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Mutation Screening and Association Study of the Folylpolyglutamate Synthetase (FPGS) Gene with Susceptibility to Childhood Acute Lymphoblastic Leukemia

  • Piwkham, Duangjai (Department of Pathology, Faculty of Medicine Ramathibodi Hospital, Mahidol University) ;
  • Siriboonpiputtana, Teerapong (Department of Pathology, Faculty of Medicine Ramathibodi Hospital, Mahidol University) ;
  • Beuten, Joke (Department of Pediatrics, University of Texas Health Science Center at San Antonio) ;
  • Pakakasama, Samart (Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital, Mahidol University) ;
  • Gelfond, Jonathan AL (Epidemiology and Biostatistics, University of Texas Health Science Center at San Antonio) ;
  • Paisooksantivatana, Karan (Department of Pathology, Faculty of Medicine Ramathibodi Hospital, Mahidol University) ;
  • Tomlinson, Gail E (Department of Pediatrics, University of Texas Health Science Center at San Antonio) ;
  • Rerkamnuaychoke, Budsaba (Department of Pathology, Faculty of Medicine Ramathibodi Hospital, Mahidol University)
  • Published : 2015.06.26

Abstract

Background: Folylpolyglutamate synthetase (FPGS), an important enzyme in the folate metabolic pathway, plays a central role in intracellular accumulation of folate and antifolate in several mammalian cell types. Loss of FPGS activity results in decreased cellular levels of antifolates and consequently to polyglutamatable antifolates in acute lymphoblastic leukemia (ALL). Materials and Methods: During May 1997 and December 2003, 134 children diagnosed with ALL were recruited from one hospital in Thailand. We performed a mutation analysis in the coding regions of the FPGS gene and the association between single nucleotide polymorphisms (SNPs) within FPGS in a case-control sample of childhood ALL patients. Mutation screening was conducted by polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) and subsequently with direct sequencing (n=72). Association analysis between common FPGS variants and ALL risk was done in 98 childhood ALL cases and 95 healthy volunteers recruited as controls. Results: Seven SNPs in the FPGS coding region were identified by mutation analysis, 3 of which (IVS13+55C>T, g.1297T>G, and g.1508C>T) were recognized as novel SNPs. Association analysis revealed 3 of 6 SNPs to confer significant increase in ALL risk these being rs7039798 (p=0.014, OR=2.14), rs1544105 (p=0.010, OR= 2.24), and rs10106 (p=0.026, OR=1.99). Conclusions: These findings suggested that common genetic polymorphisms in the FPGS coding region including rs7039789, rs1544105, and rs10106 are significantly associated with increased ALL risk in Thai children.

Keywords

Folylpolyglutamate synthetase;acute lymphoblastic leukemia;single nucleotide polymorphism

Acknowledgement

Supported by : Thailand Research Fund (TRF), Texas Higher Education Coordinating Board

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