Cataract and myotonic dystrophy: the role of molecular diagnosis.
نویسندگان
چکیده
Myotonic dystrophy (dystrophia myotonica), the commonest and most variable of the muscular dystrophies of adult life, has long been known to be associated with cataract, while slit-lamp examination for specific lens opacities has been one of the principal methods of presymptomatic detection of gene carriers. The recent discovery that the myotonic dystrophy mutation is an unstable DNA sequence, composed of varying numbers of CTG triplet repeats, now allows a specific molecular test for this disorder, as well as explaining the phenomenon of anticipation. A series of case reports is presented to illustrate the important practical applications of this development in relation to ophthalmic aspects of the disorder. Reassessment of the specificity of the ophthalmic changes may be required and it will be important for molecular analysis to be used alongside ophthalmic studies, when determining whether family members carry the mutation for myotonic dystrophy.
منابع مشابه
Genotype–Phenotype Correlations in Iranian Myotonic Dystrophy Type I Patients
Objectives: Myotonic Dystrophy type I (DM1) is a dominantly inherited disorder with a multisystemic pattern affecting skeletal muscle, heart, eye, endocrine and central nervous system. DM1 is associated with the expansion and instability of CTG repeat in the 3chr('39') untranslated region of the myotonic dystrophy protein kinase (DMPK) gene located on chromosome 19q13.3. The aim of this study w...
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PURPOSE To detect MD1 premutation and full mutation carriers among cataract patients and offer familial genetic counseling. METHODS We studied the DNA of 60 selected cataract patients through polymerase chain reaction analysis. This study was performed at the "Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto" where selected patients had been examined at the Cataract Outpatient...
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EDITOR—Myotonic dystrophy is the most common muscular dystrophy of adult life, with a frequency of around 3-15 per 100 000 in most European populations. It is characterised by multisystemic involvement and extreme intraand interfamilial variability in age at onset and degree of severity, which may range from subjects with cataract alone to severely aVected infants with neonatal hypotonia, respi...
متن کاملMyotonic dystrophy type 1: frequency of ophthalmologic findings.
The purpose of the study was to evaluate the frequency of ophthalmologic abnormalities in a cohort of myotonic dystrophy type 1 (DM1) patients and to correlate them with motor function. We reviewed the pathophysiology of cataract and low intraocular pressure (IOP). Method Patients were included after clinical and laboratory diagnosis and after signed informed consent. They were evaluated by Mot...
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Background & Aims: Nearly 30 hereditary disorders in humans result from an increase in the number of copies of simple repeats in genomic DNA, including fragile X syndrome, myotonic dystrophy, Huntington’s disease, and Friedreich’s ataxia. One the most frequently occurring types of mutation is trinucleotide repeat expansion. The present study was conducted with the aim of investigating the cause...
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ورودعنوان ژورنال:
- The British journal of ophthalmology
دوره 77 9 شماره
صفحات -
تاریخ انتشار 1993