title: GeneScan analysis to detect clonality of T-cell receptor γ gene rearrangement in feline lymphoid neoplasms.
abstract: Lymphoid neoplasms are usually diagnosed on the basis of cytological and histopathological findings. However, in some cases, discrimination of lymphoid neoplasms from reactive lymphoid proliferation is difficult. Polymerase chain reaction (PCR) amplification of the complementarity-determining region (CDR) 3 of the T-cell receptor (TCR) γ gene can be used to assess clonality of T-cell populations as a supportive diagnostic tool for T-cell neoplasms. Because the length variation in the TCRγ CDR3 is relatively small, false positive results may occur in non-neoplastic T-cell populations in the absence of high-resolution analytical methods for PCR products. In the present study, a PCR assay system was developed to detect clonal TCRγ gene rearrangement in feline lymphoid cells using GeneScan analysis. Thirty T-cell neoplasms, 27 B-cell neoplasms, and 34 non-neoplastic tissues were subjected to the newly developed TCRγ gene rearrangement analysis. Clonal TCRγ gene rearrangement was detected in 26 of 30 (87%) T-cell neoplasms, 2 of 27 (7%) B-cell neoplasms, and 1 of 34 (3%) non-neoplastic tissues. To compare GeneScan analysis with conventional PAGE and heteroduplex analysis, 20 clonal and 20 polyclonal samples were subjected to both analyses. Most of the results were concordant between the 2 analyses; however, several clonal peaks (bands) appeared as a single band when analyzed via conventional PAGE with heteroduplex analysis in 4 of the 20 (20%) clonal samples as a result of the difference in resolution. The PCR assay system to detect clonal TCRγ gene rearrangement in feline lymphoid cells, using GeneScan analysis, would be a useful molecular diagnostic tool for feline T-cell neoplasms, with high fidelity.
authors.affiliation: Department of Veterinary Internal Medicine, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Tokyo 113-8657, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Mochizuki
authors.forename: Kenji
authors.initials: K
authors.lastname: Nakamura
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Sato
authors.forename: Yuko
authors.initials: Y
authors.lastname: Goto-Koshino
authors.forename: Masahiko
authors.initials: M
authors.lastname: Sato
authors.forename: Masashi
authors.initials: M
authors.lastname: Takahashi
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Fukushima
authors.forename: Ko
authors.initials: K
authors.lastname: Nakashima
authors.forename: Yasuhito
authors.initials: Y
authors.lastname: Fujino
authors.forename: Koichi
authors.initials: K
authors.lastname: Ohno
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Uchida
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakayama
authors.forename: Hajime
authors.initials: H
authors.lastname: Tsujimoto
mesh_terms: D000818:Animals; D002371:Cat Diseases / Q000235:genetics* / Q000276:immunology; D002415:Cats; D003001:Cloning, Molecular; D004591:Electrophoresis, Polyacrylamide Gel / Q000662:veterinary; D005260:Female; D015334:Gene Rearrangement, gamma-Chain T-Cell Antigen Receptor / Q000235:genetics*; D020180:Heteroduplex Analysis / Q000662:veterinary; D008214:Lymphocytes / Q000276:immunology / Q000378:metabolism; D016393:Lymphoma, B-Cell / Q000235:genetics / Q000276:immunology / Q000662:veterinary*; D016399:Lymphoma, T-Cell / Q000235:genetics / Q000276:immunology / Q000662:veterinary*; D008297:Male; D016133:Polymerase Chain Reaction / Q000662:veterinary