Genetics

This post covers Martin-Gutierrez and colleagues' 2024 study in Clinical and Experimental Immunology on lipid metabolism in CD4 T cells from treatment-naive relapsing-remitting MS patients. Its centre is a paradox: LXR-beta is upregulated nearly threefold while 40 of 66 LXR target genes are downregulated and the classic targets ABCA1 and ABCG1 do not move. The post covers the membrane lipid changes and the inverted glycosphingolipid-cholesterol correlation, their absence in secondary progressive disease, the serum and TCR experiments separating the two drivers, why the LXR agonist rescue corrects cholesterol but not glycosphingolipids or membrane order, the UGCG link to brain tissue, and the sixteen-year age gap between sequencing groups that the authors address at length.