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- W2023287794 endingPage "558" @default.
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- W2023287794 abstract "1.(1) The eye is very often malformed in cases of chromosome aberration. The following anomalies may be found: chorioretinal degeneration, high myopia, congenital cataract, anophthalmos, microphthalmia, coloboma of the uvea, persistence of the primary vitreous with Reese's retinal dysplasia, palpebral anomalies, etc. When one of these manifestations is present, a cytogenetic examination should therefore be considered, particularly if there are associated general malformations. 2.(2) When a chromosome aberration is found in a malformed subject, cytogenetic examination of the parents and siblings should be carried out. Balanced translocations will often be found. 3.(3) The different chromosome aberrations give rise to multiple anomalies and malformations, which may be found, isolated or associated, whatever chromosome group is involved, showing that they have no really specific action. 4.(4) When interpreting a karyotype, it should be remembered that the tissue culture in vitro can produce artificial mutations, which do not correspond to a mutation in vivo. An example has been given by Trujilloet al. (1961). Their patient presented with multiple bone fractures, blue sclera and other signs of Van der Hoeve's syndrome. An initial culture of blood showed a reciprocal translocation A ∼ C. In contrast, the cells obtained from a second blood culture showed normal karyotypes. Tissue cultures should therefore be repeated. 5.(5) The possibility of mosaicism should always be borne in mind, and several tissues should therefore be examined (blood, skin, muscle, fascia lata). 6.(6) It should not be immediately concluded that there is a cause-and-effect relation between a chromosome aberration and a phenotypic manifestation. The cytogenetic anomaly may, in fact, be the consequence of the disease, as in Waldenström's macroglobulinaemia or in disorders of thyroid metabolism. 7.(7) It is probable that still more chromosome aberrations will be found, particularly when we can make better studies of the intimate structure of chromosomes and the chemical composition of enzymes. It seems, however, that the number of ‘chromosome disorders’ will remain relatively limited for the simple reason that the majority of deletions and other chromosome aberrations are lethal. The list of disorders in which a karyotype anomaly has been sought in vain is already much longer than that in which a chromosome aberration has been demonstrated. Moreover, as long as it is not possible to recognize with certainty to which group a given chromosome belongs, to identify the chromosome itself or a fragment of chromosome, we must be cautious in the interpretation of a karyotype in a clinical case, and avoid creating new syndromes without sufficient proof." @default.
- W2023287794 created "2016-06-24" @default.
- W2023287794 creator A5015615787 @default.
- W2023287794 date "1967-05-01" @default.
- W2023287794 modified "2023-09-25" @default.
- W2023287794 title "Autosomal chromosome aberrations in ophthalmology" @default.
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