MRI1 (methylthioribose-1-phosphate isomerase 1) is an enzyme that catalyzes the interconversion of methylthioribose-1-phosphate (MTR-1-P) into methylthioribulose-1-phosphate (MTRu-1-P), functioning within the L-methionine cycle. Beyond its catalytic role, MRI1 possesses non-catalytic functions in cell biology, promoting cell invasion through FAK tyrosine phosphorylation and stress fiber turnover in response to constitutive RhoA activation. The gene localizes to both the cytosol and nucleoplasm, where it engages in protein binding interactions. Disease relevance emerged from epigenomic analysis showing statistically significant differential methylation at the MRI1 gene promoter region in subjects with severe asthma compared to normal controls (p < 10⁻⁸) 1. Specifically, MRI1 methylation status was among three gene promoter regions that remained statistically different after multiple testing correction between severe asthma patients and healthy controls 1. This finding suggests MRI1 may play a role in asthma pathogenesis through epigenetic mechanisms, though the functional significance of altered MRI1 methylation in disease requires further investigation. The clinical implications remain to be fully elucidated, as the study involved a small sample size warranting expanded research into MRI1's contribution to severe asthma development and progression.