• Nancy Monroy-Jaramillo, Aurelio Cerón, Elizabeth León, Verónica Rivas, Adriana Ochoa-Morales, María Georgina Arteaga-Alcaraz, Fausto Carlos Nocedal-Rustrian, Cecilia Gallegos, María Elisa Alonso-Vilatela, Teresa Corona, and José Flores.
• Department of Neurogenetics, Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez, Mexico City, Mexico.
• Rev Invest Clin. 2018 Jan 1; 70 (2): 68-75.

BackgroundRetinal vasculopathy with cerebral leukodystrophy (RVCL) is an adult-onset, autosomal dominant disease involving microvessels of the brain and eye resulting in central nervous system degeneration with visual disturbances, stroke, motor impairment, and cognitive decline. Frameshift mutations at the C-terminus of TREX1 gene are the molecular cause of this disorder.ObjectivesThe objective of this study is to present the different clinical manifestations of RVCL in three-related patients and to investigate the presence of TREX1 mutation in the extended genealogy.MethodsMultidisciplinary testing was performed in three related patients. Based on their family history, the study was extended to 34 relatives from the same small community. Neurological evaluation, sequencing of TREX1, and presymptomatic diagnosis were offered to all participants.ResultsThe patients exhibited the heterozygous TREX1 mutation p.V235Gfs*6, but with phenotypic variability. In addition, 15 relatives were identified as pre-manifest mutation carriers. The remaining participants did not carry the mutation.ConclusionsThis is the figrst report of a large Mexican genealogy with RVCL, where the same TREX1 mutation causes a variation in organ involvement and clinical progression. The early identification and follow-up of individuals at risk may help provide insights into the basis for this variability in presentation.Copyright: © 2017 SecretarÍa de Salud.

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