In nasopharyngeal carcinoma-bearing patients, tumors and lymphocytes are infected by different Epstein-Barr virus strains.
Despite the fact that most adult humans worldwide are latently infected by the Epstein-Barr virus (EBV), only a very small percentage of them will develop an EBV-associated malignancy. We do not know whether this situation reflects the existence of more sensitive individuals or of particularly tumorigenic EBV strains. We postulated that if highly tumorigenic EBV strains did exist, they would be preferentially found in consistently EBV-associated tumors, such as nasopharyngeal carcinoma (NPC), and differ significantly from the strains present in other, non-pathological sites of the same patients. To test this hypothesis, we compared the BNLF1 gene of the EBV strains present in tumors and in "reservoir lymphocytes" of 6 NPC-bearing patients from Tunisia. Our results show that all of these patients were infected by more than 1 (and up to 7) EBV strains. Moreover, lymphocytes and tumor cells from the same individual were systematically infected by different viral strains. The origin and biological significance of these multistrain infections are discussed.
Unité de Physiopathologie Cellulaire et Moléculaire, Unité propre 2163 du Centre National de la Recherche Scientifique, Centre Hospital.-Universitaire Purpan, Toulouse, France.
S
S
Henry
C
C
Sacaze
L
L
Berrajah
H
H
Karray
M
M
Drira
A
A
Hammami
J
J
Icart
B
B
Mariame
D000328:Adult; D000368:Aged; D001483:Base Sequence; D015139:Blotting, Southern; D002277:Carcinoma / Q000821:virology*; D005091:Exons; D005260:Female; D004854:Herpesvirus 4, Human / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008214:Lymphocytes / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009303:Nasopharyngeal Neoplasms / Q000821:virology*; D012150:Polymorphism, Restriction Fragment Length; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid; D014763:Viral Matrix Proteins / Q000235:genetics
C037662:EBV-associated membrane antigen, Epstein-Barr virus; D014763:Viral Matrix Proteins