Multiple Sclerosis

HLA-DRB1*15:01 is the single strongest genetic risk factor for multiple sclerosis, but exactly how it shapes the brain's immune environment is unclear. Researchers used mice engineered to carry the human version of this gene and followed them at 6, 9 and 15 months, comparing males and females. The gene altered how microglia, the brain's resident immune cells, behaved, and the effects differed with age and sex. That may help explain why MS affects women more often than men.

MS is a polygenic disease, many genes each add a small amount of risk, and researchers want to know which ones shape how severe it becomes. In 548 untreated Russian patients, this study tested 35 variants in immune-system genes against a standard MS severity score. Variants in several genes (including CCR5 and the major risk gene HLA-DRB1) were linked to severity. Findings like these move toward genetic tools that could one day help predict an individual's likely disease course.

Multiple sclerosis risk is shaped by both genes and environment, and treatments that work well for one person may not for another. This review pulls together what's known about the genetics of MS, more than 200 risk regions in the genome, with the HLA-DRB1*15:01 immune gene the strongest, alongside epigenetic changes (chemical marks that switch genes on or off) and environmental triggers like Epstein-Barr virus. The goal is more personalized MS care, using a person's genetic and molecular profile to guide which disease-modifying therapy is most likely to help.

Adult onset genetic white matter diseases are often mistaken for multiple sclerosis because they look similar on scans. The White Matter Rounds Network, clinicians from more than 15 centers who meet monthly to discuss undiagnosed cases, surveyed what MRI protocols centers actually use and found little consistency. Using a structured expert process, they propose a core standard scan protocol. Consistent imaging makes it more likely that an inherited leukodystrophy is recognized rather than treated for years as MS.

The choroid plexus, a structure that makes spinal fluid, enlarges early in MS. Studying 727 patients and 461 healthy people, researchers modeled how its size changes across the lifespan and linked enlargement to clinical features, MRI findings, and genetic risk, including HLA and broader polygenic risk scores. Tying a measurable brain structure to inherited MS risk could yield new ways to identify higher-risk patients and understand how genetic susceptibility plays out in the brain.

In multiple sclerosis the immune system attacks the brain, but exactly what it targets has been hard to pin down. This study focused on people who carry HLA-DR15, the immune-gene variant most strongly tied to MS risk, and searched for pieces of a protein called RASGRP2 that their immune cells recognize. Identifying such gene-linked targets is a step toward "tolerising" therapies designed to calm the specific immune response in genetically susceptible patients, a more precise alternative to broadly suppressing immunity.

Why multiple sclerosis progresses faster in some people than others may partly reflect their genes. Researchers genotyped 845 MS patients (relapsing-remitting and progressive) for variants in genes that defend cells against oxidative stress and a form of cell death called ferroptosis, both linked to nerve damage in MS. By testing whether these variants track with the progressive form of the disease, the study looks for inherited factors that influence severity, which could eventually help identify who is at greater risk of worsening.

Genome studies have found hundreds of DNA regions that raise multiple sclerosis risk, but not how they actually cause disease. This review explains how scientists are connecting those risk variants to biology, especially by mapping which variants change how genes are switched on in specific immune cells, and how genetic and environmental risks (like Epstein-Barr virus) may converge on shared pathways. Turning a list of risk genes into real mechanisms is essential for designing treatments that target the roots of MS rather than only its symptoms.

Multiple sclerosis and type 1 diabetes are both autoimmune diseases and sometimes occur in the same person or family, hinting at shared genetic roots. Using large genetic datasets (nearly 15,000 MS patients and many more for diabetes), researchers looked for DNA regions that influence both conditions and identified 26 shared signals. Understanding this common "autoimmunity" genetics helps explain why these diseases cluster together and could point to treatments or prevention strategies that work across more than one autoimmune condition.

The immune signaling molecules IL-18 and IL-8 help drive the inflammation seen in multiple sclerosis, and small inherited differences in their genes might affect who develops MS and how active it is. This study compared 98 people with relapsing-remitting MS to 98 healthy volunteers, looking at variations in these two genes and relating them to disease susceptibility, disability scores, and MRI activity. Findings like these add to the picture of how a person's immune-gene makeup shapes their individual course of MS.

Why do genes that raise MS risk persist, and why is MS more common in northern Europe? This review examines two ideas in light of ancient-DNA research. One holds that MS risk variants survived because they once strengthened defenses against infection; the other, that modern low exposure to ancient microbes leaves the immune system prone to overreacting. Recent findings tie higher MS genetic risk to ancestry from Bronze Age Steppe peoples who evolved strong inflammatory immune responses. It is an accessible look at the deep history behind today's genetic risk.

Two decades of large genetic studies have reshaped how doctors understand multiple sclerosis. This review explains that MS risk is highly polygenic, spread across more than 200 regions of the genome, with the immune gene HLA-DRB1*15:01 remaining the single strongest and most reproducible risk factor. Beyond that, many other immune-related genes contribute, and rarer variants in genes such as PRF1, CYP27B1, and NLRP1 are emerging from family-based studies. The authors stress the need to study people of diverse ancestries to understand MS risk fully.

Scientists have long known that many small genetic differences add up to influence who develops multiple sclerosis. This expert review summarizes where the field stands now: beyond the well-mapped genes that shape susceptibility (mostly immune-related), researchers have found the first genetic signal tied to how fast MS progresses (the DYSF-ZNF638 region), which points to processes inside the brain and spinal cord rather than the immune system. It also highlights how host genes and the Epstein-Barr virus interact, reframing how MS may begin.

Most MS genetics research has focused on people of European descent, leaving gaps for other populations. This UK study genotyped people with MS of South Asian and African ancestry and compared them with large control groups. It found that variation in the immune HLA region drives MS risk across all ancestries, and that many European-defined risk variants also raise risk in South Asian and African groups, though not identically. Work like this helps ensure future genetic tests and treatments serve everyone, not only patients of European ancestry.

Multiple sclerosis rarely has a single cause. This review pulls together the main threads: more than 200 genetic variants (led by the immune gene HLA-DRB1*15:01) create susceptibility, while Epstein-Barr virus infection appears to be the key trigger, cytomegalovirus may be protective, and smoking, adolescent obesity, low vitamin D, and gut-bacteria imbalance further shift risk. Crucially, several of these exposures interact with the HLA risk gene, amplifying danger beyond what each would do alone. The picture helps families understand why MS emerges from many factors together.

When MS runs in families, is it the same factors that make the disease more severe? This Dutch study followed people after a first MS-like episode and measured genetic risk scores, the HLA-DRB1*15:01 variant, vitamin D, body-mass index, and Epstein-Barr virus antibodies. People reporting a family history of MS carried higher genetic susceptibility and more often had the HLA risk variant, but their early disease severity was similar. The findings suggest inherited factors shape who develops MS more than how aggressive it is early on.

This Chinese study looked not at DNA sequence alone but at DNA methylation, chemical tags that switch genes on or off. Comparing blood samples from people with MS and healthy controls, the researchers scanned for methylation patterns linked to the disease and pinpointed several, mapping the strongest signals to the immune genes HLA-DQA1 and HLA-DRB5. Because methylation can be shaped by the environment, findings like these help explain how outside factors may act on MS risk genes, and could eventually contribute to earlier or more precise diagnosis.