<i>RMND1</i> Mutation Case Report and Literature Review

Abstract

<b><i>Introduction:</i></b> Mutations in the RMND1 gene that cause defects in the mitochondrial respiratory chain result in a highly variable phenotypic presentation. The protein required for meiotic nuclear division 1 homolog (RMND1) is localized to the inner mitochondrial membrane and is encoded by the nuclear genome. <b><i>Case Presentation:</i></b> We report a new patient from a consanguineous family who was severely affected by a previously described combined oxidative phosphorylation deficiency 11 and was treated rapidly due to early diagnosis. <b><i>Methods:</i></b> We also included patients with RMND1 mutation in the literature. We analyzed the epidemiological, clinical, laboratory, and genetic data of a total of 49 patients (98 alleles) in the literature, including our patient. We summarized all previously published patients and focused on the importance of early diagnosis. <b><i>Results:</i></b> The most common variant in patients with RMND1 mutation was c.713A&gt;G (p.Asn238Ser). Mortality was significantly lower in patients with homozygous and compound heterozygous c.713A&gt;G (p.Asn238Ser) mutations (<i>p</i> &lt; 0.001). The second most common mutation was c1349G&gt;C (p.*450Serext*31), which was reported in 11 patients (22.4%). Cardiac involvement and mortality were more common in patients with homozygous c.1349G&gt;C (p.*450Serext*32) mutation (<i>p</i> = 0.008 and 0.008, respectively). <b><i>Conclusion:</i></b> In this study, the effect of cardiac involvement on mortality in RMND1 mutation was shown for the first time. We reported that mortality was lower in the c.713A&gt;G (p.Asn238Ser) mutation. Furthermore, mortality was more common in the c.1349G&gt;C (p.*450Serext*32) mutation. These findings have not been previously reported in the literature. They are reported for the first time in this study.