Nathalie Vadrot, Flavie Ader, Maryline Moulin, Marie Merlant, Françoise Chapon, Estelle Gandjbakhch, Fabien Labombarda, Pascale Maragnes, Patricia Réant, Caroline Rooryck, Vincent Probst, Erwan Donal, Pascale Richard, Ana Ferreiro, Brigitte Buendia
A single missense variant of the TMPO /LAP2α gene, encoding LAP2 proteins, has been associated with cardiomyopathy in two brothers. To further evaluate its role in cardiac muscle, we included TMPO in our cardiomyopathy diagnostic gene panel. A screening of ~5000 patients revealed three novel rare TMPO heterozygous variants in six males diagnosed with hypertrophic or dilated cardiomypathy. We identified in different cellular models that (1) the frameshift variant LAP2α p.(Gly395Glufs*11) induced haploinsufficiency, impeding cell proliferation and/or producing a truncated protein mislocalized in the cytoplasm; (2) the C-ter missense variant LAP2α p...
January 16, 2023: Cells