in the developed world. Despite these advances, women are still diagnosed with cervical cancer, which often recurs or becomes metastatic.

Additional clinical trials of tisotumab vedotin are currently enrolling patients, including in combination with pembrolizumab, carboplatin or bevacizumab, and with a weekly dosing schedule in patients with locally advanced or metastatic cervical cancer. Tisotumab vedotin is also being evaluated in other tissue factor expressing tumor types, including ovarian and other solid tumors.

About innovaTV 204 Trial

The innovaTV 204 trial (also known as GCT1015-04 or innovaTV 204/GOG-3023/ENGOT-cx6) is an ongoing single-arm, global, multicenter study of tisotumab vedotin for patients with recurrent or metastatic cervical cancer who were previously treated with doublet chemotherapy with or without bevacizumab. Additionally, patients were eligible if they had received up to two prior lines of therapy in the metastatic setting. In the study, 101 patients were treated with tisotumab vedotin at multiple centers in the U.S. and Europe. The primary endpoint of the trial was confirmed objective response rate per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 as assessed by independent central review. Key secondary endpoints included duration of response, progression-free survival, overall survival, safety and tolerability.

The study was conducted in collaboration with European Network of Gynaecological Oncological Trial Groups (ENGOT) and Gynecologic Oncology Group (GOG). For more information about the phase 2 innovaTV 204 clinical trial and other clinical trials with tisotumab vedotin, please visit http://www.clinicaltrials.gov.

About Tisotumab Vedotin

Tisotumab vedotin is an investigational antibody-drug conjugate (ADC) composed of Genmabs fully human monoclonal antibody specific for tissue factor and Seattle Genetics ADC technology that utilizes a protease-cleavable linker that covalently attaches the microtubule-disrupting agent monomethyl auristatin E (MMAE) to the antibody and releases it upon internalization, inducing target cell death. In cancer biology, tissue factor is a protein that can promote tumor growth, angiogenesis and metastases.1 Based on its high expression on many solid tumors and its rapid internalization, tissue factor was selected as a target for an ADC approach. Tisotumab vedotin is being co-developed by Genmab and Seattle Genetics, under an agreement in which the companies share all costs and profits for the product on a 50:50 basis.

Story continues

Tisotumab vedotin is being evaluated in ongoing clinical trials as monotherapy in a range of solid tumors, including recurrent and/or metastatic cervical cancer, ovarian cancer and in combination with other commonly used therapies in recurrent or metastatic cervical cancer. These trials are evaluating tisotumab vedotin on a weekly or every three weeks dosing schedule.

About Seattle Genetics

Seattle Genetics, Inc. is a global biotechnology company that discovers, develops and commercializes transformative cancer medicines to make a meaningful difference in peoples lives. ADCETRIS (brentuximab vedotin) and PADCEVTM (enfortumab vedotin-ejfv) use the companys industry-leading antibody-drug conjugate (ADC) technology. ADCETRIS is approved in certain CD30-expressing lymphomas, and PADCEV is approved in certain metastatic urothelial cancers. TUKYSATM (tucatinib), a small molecule tyrosine kinase inhibitor, is approved in certain HER2-positive metastatic breast cancers. The company is headquartered in the Seattle, Washington area, with locations in California, Switzerland and the European Union. For more information on our robust pipeline, visit http://www.seattlegenetics.com and follow @SeattleGenetics on Twitter.

Forward Looking Statements

Certain of the statements made in this press release are forward looking, such as those, among others, relating to the potential submission of a BLA to the FDA under the FDAs accelerated approval program and the potential for regulatory approval of tisotumab vedotin based on the innovaTV 204 trial; the therapeutic potential of tisotumab vedotin, its possible benefits and uses, including as monotherapy or in combination with other agents, and in other tumor types or with a weekly dosing regimen, and the tisotumab vedotin future development program. Actual results or developments may differ materially from those projected or implied in these forward-looking statements. Factors that may cause such a difference include the possibility that the data from innovaTV 204 may not be sufficient to support accelerated approval; the possibility of impediments or delays in the submission of a potential BLA to the FDA; the risk of adverse events, including the potential for newly-emerging safety signals; delays, setbacks or failures in clinical development activities for a variety of reasons, including the difficulty and uncertainty of pharmaceutical product development, adverse regulatory action, possible required modifications to clinical trials, failure to properly conduct or manage clinical trials and failure of clinical results to support continued development or regulatory approvals. More information about the risks and uncertainties faced by Seattle Genetics is contained under the caption "Risk Factors" included in the companys Quarterly Report on Form 10-Q for the quarter ended March 31, 2020 filed with the Securities and Exchange Commission. Seattle Genetics disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

References:

1 Van de Berg YW et al. Blood 2012;119:924.2 Miller et al., Gynecol Oncol 2008; 110:65.3 Bookman et al., Gynecol Oncol 2000; 77:446.4 Garcia et al., Am J Clin Oncol 2007; 30:428.5 Monk et al., J Clin Oncol 2009; 27:1069.6 Santin et al., Gynecol Oncol 2011; 122:495.7 Schilder et al., Gynecol Oncol 2005; 96:1038 Chung HC et al. J Clin Oncol 2019; 37:1470.9 National Cancer Institute SEER. "Cancer Stat Facts: Cervix Uteri Cancer." Available at https://seer.cancer.gov/statfacts/html/cervix.html. Last accessed April 2020.10 Global Cancer Statistics 2018: GLOBOCAN Estimates of Incidence and Mortality Worldwide for 36 Cancers in 185 countries https://www.iarc.fr/news-events/global-cancer-statistics-2018-globocan-estimates-of-incidence-and-mortality-worldwide-for-36-cancers-in-185-countries/.

View source version on businesswire.com: https://www.businesswire.com/news/home/20200629005802/en/

Contacts

Seattle Genetics Media:Monique Greer, 425-527-4641mgreer@seagen.com

Investors:Peggy Pinkston, 425-527-4160ppinkston@seagen.com

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Seattle Genetics Announces Positive Topline Results from Phase 2 Clinical Trial of Tisotumab Vedotin in Recurrent or Metastatic Cervical Cancer -...

Tobacco smoke, UV radiation, and certain chemicals are some of the factors that can damage the genetic material of cells, triggering cancer. These factors modify individual letters in the DNA code, called nucleotides. When a cell divides, some of these errors or lesions are resolved by a mechanism called DNA repair, but others remain unrepaired and become permanent changes in the DNA, known as mutations. This can result in health problems, such as cancer. Such mutational processes are extremely complex and there are still many unanswered questions about how they work.

A new study led by the University of Cambridge and the University of Edinburgh, and supported by EMBL-EBI, has examined the evolution of tumours in mice following chemical damage. The research, published in the journal Nature, shows that DNA lesions caused by chemical damage are not eliminated immediately, but are passed on unrepaired through several rounds of cell division.

Lesion segregation

The researchers also found that, during cell division, the two DNA strands each with its own set of lesions and mutations, are separated into two daughter cells with different patterns of DNA changes. During further rounds of replication, the lesions repeatedly generate new combinations of mutations. This phenomenon, called lesion segregation, can result in extremely complex patterns of mutations in a tumours genome.

The researchers used the DNA-damaging chemical diethylnitrosamine to induce liver tumours in mice, and then analysed the tumour genomes.

Persistent DNA lesions induced by chemotherapeutic agents segregate and produce several generations of further mutations. We need to be aware of this therapeutically, and in future drug development," says Martin Taylor from the University of Edinburghs MRC Human Genetics Unit.

A model for mutational processes

These new insights into how mutational processes work are interesting and unexpected, says Paul Flicek, Associate Director of EMBL-EBI Services. The idea that DNA lesions are not resolved within a cell cycle and stay around for a long time is an important one. It shows that cells can evolve faster than the machinery can fix them and this has implications for how we think about cancer.

Image: Artist's impression of DNA lesions. Credit: Petra Korlevic

Find out more about the study:

Source articlesAITKEN, S.J., et al. (2020). Pervasive legion segregation shapes cancer genome evolution. Nature. Published online 24 06; DOI: 10.1038/s41586-020-2435-1

FundingThis project was supported by a strategic sequencing award and Institutional core funding from Cancer Research UK, as well as grants from the European Research Council, UKRI/Medical Research Council, and Wellcome.

Originally posted here:
Unpicking the complexity of DNA mutations - Cambridge Network

Published 30 June 2020

A radical new way of thinking about soil has finally solved the mystery of why adding organic material like manure improves flood and drought resilience, climate control and crop yields - universal ecosystem services that are widely recognised as worth billions to the global economy.

Founded on more than 50 years worth of data from a unique field experiment, researchers have demonstrated that common farming practices drain the soil of carbon, altering the structure of soils microscopic habitat and, remarkably, the genetics of microbes living within it.

The team of microbiologists and physicists, led by Rothamsted Research, considered almost 9,000 genes, and used X-ray imaging to look at soil pores smaller than the width of a human hair, and in concert with previous work, have started forming what they envisage will be a universal Theory of Soil (see Notes).

In healthy soils, relatively low nitrogen levels limit microbes ability to utilise carbon compounds, so they excrete them as polymers which act as a kind of glue - creating a porous, interconnected structure in the soil which allows water, air, and nutrients to circulate.

Writing in the journal Scientific Reports, the researchers reveal that the Victorian-era switch from manure to ammonia and phosphorous based fertilizers has caused microbes to metabolise more carbon, excrete less polymers and fundamentally alter the properties of farmland soils when compared to their original grassland state.

Lead researcher Professor Andrew Neal said: We noticed that as carbon is lost from soil, the pores within it become smaller and less connected.This results in fundamental changes in the flow of water, nutrients and oxygen through soil and forces several significant changes to microbial behaviour and metabolism. Low carbon, poorly connected soils are much less efficient at supporting growth and recycling nutrients.

A lack of oxygen in soil results in microbes having to turn to nitrogen and sulphur compounds for their energy-inefficient processes, he says, which result in increased emissions of the greenhouse gas nitrous oxide among other issues.

The closed soil structure also means microbes need to expend more energy on activities such as searching out and degrading less easily accessible organic matter for nutrients.

Conversely, in carbon-rich soil there is an extensive network of pores which allow for greater circulation of air, nutrients and retention of water.

Professor Neal added: Manure is high in carbon and nitrogen, whereas ammonia-based fertilisers are devoid of carbon. Decades of such inputs - and soil processes typically act over decades - have changed the way soil microbes get their energy and nutrients, and how they respire.

Whilst soil carbon was already known to drive climate and water cycles the world over, it took a chance discussion between experts working at very different scales to discover the reason why.

The idea to look at this link between the living and non-living components of soil came about through a discussion between an expert in microbial genetics Professor Andrew Neal, and Professor John Crawford now at the University of Glasgow - who studies the way complex systems behave.

Despite carbons critical role, the mechanisms underlying carbon dynamics and the link to soil water were poorly understood, said Professor Neal.Society struggles with the concept of what soil is and how it can be managed effectively because it is such a complex combination of biological, chemical and physical processes.

We took inspiration from a theory proposed by Richard Dawkins in the 1980s that many structures we encounter are in fact products of organisms genes Dawkins used the examples of bird nests and beaver dams.This view helped us understand soil as a product of microbial genes, incorporating organic materials from plants and other inputs to create all-important structure.

We have shown for the first time a dynamic interaction between soil structure and microbial activity - fuelled by carbon - which regulates water storage and gaseous flow rates in soil with real consequences for how microbes respire.

The group, which also involved scientists from the University of Nottingham, are the first to seriously study the details of this intimate two-way relationship between the microscopic life in soil and its structure at scales relevant to microbial processes.

The results also demonstrated why soils can sometimes show great resilience to human interventions.

Although years of intensive management practices have altered what compounds microbes predominantly live on and increased the frequency of genes that allow this lifestyle, very few genes are ever completely lost from the system. That crucially allows soils to respond to changes and these results can really help with any future remediation efforts, said Professor Neal.

Microbes are very good at acquiring genes from each other, which is why rather than look at different species we looked at the abundance of different genes and what functions they ultimately coded for.

The results also have implications for farmers, where the addition of nitrogen and phosphorous fertilizers - and not carbon - may in fact be leading to a degradation of the natural fertility and the efficiency with which nutrients are processed in their soils that will be detrimental to the long term productivity of their farm.

The negative impacts of increased leakiness of the soil system include nutrient loss to the atmosphere and rivers.

More here:
And finally... Where there's muck, there's brass - Scottish Construction Now

Researchers have discovered that Mediterranean populations may be more susceptible to an autoinflammatory disease because of evolutionary pressure to survive the bubonic plague. The study, carried out by scientists at the National Human Genome Research Institute (NHGRI), part of the National Institutes of Health, determined that specific genomic variants that cause a disease called familial Mediterranean fever (FMF) may also confer increased resilience to the plague.

The researchers suggest that because of this potential advantage, FMF-causing genomic variants have been positively selected for in Mediterranean populations over centuries. The findings were published in the journal Nature Immunology.

Over centuries, a biological arms race has been fought between humans and microbial pathogens. This evolutionary battle is between the human immune system and microorganisms trying to invade our bodies. Microbes affect the human genome in many ways. For example, they can influence some of the genomic variation that accumulates in human populations over time.

"In this era of a new pandemic, understanding the interplay between microbes and humans is ever critical," said Dr. Dan Kastner, NHGRI scientific director and a co-author on the paper. We can witness evolution playing out before our very eyes.

One such microbe is Yersinia pestis, the bacterial agent responsible for a series of well-documented bubonic plague(link is external) epidemics that led to over 50 million deaths.

FMF, like the plague, is an ancient disease. It is the most common periodic fever syndrome, and symptoms of FMF include recurrent fevers, arthritis, rashes and inflammation of the tissues that line the heart, lungs, and abdominal organs. FMF may also lead to renal failure and death without treatment. The disease appears across the Mediterranean region and mostly affects Turkish, Jewish, Armenian and Arab populations.

Genomic variants in the MEFV gene cause FMF. MEFV encodes a protein called pyrin. In healthy people, pyrin plays a role in the inflammatory response of the body. Pyrin is activated when there is an immune response (for example, in the event of an infection). Pyrin increases inflammation and the production of inflammation-related molecules.

In contrast, FMF patients produce abnormal pyrin because of genomic variants (mutations) in the MEFV gene. Mutated pyrin does not need an infection or other immune trigger to be activated; rather, it is able to directly predispose people to seemingly unprovoked episodes of fever and inflammation.

The MEFV mutations also have other usual properties. Researchers have discovered that people with only one copy of a MEFV genomic variant that causes FMF do not get the disease. Also, prior to effective treatment, those with two copies have high mortality rate by the age of 40, but usually live long enough to have children.

Despite the lower survival rate, almost 10% of Turks, Jews, Arabs and Armenians carry at least one copy of an FMF-causing genomic variant. If chance were the only factor, that percentage would be much lower.

The researchers proposed that this higher percentage was a consequence of positive natural selection, which is an evolutionary process that drives an increase in specific genomic variants and traits that are advantageous in some way.

"Just like sickle cell trait is positively selected for because it protects against malaria, we speculated that the mutant pyrin in FMF might be helping the Mediterranean population in some way," said Jae Jin Chae, Ph.D., senior author of the paper and a staff scientist in NHGRI's Metabolic, Cardiovascular and Inflammatory Disease Genomics Branch. "The mutant pyrin may be protecting them from some fatal infection."

The team turned to Yersinia pestis, the infamous bubonic plague-causing bacterium, as a possible candidate for driving the evolutionary selection for FMF mutations in the Mediterranean population.

It turns out Yersinia pestis contains a particular molecule that represses the function of pyrin in healthy individuals. In doing so, the pathogen suppresses the body's inflammatory response to the infection. This way, the body cannot fight back.

"Inflammation is a process in which white blood cells protect the body from infection. From the host's point of view, inflammation helps us survive. From the bacteria's point of view, inflammation is something to be evaded by any means available," said Daniel Shriner, Ph.D., staff scientist in the Center for Research on Genomics and Global Health at NHGRI.

Researchers were struck by the fact that Yersinia pestis affects the very protein that is mutated in FMF. They considered the possibility that FMF-causing genomic variants may protect individuals from the bubonic plague caused by Yersinia pestis.

The idea that evolution would push for one disease in a group to fight another may seem counterintuitive. But it comes down to what is the least bad option.

The average mortality rate of people with bubonic plague over centuries has been as high as 66%, while, even with a carrier frequency of 10%, less than 1% of the population has FMF. Theoretically, the evolutionary odds are in the latter's favor.

But first, the team had to verify if two of the genomic variants that cause FMF had indeed undergone positive selection in Mediterranean populations.

For this, they performed genetic analysis on a large cohort of 2,313 Turkish individuals. They also examined genomes from 352 ancient archaeological samples, including 261 from before the Christian era. The researchers tested for the presence of two FMF-causing genomic variants in both groups of samples. They also used population genetics principles and mathematical modeling to predict how the frequency of FMF-causing genomic variants changed over generations.

"We found that both FMF-causing genomic variants arose more than 2,000 years ago, before the Justinian Plague and the Black Death. Both variants were associated with evidence of positive selection," said Elaine Remmers, Ph.D., associate investigator in NHGRI's Metabolic, Cardiovascular and Inflammatory Disease Genomics Branch.

Researchers then studied how Yersinia pestis interacts with FMF-causing genomic variants. They took samples of particular white blood cells from FMF patients. In addition, they took samples from people who carry just one copy of the genomic variants (hence, do not get the disease).

The team found that Yersinia pestis does not reduce inflammation in white blood cells acquired from FMF patients and people with one copy of FMF-causing genomic variants. This finding is in stark contrast to the fact that Yersinia pestis reduces inflammation in cells without FMF-associated mutations.

The researchers thought that if Yersinia pestis does not reduce inflammation in people with FMF, then perhaps this could potentially increase patients' survival rate when infected by the pathogen.

To test this hypothesis, the researchers genetically engineered mice with FMF-causing genomic variants. They infected both healthy and genetically engineered mice with Yersinia pestis. Their results showed that infected mice with the FMF-causing genomic variant had significantly increased survival as compared to infected healthy mice.

These findings, in combination, indicate that over centuries, FMF-causing genomic variants positively selected in Turkish populations play a role in providing resistance to Yersinia pestis infection. Whether the same is true for other Mediterranean populations remains to be seen. The study offers a glimpse into the unexpected and long-lasting influence of microbes on human biology.

ReferencePark, Y.H., Remmers, E.F., Lee, W. et al. Ancient familial Mediterranean fever mutations in human pyrin and resistance to Yersinia pestis. Nat Immunol (2020). https://doi.org/10.1038/s41590-020-0705-6.

This article has been republished from the following materials. Note: material may have been edited for length and content. For further information, please contact the cited source.

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Cause of Common Autoinflammatory Disease May Have Protected Ancestors From Plague - Technology Networks