Identification of novel mutations in the proton-coupled folate transporter (PCFT-SLC46A1) associated with hereditary folate malabsorption

Mol Genet Metab. 2011 May;103(1):33-7. doi: 10.1016/j.ymgme.2011.01.008. Epub 2011 Jan 25.


Hereditary folate malabsorption (HFM) is an autosomal recessive disorder, recently shown to be due to loss-of-function mutations of the proton-coupled folate transporter (PCFT-SLC46A1), resulting in systemic and central nervous system folate deficiency. Data is emerging on the spectrum of PCFT mutations associated with this disorder. In this report, novel mutations are described in three subjects with HFM: A335D/N68Kfs (c.1004C>A/c.204-205delCC), compound heterozygous mutations, and two homozygous PCFT mutations, G338R (c.1012G>C) and E9Gfs (c.17-18insC). Functional assessment of A335D and G338R PCFT mutants transfected into folate transporter-deficient HeLa R1-11 cells indicated a complete loss of transport activity. There were neurological deficiencies in two of the families reported; in particular, late-onset seizures. The importance of early diagnosis and treatment to achieve physiological cerebrospinal fluid folate levels is emphasized.

Publication types

  • Case Reports

MeSH terms

  • Amino Acid Substitution
  • Base Sequence
  • Child
  • Consanguinity
  • Genetic Association Studies
  • Genetic Diseases, Inborn / genetics
  • Genetic Diseases, Inborn / metabolism
  • Genotype
  • HeLa Cells
  • Humans
  • Malabsorption Syndromes / genetics*
  • Male
  • Mutation / genetics*
  • Pedigree
  • Proton-Coupled Folate Transporter / genetics*
  • Proton-Coupled Folate Transporter / metabolism
  • Young Adult


  • Proton-Coupled Folate Transporter