To the Editor: Ramaekers et al. (May 12 issue)1 report 28 patientswith the cerebral folate deficiency syndrome characterized bydecreased levels of 5-methyltetrahydrofolate (5MTHF) in thecerebrospinal fluid caused by autoantibodies' blocking of folatetransport into the brain. The patients benefited from folinicacid supplementation.
The clinical features of this syndrome fit with other neurodegenerativedisorders. According to previous papers by the authors, thelatter disorders can be associated with cerebral folate deficiencyas a secondary phenomenon.2,3,4 Patients with secondary cerebralfolate deficiency (e.g., the Rett syndrome) potentially benefitfrom folinic acid supplementation.2,3,4 The authors do not reportthe . . . [Full Text of this Article]
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