X-linked mental retardation due to creatine transporter defect

S. W.K. De Kort, S. A. De Man, A. J.M. Hoogeboom, P. J.W. Pouwels, M. S. Van Der Knaap, G. M.S. Mancini, G. S. Salomons

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Two boys, aged 4 and 8 years, consulted a pediatrician for psychomotor and severe language/speech delay. Both patients showed growth deficiency and a gracile muscular system. Further investigation revealed an increased urinary creatine/creatinine ratio. DNA sequence analysis of SLC6A8 on the X-chromosome revealed two different mutations resulting in creatine transporter defect. Creatine transporter defect is a recently described cause of X-linked mental retardation that appears to be relatively frequent. The disease is characterized by the neuropsychological profile with mental retardation, ADHD, semantic-pragmatic language disorder and oral dyspraxia. The diagnosis is based on a combination of at least two tests: assessment of the urinary creatine/creatinine ratio, 1H-MRS of the brain, DNA sequence analysis of SLC6A8 or creatine uptake assay in cultured fibroblasts. Every male patient with mental retardation, speech/language disorder and/or growth deficiency should be screened for creatine transporter defect.

Translated title of the contributionX-linked mental retardation due to creatine transporter defect
Original languageDutch
Pages (from-to)173-178
Number of pages6
JournalTijdschrift voor Kindergeneeskunde
Volume74
Issue number5
Publication statusPublished - 1 Oct 2006

Cite this

De Kort, S. W.K. ; De Man, S. A. ; Hoogeboom, A. J.M. ; Pouwels, P. J.W. ; Van Der Knaap, M. S. ; Mancini, G. M.S. ; Salomons, G. S. / X-gebonden mentale retardatie door creatine transporter defect. In: Tijdschrift voor Kindergeneeskunde. 2006 ; Vol. 74, No. 5. pp. 173-178.
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X-gebonden mentale retardatie door creatine transporter defect. / De Kort, S. W.K.; De Man, S. A.; Hoogeboom, A. J.M.; Pouwels, P. J.W.; Van Der Knaap, M. S.; Mancini, G. M.S.; Salomons, G. S.

In: Tijdschrift voor Kindergeneeskunde, Vol. 74, No. 5, 01.10.2006, p. 173-178.

Research output: Contribution to journalArticleAcademicpeer-review

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De Kort SWK, De Man SA, Hoogeboom AJM, Pouwels PJW, Van Der Knaap MS, Mancini GMS et al. X-gebonden mentale retardatie door creatine transporter defect. Tijdschrift voor Kindergeneeskunde. 2006 Oct 1;74(5):173-178.