PuSH - Publikationsserver des Helmholtz Zentrums München: Digenic Leigh syndrome on the background of the m.11778G>A Leber hereditary optic neuropathy variant.

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Blickhaeuser, B. ; Stenton, S.L.* ; Neuhofer, C. ; Floride, E.* ; Nesbitt, V.* ; Fratter, C.* ; Koch, J.* ; Kauffmann, B.* ; Catarino, C.* ; Schlieben, L.D. ; Kopajtich, R. ; Carelli, V.* ; Sadun, A.A.* ; McFarland, R.* ; Fang, F.* ; La Morgia, C.* ; Paquay, S.* ; Nassogne, M.C.* ; Ghezzi, D.* ; Lamperti, C.* ; Wortmann, S.* ; Poulton, J.* ; Klopstock, T.* ; Prokisch, H.

Digenic Leigh syndrome on the background of the m.11778G>A Leber hereditary optic neuropathy variant.

Brain 147, 1967-1974 (2024)

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Leigh syndrome spectrum (LSS) is a primary mitochondrial disorder defined neuropathologically by a subacute necrotizing encephalomyelopathy and characterised by bilateral basal ganglia and/or brainstem lesions. LSS is associated with variants in several mitochondrial DNA (mtDNA) genes and more than 100 nuclear genes, most often related to mitochondrial complex I (CI) dysfunction. Rarely, LSS has been reported in association with primary Leber hereditary optic neuropathy (LHON) variants of the mtDNA, coding for CI subunits (m.3460G>A in MT-ND1, m.11778G>A in MT-ND4, and m.14484T>C in MT-ND6). The underlying mechanism by which these variants manifest as LSS, a severe neurodegenerative disease, as opposed to the LHON phenotype of isolated optic neuropathy, remains an open question. Here, we analyse the exome sequencing of six probands with LSS carrying primary LHON variants, and report digenic co-occurrence of the m.11778G>A variant with damaging heterozygous variants in nuclear disease genes encoding CI subunits as a plausible explanation. Our findings suggest a digenic mechanism of disease for m.11778G>A-associated LSS, consistent with recent reports of digenic disease in individuals manifesting with LSS due to biallelic variants in the recessive LHON-associated disease gene DNAJC30 in combination with heterozygous variants in CI subunits.

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