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Neuromuscul Disord. 2007 Jun;17(6):451-8. Epub 2007 Apr 12.

Cognitive profile in childhood myotonic dystrophy type 1: is there a global impairment?

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Institut de Myologie, Bâtiment Babinski, Groupe Hospitalier Pitié-Salpêtrière, AP-HP, Pitié-Salpêtriére, 47-83, Boulevard de l'Hôpital, 75651, Paris Cedex 13, France.


The objective of this study was to assess the cognitive profile in the childhood-onset form of myotonic dystrophy (DM1). We carried out a general cognitive abilities study on 36 patients (6-18 years). Results of Full Scale IQ , VIQ (Verbal IQ) and PIQ (Performance IQ) measures are discussed in terms of global cognitive impairment depending on the (CTG)n repeat size and the transmitting parent's sex. The results highlighted a negative correlation between the CTG repeat size and cognitive function: (1) 55% of the subjects (20/34) presented large CTG expansion (mean=761) correlated with significant extensive cognitive deficits (mean Full Scale IQ=56) in both intelligence scales (verbal and non-verbal); most of them exhibited DM1 maternal transmission. (2) In the case of smaller expansion (mean=527), 38% of the subjects exhibited a subnormal intelligence (mean Full Scale IQ=86) but performed poorly on subtests evaluating attention/memory function and presented a severe deficit in visuospatial and/or visuo-constructive skills. Most of these children had paternal transmission but a few had an affected mother.

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