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While it has long been thought that most of cerebral creatine is of peripheral origin, the last 20 years has provided evidence that the creatine synthetic pathway (AGAT and GAMT enzymes) is expressed in the brain together with the creatine transporter (SLC6A8). It has also been shown that SLC6A8 is expressed by microcapillary endothelial cells at the blood–brain barrier, but is absent from surrounding...
Creatine deficiency syndromes, due to deficiencies in AGAT, GAMT (creatine synthesis pathway) or SLC6A8 (creatine transporter), lead to complete absence or very strong decrease of creatine in CNS as measured by magnetic resonance spectroscopy. Brain is the main organ affected in creatine-deficient patients, who show severe neurodevelopmental delay and present neurological symptoms in early infancy...
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