title: Geographically distinct HHV-8 DNA sequences in Saudi Arabian Iatrogenic Kaposi's sarcoma lesions.
abstract: A new member of the gamma-herpesvirus family, HHV-8 (also known as Kaposi's sarcoma (KS)-associated herpesvirus), has been linked to KS and body cavity-based lymphoma. Other members of this family, eg, Epstein-Barr virus, were originally thought to have only one strain, but subsequent analysis revealed different strains correlating to cellular patterns of infectivity and geographical location. To determine whether multiple strains of HHV-8 exist, we compared DNA sequences among KS and body cavity-based lymphoma-derived HHV-8 and examined differences in HHV-8 subgroups between American and Saudi Arabian iatrogenic KS patients. Samples were analyzed by polymerase chain reaction using multiple primer sets to five different open reading frames from HHV-8, and DNA sequencing was performed. HHV-8 DNA was present in all of our KS and body cavity-based lymphoma samples by polymerase chain reaction. HHV-8 DNA was detected in each body cavity-based lymphoma sample using a majority of the primers, whereas only two primer sets consistently amplified HHV-8 DNA derived from KS lesions. DNA sequencing within open reading frames 26 and 27 indicate the existence of at least three variants of HHV-8, with the majority of iatrogenic KS patients in Saudi Arabia containing unique nucleotide changes that may define a distinct, previously unidentified subgroup we term SA, whereas those from America were of Group A or B. Thus, although the sequencing data within open reading frames 26 and 27 did not permit discrimination between patients with lymphoma versus KS disease processes, HHV-8 derived from Saudi Arabian KS lesions were shown to have a distinct nucleotide sequence not seen in any of the other clinical samples examined.
authors.affiliation: Department of Pathology, Cardinal Bernardin Cancer Center, Loyola University Medical Center, Maywood, Illinois, USA.
authors.forename: K E
authors.initials: KE
authors.lastname: Foreman
authors.forename: S
authors.initials: S
authors.lastname: Alkan
authors.forename: A E
authors.initials: AE
authors.lastname: Krueger
authors.forename: J R
authors.initials: JR
authors.lastname: Panella
authors.forename: L J
authors.initials: LJ
authors.lastname: Swinnen
authors.forename: B J
authors.initials: BJ
authors.lastname: Nickoloff
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000150:complications / Q000821:virology; D001482:Base Composition; D001483:Base Sequence; D017931:DNA Primers / Q000737:chemistry; D004279:DNA, Viral / Q000032:analysis* / Q000235:genetics; D014644:Genetic Variation; D019288:Herpesvirus 8, Human / Q000235:genetics*; D006801:Humans; D007049:Iatrogenic Disease; D016393:Lymphoma, B-Cell / Q000821:virology; D008969:Molecular Sequence Data; D016366:Open Reading Frames / Q000235:genetics; D016133:Polymerase Chain Reaction; D012189:Retrospective Studies; D012514:Sarcoma, Kaposi / Q000821:virology*; D012529:Saudi Arabia; D017422:Sequence Analysis, DNA; D014407:Tumor Cells, Cultured
chemical_list: D017931:DNA Primers; D004279:DNA, Viral