Overview
Hereditary folate malabsorption is a genetic disorder characterized by impaired intestinal absorption and transport of folate, leading to severe folate deficiency, macrocytic anemia, and neurological impairments including developmental delay and seizures 12.Diagnosis
Clinical Features: Macrocytic anemia, failure to thrive, aphthous stomatitis, recurrent infections, neurological deficits (psychomotor retardation, behavioral disorders, early-onset seizures) 2.
Genetic Testing: Identification of biallelic variants in the SLC46A1 gene 2.
Laboratory Findings: Low folate levels in blood and cerebrospinal fluid 1.
Imaging: Characteristic brain imaging findings such as bilateral occipital cortical calcifications 1.Management
First-Line Treatment: Folinic acid supplementation 12.
- Route of Administration: Intramuscular administration may achieve higher folate levels in blood and cerebrospinal fluid compared to oral administration 1.
Monitoring: Regular assessment of plasma and cerebrospinal fluid folate levels to ensure normalization 1.Special Populations
Pediatrics: Early diagnosis and treatment with folinic acid are crucial for mitigating neurological and developmental impairments 12.Key Recommendations
Initiate folinic acid supplementation for confirmed hereditary folate malabsorption to restore folate levels and manage symptoms (Evidence: Strong 12).
Consider intramuscular administration of folinic acid to achieve optimal cerebrospinal fluid folate levels, particularly in severe cases (Evidence: Moderate 1).
Regular monitoring of folate levels in both blood and cerebrospinal fluid is essential to guide treatment efficacy (Evidence: Expert opinion 1).References
1 Lubout CMA, Goorden SMI, van den Hurk K, Jaeger B, Jager NGL, van Koningsbruggen S et al.. Successful Treatment of Hereditary Folate Malabsorption With Intramuscular Folinic Acid. Pediatric neurology 2020. link
2 Tan J, Li X, Guo Y, Xie L, Wang J, Ma J et al.. Hereditary folate malabsorption with a novel mutation on SLC46A1: A case report. Medicine 2017. link