title: Development of a new PCR protocol to detect and subtype Blastocystis spp. from humans and animals.
abstract: Blastocystis spp. is commonly found in the feces of humans worldwide. Infection has been reported as asymptomatic, acute symptomatic, and chronic symptomatic. This wide range of responses to infection could be related to the genetic diversity of morphologically indistinguishable specimens obtained from infected hosts. The former name Blastocystis hominis is now reported as Blastocystis spp. because of its genetic diversity. Blastocystis is recognized as a complex of subtypes that have not been fully characterized as independent species. The finding of Blastocystis spp. in feces from several animal species suggests a zoonotic potential. Based on conserved regions of published nucleotide SSU rDNA sequences from all Blastocystis subtypes found in GenBank, a PCR and sequencing protocol was developed. The ~500 bp SSU rDNA gene fragment amplified by this PCR is highly sensitive compared with published primers and contains highly variable regions that allow phylogenetic analysis of Blastocystis. These primers were used to detect and subtype Blastocystis spp. specimens from naturally infected humans, primates, cattle, pigs, and chickens. Based on these findings, application of this method can elucidate the complexity of this heterogeneous genus and its role in human and animal disease, as well as its zoonotic potential.
authors.affiliation: Environmental Microbial and Food Safety Laboratory, Animal and Natural Resources Institute, Agricultural Research Service, United States Department of Agriculture, Building 173, BARC-East, 10300 Baltimore Avenue, Beltsville, MD 20705, USA. monica.santin-duran@ars.usda.gov
authors.forename: Mónica
authors.initials: M
authors.lastname: Santín
authors.forename: María Teresa
authors.initials: MT
authors.lastname: Gómez-Muñoz
authors.forename: Gloria
authors.initials: G
authors.lastname: Solano-Aguilar
authors.forename: Ronald
authors.initials: R
authors.lastname: Fayer
mesh_terms: D000818:Animals; D016844:Blastocystis / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D016776:Blastocystis Infections / Q000175:diagnosis* / Q000662:veterinary*; D002417:Cattle; D002645:Chickens; D019411:Clinical Laboratory Techniques / Q000379:methods*; D017931:DNA Primers / Q000235:genetics; D016054:DNA, Protozoan / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D020459:Genes, rRNA; D006801:Humans; D008969:Molecular Sequence Data; D010274:Parasitology / Q000379:methods*; D016133:Polymerase Chain Reaction / Q000379:methods*; D011323:Primates; D016053:RNA, Protozoan / Q000235:genetics; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D012680:Sensitivity and Specificity; D017422:Sequence Analysis, DNA; D013552:Swine
chemical_list: D017931:DNA Primers; D016054:DNA, Protozoan; D004275:DNA, Ribosomal; D016053:RNA, Protozoan; D012337:RNA, Ribosomal, 18S