Rocío Arce-González1, Oscar Francisco Chacon-Camacho1,2, Vianey Ordoñez-Labastida1,3, Enrique O Graue-Hernandez4, Alejandro Navas-Pérez4, Juan Carlos Zenteno5,6. 1. Department of Genetics, Institute of Ophthalmology "Conde de Valenciana", 14, Col. Obrera, Cuauhtemoc, 06800, Mexico City, CP, Mexico. 2. Carrera de Médico Cirujano, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Tlalnepantla, Estado de México, Mexico. 3. Faculty of Medicine, Autonomous University of the State of Morelos, UAEM, Leñeros S/N, Los Volcanes, 62350, Cuernavaca, Morelos, Mexico. 4. Cornea Department, Institute of Ophthalmology "Conde de Valenciana", Mexico City, Mexico. 5. Department of Genetics, Institute of Ophthalmology "Conde de Valenciana", 14, Col. Obrera, Cuauhtemoc, 06800, Mexico City, CP, Mexico. jczenteno@institutodeoftalmologia.org. 6. Biochemistry Department, Faculty of Medicine, National Autonomous University of Mexico (UNAM), Mexico City, Mexico. jczenteno@institutodeoftalmologia.org.
Abstract
AIM: To describe a family segregating a novel truncating ZNF469 homozygous mutation causing brittle cornea syndrome type 1 in a male patient and associated with corneal ectasia in his two heterozygous young children. METHODS: A 49-year-old affected male and his 12- and 8-year-old, apparently healthy, siblings underwent phenotypic and genetic assessment. An Oculus Pentacam Scheimpflug topographer system was employed for keratometries and central corneal thickness measurements. Exome sequencing was performed in DNA from the index case with subsequent Sanger sequencing confirmation of the ZNF469 gene causal variant in his relatives. RESULTS: The index case had a history of bilateral keratoglobus, corneal perforations, bilateral hypoacusia, and skeletal anomalies. His two children exhibited topographic anomalies compatible with keratoconus suspects as well as mild skeletal anomalies. Genetic analysis identified a novel homozygous c.2340delC variant in the ZNF469 gene, which predicts a p.(Arg781Glufs*19) truncated protein. Sanger sequencing identified heterozygosity for the c.2340delC variant in DNA from both siblings. CONCLUSION: Our results expand the mutational spectrum associated with brittle cornea syndrome and provide the first demonstration of early corneal anomalies in subjects carrying monoallelic ZNF469 variants.
AIM: To describe a family segregating a novel truncating ZNF469 homozygous mutation causing brittle cornea syndrome type 1 in a male patient and associated with corneal ectasia in his two heterozygous young children. METHODS: A 49-year-old affected male and his 12- and 8-year-old, apparently healthy, siblings underwent phenotypic and genetic assessment. An Oculus Pentacam Scheimpflug topographer system was employed for keratometries and central corneal thickness measurements. Exome sequencing was performed in DNA from the index case with subsequent Sanger sequencing confirmation of the ZNF469 gene causal variant in his relatives. RESULTS: The index case had a history of bilateral keratoglobus, corneal perforations, bilateral hypoacusia, and skeletal anomalies. His two children exhibited topographic anomalies compatible with keratoconus suspects as well as mild skeletal anomalies. Genetic analysis identified a novel homozygous c.2340delC variant in the ZNF469 gene, which predicts a p.(Arg781Glufs*19) truncated protein. Sanger sequencing identified heterozygosity for the c.2340delC variant in DNA from both siblings. CONCLUSION: Our results expand the mutational spectrum associated with brittle cornea syndrome and provide the first demonstration of early corneal anomalies in subjects carrying monoallelic ZNF469 variants.
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