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Blood, 15 August 2007, Vol. 110, No. 4, pp. 1147-1152.
Prepublished online as a Blood First Edition Paper on April 19, 2007; DOI 10.1182/blood-2007-02-077099.
 Previous Article | Table of Contents | Next Article 
HEMATOPOIESIS
The spectrum of mutations in the PCFT gene, coding for an intestinal folate transporter, that are the basis for hereditary folate malabsorption
Rongbao Zhao1,
Sang Hee Min1,
Andong Qiu1,
Antoinette Sakaris2,
Gary L. Goldberg2,
Claudio Sandoval3,
J. Jeffrey Malatack4,
David S. Rosenblatt5, and
I. David Goldman1
1 Departments of Medicine, Molecular Pharmacology, and
2 Obstetrics and Gynecology, Albert Einstein College of Medicine, Bronx, NY;
3 Department of Pediatrics, New York Medical College, Valhalla, NY;
4 Department of Pediatrics, Alfred I. duPont Hospital for Children, Wilmington, DE;
5 Department of Human Genetics, McGill University, Montreal, QC, Canada
Hereditary folate malabsorption (HFM) is a rare autosomal recessive disorder caused by impaired intestinal folate absorption and impaired folate transport into the central nervous system. Recent studies in 1 family revealed that the molecular basis for this disorder is a loss-of-function mutation in the PCFT gene encoding a proton-coupled folate transporter. The current study broadens the understanding of the spectrum of alterations in the PCFT gene associated with HFM in 5 additional patients. There was no racial, ethnic, or sex pattern. A total of 4 different homozygous mutations were detected in 4 patients; 2 heterozygous mutations were identified in the fifth patient. Mutations involved 4 of the 5 exons, all at highly conserved amino acid residues. A total of 4 of the mutated transporters resulted in a complete loss of transport function, primarily due to decreased protein stability and/or defects in membrane trafficking, while 2 of the mutated carriers manifested residual function. Folate transport at low pH was markedly impaired in transformed lymphocytes from 2 patients. These findings further substantiate the role that mutations in PCFT play in the pathogenesis of HFM and will make possible rapid diagnosis and treatment of this disorder in infants, and prenatal diagnosis in families that carry a mutated gene.
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