In the same nucleotide position of PLN two more variants, c.26G>T, p. Arg9Leu and c.26G>A, p. Arg9His, have been identified, in heterozygosity, following mutation screening of Polish, Brazilian and Portuguese DCM patient cohorts (Medeiros et al., 2011; Truszkowska et al., 2015; Sousa et al., 2019). The gene discussed is PLN; the disease is familial dilated cardiomyopathy.