Plasma cell dyscrasias encompass a spectrum from the precursors monoclonal gammopathy of undetermined significance and smoldering myeloma to symptomatic myeloma, but the genes that enable progression and confer poor prognosis are incompletely understood. Using single cell transcriptomics, we identified the Caseinolytic protease proteolytic subunit (CLPP), a key component of the mitochondrial CLP serine endopeptidase, as being over-expressed in CD138+ neoplastic versus normal, and in …