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Cohesin mediates sister chromatid cohesion and 3D genome folding. Two versions of the complex carrying STAG1 or STAG2 coexist in somatic vertebrate cells. STAG2 is commonly mutated in cancer, and germline mutations have been identified in cohesinopathy patients. To better understand the underlying pathogenic mechanisms, we report the consequences of Stag2 ablation in mice. STAG2 is largely dispensable in adults, and its tissue-wide inactivation does not lead to tumors but reduces fitness and affects both hematopoiesis and intestinal homeos