{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T08:49:22Z","timestamp":1790153362579,"version":"4.0.1"},"reference-count":37,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2019,10,3]],"date-time":"2019-10-03T00:00:00Z","timestamp":1570060800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"German Research Council"},{"name":"Tistou and Charlotte Kerstan Foundation"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Acta Ophthalmologica"],"published-print":{"date-parts":[[2020,5]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>The aim of this study is to report on the phenotype and genotype of five patients diagnosed with Cohen syndrome, an extremely rare autosomal recessive disorder manifesting with mental and physiological defects.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Five patients from three German families and one Syrian family underwent a comprehensive ophthalmological examination. The scheduled visual acuity measurements, fundus ophthalmoscopy, spectral domain optical coherence tomography (OCT), full\u2010field electrophysiological recordings of scotopic and photopic electroretinograms (ERGs) and colour vision testing could not be carried out in all subjects, because of the mental and physical retardation. The genetic diagnosis was achieved by next\u2010generation sequencing.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      The ophthalmic and systemic phenotype of the patients is typical for Cohen syndrome including myopia, night blindness, photophobia, fundus pigmentary changes and bull's eye maculopathy. Electroretinograms (ERGs) were extinguished in the four patients, whose recording was possible. Genetic testing revealed homozygous or two heterozygous bi\u2010allelic mutations in the\n                      <jats:italic>\n                        <jats:styled-content style=\"fixed-case\">VPS<\/jats:styled-content>\n                        13B\n                      <\/jats:italic>\n                      (\n                      <jats:styled-content style=\"fixed-case\">COH<\/jats:styled-content>\n                      1) gene in all five patients, with five different allelic variants observed. The homozygous mutation c.6055_6056del\n                      <jats:styled-content style=\"fixed-case\">GA<\/jats:styled-content>\n                      ; p.Asp2019Glnfs*15 in two sibling patients as well as the homozygous nonsense mutation c.8112C&gt;G;p.Tyr2704* have not previously been reported.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The phenotype of the five patients reported here is typical for Cohen syndrome; however, their genotype is heterogeneous. Two new allelic variants were found to be the causative mutation.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/aos.14255","type":"journal-article","created":{"date-parts":[[2019,10,3]],"date-time":"2019-10-03T05:43:55Z","timestamp":1570081435000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Ophthalmic features of retinitis pigmentosa in Cohen syndrome caused by pathogenic variants in the\n                    <i>\n                      <scp>VPS<\/scp>\n                      13B\n                    <\/i>\n                    gene"],"prefix":"10.1111","volume":"98","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5309-7155","authenticated-orcid":false,"given":"Fadi","family":"Nasser","sequence":"first","affiliation":[{"name":"Centre for Ophthalmology University of Tuebingen Tuebingen 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