Autoimmune Diseases in Women Linked to Gene Regulation

Key Points

• Researchers identified more than 1,000 sex-specific genetic switches influencing immune activity.
• Women showed stronger inflammatory immune responses linked to the risk of autoimmune diseases.
• The study may explain why lupus affects women far more often than men.
• Findings support sex-specific precision medicine approaches in autoimmune care.
• Single-cell sequencing revealed immune differences previously missed in bulk blood studies.

Why Are Women More Prone to Autoimmune Diseases?

A new study on the risk of autoimmune diseases in women has identified genetic mechanisms that may explain why conditions such as lupus affect females more often than males. Researchers from the Garvan Institute of Medical Research and UNSW Sydney discovered more than 1,000 genetic switches that function differently in male and female immune cells, increasing inflammatory immune activity in women.

Published in The American Journal of Human Genetics, the study analyzed over 1.25 million immune cells from nearly 1,000 healthy participants using advanced single-cell sequencing technology. Researchers found that women had higher levels of B cells and regulatory T cells linked to stronger inflammatory responses, while men showed greater activity in cellular maintenance pathways.

Although this heightened immune vigilance may improve protection against viral infections, researchers say it may also increase the risk of autoimmune diseases such as systemic lupus erythematosus.

How Genetic Switches Influence Lupus and Inflammatory Pathways

One of the most significant findings involved sex-specific genetic regulators known as expression quantitative trait loci (eQTLs). These genetic switches control how strongly genes are turned on or off inside immune cells.

Contrary to previous assumptions, most sex-biased immune variations were not located on the X or Y chromosomes. Instead, researchers found that the majority existed on autosomes — chromosomes shared by both sexes.

Importantly, several of these genetic variants were directly associated with female-biased expression of lupus-related genes. Investigators believe these findings offer new biological insight into why lupus occurs up to nine times more frequently in women.

Dr. Sara Ballouz of UNSW Sydney explained that female immune systems appear biologically primed toward inflammatory pathways. While this enhances pathogen defense, it may also increase susceptibility to chronic immune dysregulation and tissue damage.

Precision Medicine May Improve Treatment of Autoimmune Diseases

The study raises concerns about one-size-fits-all treatment approaches in autoimmune care. Most current therapies broadly suppress the immune system instead of targeting the specific biological pathways that differ between men and women. Researchers believe that understanding these genetic immune differences could help clinicians develop more personalized treatments for lupus and other autoimmune diseases.

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The findings also highlight the need for sex-aware clinical research and precision medicine strategies. For rheumatologists, immunologists, nurses, and other healthcare professionals, the study provides important insight into how male and female immune systems function differently at a genetic level, which may influence future therapeutic development.

Source:

Garvan Institute of Medical Research