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Hereditary folate malabsorption : ウィキペディア英語版 | Hereditary folate malabsorption
Hereditary folate malabsorption (HFM - OMIM #229050) is a rare autosomal recessive disorder caused by caused by loss-of-function mutations in the proton-coupled folate transporter (PCFT) gene, resulting in systemic folate deficiency and impaired delivery of folate to the brain. ==Clinical presentation== Affected infants present within a few months after birth with failure to thrive and severe folate deficiency manifested as macrocytic anemia and developmental delays. There can be (i) pancytopenia, (ii) diarrhea and/or mucositis and/or (iii) immune deficiency due to T-cell dysfunction and hypoimmunoglobulinemia resulting in pneumonia usually due to Pneumocystis jirovecii. Recently, several infants with the immune deficiency syndrome were described. Untreated, or with inadequate treatment, there are progressive systemic and neurological signs with a spectrum of manifestations including seizures that are often intractable. Females with HFM are fertile and, if folate sufficient during pregnancy, have normal offspring. Subjects that carry one mutated PCFT allele are normal. The genomic and clinical features of HFM were recently reviewed.〔〔
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