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Non-syndromic X-linked mental retardation (MRX) is a frequent cause of inherited mental retardation. It is a heterogeneous condition in which the first 12 genes discovered to date explain no more than 15% of the MRX situations ascertained by recurrence in multiplex families. In Rett syndrome (RTT), an X-linked dominant condition mostly sporadic and usually(More)
The TM4SF2 gene (localized at Xp11.4 between the loci DXS564 and DXS556) has been found to be mutated in one MRX family. In order to define the corresponding behavioral phenotype, global IQ and specific cognitive skills were assessed in seven males and three females of this family, independent of subject status. Mental retardation (MR) was mild in three(More)
Oligodendrocyte-myelin glycoprotein (OMgp) is expressed on the surface of oligodendrocytes and neurones and is thought to inhibit axonal regeneration after brain injury in adult, like Nogo and myelin-associated glycoprotein (MAG). We previously observed that the OMgp gene locus on chromosome 17 could be associated with autism, a developmental disorder. The(More)
Genetic heterogeneity has been demonstrated in FG syndrome. We report a systematic study of the X-inactivation profile of obligate carriers and other females in FG pedigrees. It was expected that the characterization of particular X-inactivation profiles in carriers in some families might be related to the same mutated gene. Analysis of the X-inactivation(More)
FG syndrome (OMIM 305450) is an X-linked condition comprising mental retardation, congenital hypotonia, constipation or anal malformations, and a distinctive appearance with disproportionately large head, tall and broad forehead, cowlicks and telecanthus. In a first linkage analysis carried out on 10 families, we demonstrated heterogeneity and assigned one(More)
FG syndrome is an X-linked condition comprising mental retardation, congenital hypotonia, macrocephaly, distinctive facial changes, and constipation or anal malformations. In a linkage analysis, we mapped a major FG syndrome locus [FGS1] to Xq13, between loci DXS135 and DXS1066. The same data, however, clearly demonstrated genetic heterogeneity. Recently,(More)
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