Largest-Ever Genetic Study of Fibromyalgia Points to a Neurological Origin

Researchers at the Salk Institute recently unveiled a significant milestone in genetic mapping. They created the first body-wide single-cell atlas that simultaneously captures DNA methylation and 3D genome folding. This dual-layer approach allows scientists to see how cells regulate their identity and function across 16 different human tissues.

Understanding how the genome is organized is essential for identifying how genetic variants lead to disease. Most variants that cause illness exist in non-coding regions of the genome. By mapping these regions to specific cell types, the team successfully linked blood-glucose variants to endocrine cells and identified specific connections between variants and conditions like bipolar disorder and schizophrenia in neurons.

One of the most notable discoveries involves the role of non-CG methylation. Previously thought to be restricted to neurons and stem cells, the team found that this type of methylation exists in tissues like muscle and the pancreas. This suggests that non-CG methylation acts as a broader, yet subtler, component of the body's regulatory system than researchers originally assumed.

The research also sheds light on how cells shift their states. By observing mismatches between DNA methylation and 3D genome structure, the scientists found that 3D genomic architecture often updates to a new state before methylation patterns follow suit. This finding provides a way to flag cells as they switch states, which could be critical for tracking disease progression.

This open-access resource serves as a foundation for future studies, particularly those focused on how aging and disease affect the body over time. The data is available for use in training algorithms to predict the impact of genetic variants on health. Future efforts will look at the fourth dimension of this data: how these structures change as we age and respond to environmental factors.