Locus-Scale Massively Parallel Reporter Assays

Abstract

Interactions among cis -regulatory elements (CREs) are central to mammalian gene regulation. Long @$$ massively parallel reporter assays (LAMPRAs) integrate combinatorial cloning, molecular barcoding and long- and short-read sequencing, to scalably measure how CRE identities, numbers, spacings, orders, orientations, and interactions shape regulatory output at multi-kilobase length scales. As a proof-of-concept, we assay 36,000 x 5-kb synthetic cis -regulatory loci (sCRLs), each a 5 x 1-kb random combination of enhancers, insulators and spacers, to model how locus composition drives gene expression.