Women are affected by autoimmune conditions at dramatically higher rates than men and research is revealing that a molecule produced by one of women’s two X chromosomes is part of the reason why.
In America it is estimated that of the 24–50 million Americans living with autoimmunity, as many as 80% are women. Diseases such as rheumatoid arthritis, multiple sclerosis, scleroderma, lupus (which has a 9:1 female-to-male ratio), and Sjögren’s syndrome (a 19:1 female-to-male ratio) show a striking sex bias.
In the Stanford research, reported in 2024, part of this disparity was traced to X-chromosome inactivation — a fundamental biological process unique to females. Because females possess two X chromosomes (XX) and males one X and one Y (XY), female cells in the embryo must close down one X to prevent a harmful double dose of X-linked gene expression. This is facilitated by Xist, a molecule that coats one X chromosome and silences it.
While Xist equalises the gene dosage, it also forms large protein molecular complexes. Nearly 100 proteins have been identified that bind to Xist with many already implicated in autoimmune pathways. The new study demonstrated that these complexes can become targets of the immune system.
Furthermore, when male mice were genetically engineered to produce Xist (without silencing their X chromosome), they developed lupus-like disease at rates approaching females — but only when exposed to tissue stress via a chemical irritant. Xist alone was insufficient to trigger disease and importantly this indicates the requirement for additional factors, or an even higher incidence for women would be expected.
Genetic Susceptibility
Autoimmunity is not a direct result of Xist activity. The research shows that genetic background is also important. Particular gene variations increase susceptibility to diseases like lupus and rheumatoid arthritis. Xist is thought to be an amplifying factor within an already susceptible genetic background rather than as a sole cause. It is important to look at family history but even this is not the full story.
Tissue Stress and Environmental Triggers
The experiments on mice also highlighted the necessity of the presence of tissue damage or inflammatory stress. Environmental triggers such as infections, ultraviolet radiation, smoking, hormonal shifts, or chemical exposures; repeatable everyday type of exposures — can release molecules combining with Xist-associated complexes, promoting autoantibody formation.
The Stanford team found that even in genetically susceptible mice, autoimmunity required an irritant to initiate disease. Conversely, mice with resistant genetic backgrounds did not develop autoimmunity even when Xist was activated.
The challenge with tissue damage or inflammatory stress is that it occurs from a wide range of common sources or life events. Beyond the environmental triggers listed above, when people living with a diagnosed autoimmune condition were surveyed, 80% of patients reported that their symptoms first appeared after a period of extreme stress. This type of high stress, sometimes over extended periods is typically associated with the common experiences of loss of loved ones, being a carer, moving house, divorce and work stress. In some cases, these events are experienced simultaneously and/or over extended periods and that is more problematic.
It is useful to think of a multi-factor model for autoimmunity, where all three factors play a role…
(1) genetic predisposition
(2) Xist-associated immune targets
(3) tissue stress/inflammatory triggers/chronic stress
Toward Improved Recognition
What can be done to identify risks? Improved screening is a strong possibility. Blood samples from patients with autoimmune disease reveal the presence of antibodies, either disease-specific, or known to be present in multiple condition antibodies, suggesting that these antibodies can be used as early biomarkers and to improve predictive screening.
More research will help but an issue with understanding autoimmunity more fully is that laboratory testing may not be looking at female samples as male reference samples may be used or the norm and will not display Xist expression. This will under-recognise female-specific immune targets.
Because the understanding around Xist and autoimmune condition factors is relatively recent, it is important to improve information being provided about autoimmune conditions. Women health issues are often underrepresented in research studies and this could be changed. Difficult to measure conditions affecting women historically had to meet higher thresholds of symptoms for diagnosis or were slow to be diagnosed and these patterns could be improved.
Updating information informs medical professionals but also informs anyone affected by an autoimmune condition or has someone close to them that is affected.
It is now possible, if there is a will, to research predictive screening, examine genetic susceptibility and provide far more information on the factors around stress and inflammatory triggers.
With autoimmune conditions on the rise globally, estimates suggest that between 5–10% of the population will experience an autoimmune disorder at some point in their lives and it is important for health services to consider how to manage that.
Given the multifactorial nature of autoimmune disease, it is crucial to closely examine risk factors and provide practical information on managing stress. Understanding the interplay between genetic predisposition, environmental triggers, and tissue stress can empower individuals to make informed choices regarding their health. Stress management strategies, such as yoga, can be beneficial in alleviating some of the physical and psychological burdens associated with autoimmune conditions.
However, it is important to recognise that while yoga and similar practices may help individuals, they are not a cure-all. Structural societal factors—such as socioeconomic inequality, workplace demands, or limited access to healthcare—can significantly compound stress. Personal circumstances, including family responsibilities, challenging life events or chronic illness, may further exacerbate vulnerability. Thus, comprehensive support and education should address not only individual strategies but also the wider context in which stress occurs, promoting holistic approaches to prevention and care.
Managing Health on a Personal Level
On a personal level, yoga therapy offers individuals with autoimmune conditions a tailored approach to managing their health. By engaging in regular yoga practice, people can cultivate a greater sense of positive self-awareness, enabling them to recognise stressors and adopt effective self-management techniques. Personalised yoga therapy sessions will review what an individual currently experiences in their health and will typically use movement, breathwork and other suitable practices, designed to help that individual manage their stress, which is critical in controlling autoimmune flare-ups.
In addition, yoga provides a structured framework for building inner resilience, offering a supportive self-structure that individuals can draw upon. Development of awareness and self-reflection encourages exploration of lifestyle choices that support health, such as sleep patterns, nutrition, work and rest, balanced daily routines and emotional stress. This holistic approach empowers individuals to make confident choices, fostering both physical and psychological stability while navigating the complexities of life with an autoimmune condition. Ultimately, prioritising stress management through yoga not only alleviates some of the burdens associated with autoimmune diseases but also encourages a positive, proactive and compassionate approach to long-term self-care.