Abstract
697 children with concomitant strabism, all patients who were seen in the Ophthalmalogical university hospital and outpatient service of the Charité, Berlin, during a certain period, have been examined together with their parents and siblings. In a second series, 3398 12-years old school children (born 1953) from three urban districts of Berlin were examined at the occasion of a vaccination term, and 179 children with strabism were ascertained. Probands as well as their parents and siblings were examined thoroughly according to the criteria of strabism diagnostics. Incidence of squinting among siblings was increased markedly when compared with the population frequency, but did not reach the expectations under rthe assumption of a single, monomeric mode of inheritance. Admixture of phenocopies or new mutants could be excluded. Twin investigations (12 monocygotic and 27 dicygotic pairs) showed a manifestation rate of 94,1% in monocygotic pairs, corresponding to a 3 1/2 times higher concordance in monocygotic as compared with dicygotic twins. From the results discussed, a multifactorial genetic system in combination with a threshold effect seems to be the most likely genetic interpretation. An analysis of pedigrees shows that slight sensoric as well as motoric anomalies might combine in different and continuously varying quantities, contributing to the syndrom of concomitant strabism.
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Richter, S. Zur Heredität des Strabismus concomitans. Hum Genet 3, 235–243 (1967). https://doi.org/10.1007/BF00273125
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DOI: https://doi.org/10.1007/BF00273125