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“Explosive” Cell Death – Scientists Discover Genetic Trigger in 3% of Global Population

October 4, 2023
in Science
“Explosive” Cell Death – Scientists Discover Genetic Trigger in 3% of Global Population
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Cell Death Illustration

Researchers have identified a genetic change in the MLKL gene, carried by 3% of the global population, that intensifies ‘explosive’ cell death, potentially increasing the risk of inflammatory diseases and severe bacterial infection reactions. This discovery may pave the way for improved personalized treatments and insights into individual inflammatory responses.

Researchers from WEHI in Australia have discovered a genetic variation present in up to 3% of the global population that heightens the risk of inflammation through a mechanism termed ‘explosive’ cell death.

This study might shed light on why certain individuals have a higher likelihood to develop ailments such as inflammatory bowel disease or experience intensified reactions to bacterial infections like Salmonella.

Immune power of ‘explosive’ cell death

Every minute, millions of cells in our bodies die on purpose. Cell death is an essential process that protects our bodies from disease by removing unwanted, damaged or dangerous cells, and preventing the spread of viruses, bacteria, and even cancer.

WEHI’s Dr Sarah Garnish is first author on the paper and said that while there are various types of cell death, necroptosis is distinguished by its ferocity – the cells essentially explode, which sounds an alarm for other cells in the body to respond.

Cells Dying by Necroptosis

Cells dying by necroptosis, an inflammatory form of cell death which is driven by the protein MLKL. Credit: WEHI

“This is a good thing in the case of a viral infection, where necroptosis not only kills the infected cells but instructs the immune system to respond, clean things up, and start a more specific, long lived immune response,” Dr Garnish said. “But when necroptosis is uncontrolled or excessive, the inflammatory response can actually trigger disease.”

Genetic brakes

The gatekeeper of necroptosis is the gene MLKL. When the body needs to trigger a cell death response with plenty of firepower, the cellular brakes that normally keep MLKL in-check are released. However, some of us make a form of MLKL with flimsy brakes.

Dr Garnish and her co-authors have been able to quantify this at a population level for the first time.

“For most of us, MLKL will stop when the body tells it to stop, but 2–3% of people have a form of MLKL that is less responsive to stop signals,” Dr Garnish said. “While 2-3% doesn’t seem like much, when you consider the global population, this adds up to many millions of people carrying a copy of this gene variant.”

Project leader Dr Joanne Hildebrand said the research proposes that a common genetic change like this can combine with a person’s lifestyle, infection history and broader genetic makeup to increase the risk of inflammatory diseases and severe reactions to infections. This is known as polygenic risk – the combined influence of multiple genes on developing a certain trait or condition.

Joanne Hildebrand and Sarah Garnish

L-R: Project leader Dr Joanne Hildebrand and first author Dr Sarah Garnish. Credit: WEHI

“Taking Type 2 diabetes as an example, it’s rare that just one gene change determines whether someone will develop the condition,” Dr Hildebrand said. “Instead many different genes play a role, as do environmental factors, like diet and smoking.”

Dr Hildebrand said it’s not as simple as directly connecting this difference in the MLKL gene with the chance of someone developing a specific condition.

“We haven’t tagged this MLKL gene variant to any one particular disease yet, but we see real potential for it to combine with other gene variants, and other environmental cues, to influence the intensity of our inflammatory response.”

Towards personalized medicine

Our understanding of MLKL has come a long way since it surfaced by chance in a WEHI lab more than 20 years ago. Today’s research opens the door for future tests and screening to determine disease risks.

Genome sequencing is becoming cheaper and more readily accessible. As more genomic data becomes available to researchers, it increases the likelihood that they can link common genetic variants, like the one described for MLKL, with disease.

In the future researchers hope to pinpoint the genetic changes that might mean someone is more likely to have a severe case of COVID-19, or less likely to bounce back after chemotherapy.

“Every piece of information like this helps us make personalised medicine more of a reality,” said Dr Garnish.

The WEHI team is also investigating whether uncontrolled necroptosis could be beneficial in some circumstances. For example, could people with the MLKL gene variant have a stronger cellular defensive response to certain viruses?

“Gene changes like this don’t usually accumulate in the population over time unless there is a reason for it – they generally get passed on because they do something good,” said Dr Garnish. “We’re looking at the downsides of having this gene change, but we’re looking for the upsides as well.”

Reference: “A common human MLKL polymorphism confers resistance to negative regulation by phosphorylation” by Sarah E. Garnish, Katherine R. Martin, Maria Kauppi, Victoria E. Jackson, Rebecca Ambrose, Vik Ven Eng, Shene Chiou, Yanxiang Meng, Daniel Frank, Emma C. Tovey Crutchfield, Komal M. Patel, Annette V. Jacobsen, Georgia K. Atkin-Smith, Ladina Di Rago, Marcel Doerflinger, Christopher R. Horne, Cathrine Hall, Samuel N. Young, Matthew Cook, Vicki Athanasopoulos, Carola G. Vinuesa, Kate E. Lawlor, Ian P. Wicks, Gregor Ebert, Ashley P. Ng, Charlotte A. Slade, Jaclyn S. Pearson, André L. Samson, John Silke, James M. Murphy and Joanne M. Hildebrand, 28 September 2023, Nature Communications.
DOI: 10.1038/s41467-023-41724-6

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/explosive-cell-death-scientists-discover-genetic-trigger-in-3-of-global-population/

Tags: deathExplosivescience
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