Brain white matter 1 H MRS in Leber optic neuropathy mutation carriers

This study was conducted in order to test the hypothesis that proton MR spectroscopic (1H MRS) profile of Leber's hereditary optic neuropathy (LHON) mutation carriers group (including both symptomatic and asymptomatic) differs from group of healthy individuals and to determine metabolite or ratio that contributes most to differentiation.

We performed single voxel 1H MRS in normal appearing white matter of eighteen LHON mtDNA mutation carriers bearing one of three LHON mtDNA point mutations and in fifty control subjects.

ANOVA showed significant difference for absolute concentration of creatine (Cr) (p < 0.01) and N-acetylaspartate to creatine ratio (NAA/Cr) (p < 0.01). Discriminant analysis revealed that decreased absolute Cr followed by decreased absolute NAA concentration have the most significant contribution in discriminating LHON mutation carriers from healthy controls.

Abnormal metabolic profile in normal appearing white matter on MR imaging seems to be significantly present in LHON mutation carriers.