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Methionine synthase operates within the nucleus as well as the cytoplasm and interacts with proteins involved in DNA methylation. These findings suggest compartment-specific one-carbon metabolism, although direct substrate channelling and protection in cobalamin disorders remain unproven.
GLUT1 deficiency can cause epilepsy, movement disorders and language difficulties despite normal blood glucose. A Brazilian cohort highlights delayed diagnosis, variable expression within families, ketogenic diet benefits beyond seizure control and an exploratory severity score requiring further validation.
Pregnancy increases vulnerability to hypoglycaemia and lactic acidosis in fructose 1,6-bisphosphatase deficiency, particularly when oral intake falls. Gestational diabetes complicates glucose management, requiring coordinated nutritional planning and continued monitoring after delivery.
Citrin deficiency can present with neonatal cholestasis, childhood abdominal symptoms and growth difficulties, or later hyperammonaemia. Normal citrulline after infancy does not exclude the diagnosis, while carbohydrate intolerance and condition-specific emergency treatment require particular attention.
Hereditary fructose intolerance can remain undiagnosed into adulthood when patients instinctively avoid sweet foods. Fructose and sorbitol restriction remain central, while early ketohexokinase-inhibitor research offers preliminary insights into treatment and fatty liver mechanisms.
Adults with inherited neurometabolic disorders have diverse clinical and social needs. Childhood disease onset is not the same as childhood diagnosis, disease-specific treatments are common in this specialist cohort, and absence of formal support does not establish functional independence.
Citrin deficiency can produce neonatal acute liver failure without cholestasis and mimic citrullinaemia type 1 on newborn screening. Worsening synthetic function during high-carbohydrate treatment should prompt diagnostic review and rapid nutritional redirection.
Remethylation disorders can present with neurological, psychiatric, eye or renal disease across the age range; total homocysteine, methionine, methylmalonic acid, vitamin B12, holotranscobalamin and folate help distinguish vitamin deficiency from inherited metabolic disease.
Progressive ataxia, dysarthria and vertical supranuclear gaze palsy can remain diagnostically unresolved despite negative exome sequencing; evolving biomarkers and RNA sequencing from cultured fibroblasts may reveal deep intronic splicing abnormalities missed by conventional DNA testing.
Progressive ataxia, tremor, seizures and spinal MRI evidence of subacute combined degeneration can signal late-onset cobalamin C disease despite normal serum vitamin B12, prompting methylmalonic acid, homocysteine and targeted metabolic investigation.
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