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An X-linked mental retardation (XLMR) syndrome belonging to the group of conditions characterised by the association of intellectual deficit with hypotonic facies (Mental retardation, X-linked-hypotonic facies).
ORPHA:93975Classification level: Disorder
Prevalence is unknown but the syndrome was first described in 1982 in five males from two generations of one family (three brothers and two of their maternal uncles).
The syndrome is characterised by the association of microcephaly, spasticity, epilepsy, deafness and severe intellectual deficit. Female carriers show microcephaly and subnormal intelligence.
Transmission is X-linked.