GEOapplication/xmlftp://ftp.ncbi.nlm.nih.gov/geo/series/GSE329nnn/GSE329070/primaryOK200TranscriptomicsHomo sapiensExpression profiling by high throughput sequencinghttps://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE329070GEOGSEfalseTCF7L2 Promotes Abdominal Aortic Aneurysm through Smooth Muscle Cell-Mediated Extracellular Matrix Remodeling [RNA-seq]Abdominal aortic aneurysm (AAA) lacks effective pharmacological therapies. Here, we investigate transcription factor 7-like 2 (TCF7L2), a genetic locus associated with both thoracic and abdominal aortic aneurysms, to elucidate its role in AAA pathogenesis. Integrating summary-data-based Mendelian randomization (SMR) with single-cell RNA sequencing (scRNA-seq) of human and mouse aortas, we identify TCF7L2 as a gene enriched in vascular smooth muscle cells (VSMCs) and causally linked to AAA development. Smooth muscle cell-specific TCF7L2 knockout significantly attenuates AAA formation across three distinct murine models (Ang II infusion-, BAPN/Ang II co-administration-, and elastase-induced AAA), independent of systemic blood pressure or lipid levels. Mechanistic studies reveal that TCF7L2 directly upregulates MMP14 and downregulates TIMP3 expression, driving MMP2-mediated extracellular matrix (ECM) degradation. Concurrently, TCF7L2 represses integrin β1 (ITGB1) expression, reducing VSMC adhesion to the ECM. Collectively, these findings identify TCF7L2 as a key driver of pathological vascular remodeling in AAA, suggesting that targeting TCF7L2 may offer a novel therapeutic strategy for limiting AAA progression.2026/04/25GSE329070GSM9696626GSM9696632GSM9696633GSM9696630GSM9696631GSM9696629GSM9696627GSM969662824676329070Homo sapiens