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(CANCER RESEARCH 50. 6171-6175. October I. I990| Rearrangements in the Human T-Cell-Receptor «-ChainLocus in Patients with Adult T-Cell Leukemia Carrying Translocations Involving Chromosome 14qll' Masaharu Isobe, Naoki Sadamori, Giadomenico Russo, Shoichi Shimizu, Shunji Yamamori, Takahiro Itoyama, Yasuaki Yamada, Shuichi Ikeda, Michito Ichimaru, Jacob Kagan, and Carlo M. Croce2 Department of Patho-biochemistry. Research Institute for Oriental Medicines, Toyama Medical and Pharmaceutical L'nirersily, Toyama 930-01, Japan /M. I.]; Department of Hematology, Atomic Disease Institute, Nagasaki L'nÃ-versÃ-ly, School of Medicine, Nagasaki 852, Japan ¡N.S.. T. I., Y. Y., S. /., M. /./,- Raggio-ltalgene, Pomezia, Roma, Italy [G. R.¡;Mitsubishi Yuka Bio-Clinical Laboratories, Inc., Tokyo 174, Japan ¡S.S., S. Y.J; and Fels Institute for Cancer Research and Molecular Biology, Temple University, Philadelphia, Pennsylvania 19140 ¡J.A'., C. M. C.J a very extensive panel of probes to look for the rearrangements in the TCR a/5 locus. This locus contains an extra large J« We describe 5 cases of adult T-cell leukemia (ATL) carrying translo region (21) and a complex TCR «locus. Using these probes we cations at chromosome 14ql 1, where the genes for a- and ¿-chainsof the T-cell receptor (TCR a/6) reside (Croce et al., 1985; Isobe et al., 1988). found deletions of the TCR ôlocus in all cases of ATL. And we were also able to demonstrate rearrangements in the J« Since the TCR aßlocus is the region where several types of chromosome translocations occur in T-cell tumors, rearrangements of the TCR aß locus in DNA from 5 ATL patients. ABSTRACT locus in those ATL cases were studied as a first step to characterize these translocations at the molecular level. For this purpose we have generated an extensive series of probes to define the specificity and the diversity of rearrangement occurring at the widely spanned Jor-Ca locus and the complex D6-JÕ-C6-VÕ2 locus. Using a set of probes, we have found the deletion of the TCR 6 locus in all ATL cases, and at least 2 rearrangements in the J6 locus in each case of ATL. It is possible that translocations in the TCR a locus may be involved in ATL. INTRODUCTION ATL3 is defined on the basis of the clinical picture, distinct morphology of the abnormal lymphocytes, and T-cell markers. Particularly close association of HTLV-I infection with leukemogenesis of ATL has often been reported by a number of serological and epidemiológica! studies (1,2). However, lack of oncogenes in the HTLV-I genome (3) and the occurrence of disease in a very small proportion (0.01-0.02%) of HTLV-Iinfected individuals (1) imply that additional genetic changes may be required for the onset of the disease. Nonrandom chromosome translocations are a nearly constant feature of human leukemias and lymphomas. In 1985, we reported re arrangements of 14ql 1 to be specific for the acute type of ATL (4), which was confirmed by others (5). To this region, we have mapped the loci for the TCR a/o gene (6, 7). The chromosomal region at band 14ql 1 was also found to be rearranged in other types of T-cell malignancies (8). The molecular involvement of the TCR a/o gene in a number of translocations such as t(8;14) (q24;q 11) (7, 9), t( 14; 14) (q 11;q32) ( 10, 11), inv( 14) (q 11q32) (11-14), t(ll;14) (pl3;qll) (15, 16), t(ll;14) (pl5;qll) (17), t( 10; 14) (q23;q 11) ( 18), and t( 1; 14) (p32;q 11) ( 19, 20) has been described in the HTLV-I-negative T-cell malignancies. Those breakpoints specifically occur within the J or the D region of the TCR a/ó locus. However, there is no report of the direct involvement of the TCR «/ólocus in the patient with ATL which is positive for the HTLV-I.As a first step to determine the location of translocation breakpoints in ATL, we prepared Received 1/26/90; accepted 7/2/90. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact. ' This work was supported in part by a Grant-in-Aid for Cancer Research from the Ministry of Education, Science, and Culture, Japan. 2 To whom requests for reprints should be addressed, at Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine. 3420 North Broad Street. Philadelphia. PA 19140. 3The abbreviations used are: ATL, adult T-cell leukemia/lymphoma; HTLVI, human T-cell leukemia virus I; TCR, T-cell receptor; TEA, T-cell early «;J (D), joining (diversity) region of the TCR H/ÕI locus. MATERIALS AND METHODS Cytogenetic Analysis. Samples for the cytogenetic studies were ob tained from the peripheral blood of ATL patients at the time of diagnosis. Mononuclear cells separated by centrifugation over FicollHypaque gradients were cultured in RPMI 1640 medium supplemented with 10% fetal calf serum without any mitogens. The cells were har vested after 1 or 20 h. Colcemid was added 1 or 2 h before harvesting. In each specimen, at least 15 metaphases were analyzed using G- and Q-banding techniques. Probes. Probes for the TCR a/o locus were generated from genomic clones (7, 10) and subcloned into pBluescript SK(-) for the probes pMll, pMI2, pMI4-6, pMI8-13, ppMIlS, and pMI19, pucl9 for those of pMI3 and pMM6, plBI25 for that of pMI14, and M13mpl8 for those of pMI17 and plVIIlS. The location of probes and the cloning sites of each fragment are indicated in Fig. 2. Analysis of DNA. DNA was extracted from peripheral lymphocytes and digested with one of the restriction enzymes, BamHl, Sstl. or EcoR\, according to the suppliers' recommendations. The cut DNA was separated by electrophoresis on 0.6% agarose gel. transferred to nitrocellulose filter according to the methods described by Southern (22), and hybridized to 32P-labeled genomic J«/5 probes. Re arrangement was scored by loss of germ line band or by the appearance of prominent new bands. RESULTS Cytogenetical Analysis of ATL Cases. Abnormal clones found in 5 patients with ATL are shown in Table 1. The modal chromosome numbers ranged from 46-48. All 5 patients had either an inversion or a reciprocal translocation involving chro mosome 14, band qll, such as inv(14) (qll;q32) in case 1, t(12;14)(q24;qll) incase 2, t(14;14) (ql I;q32) in cases 3 and 4, and der(14) t(14;3) (qll;ql2) in case 5. Those chromosome abnormalities involving 14ql 1 are shown in Fig. 1. It has been shown that the loci for TCR a/o reside in chromosomal region 14ql 1 where several chromosomal translocations are found to occur in T-cell malignancies (7, 9-20). On the other hand, in our cases there was no evidence of abnormalities of chromo some 7 where the loci for the /3- and ^-chains of TCR are located, at bands 7q35 and 7pl4, respectively (23, 24). Probes for TCR a/6 Locus. As shown in Fig. 2, we have developed 20 DNA probes to look for the rearrangement of the D5-Ja-C(5/Jtt-Ctt locus including 3 probes (pMll 1, pMI12, and pMI19) which have been reported previously (7, 10). Since the deletions or rearrangements in the TCR locus usually occur 5' to either the D or the J segments, we prepared probes that 6171 Downloaded from cancerres.aacrjournals.org on June 18, 2017. © 1990 American Association for Cancer Research. TCR-c. REARRANGEMENTS IN ADULT T-CELL LEUKEMIA arrangement in the TCR a locus is shown in Table 3. Both alÃ-elesof the TCR ¿locus were deleted in all cases of ATLs (Table 3, Fig. 3). Although there is a faint band of the germ line Ja band detected with pMI19 in cases I, 2, and 3, these bands were probably due to contamination of normal cells, since cytogenetic analysis showed that only 81, 56, and 35% of cells were found to be leukemic cells in patient's 1, 2, and 3, •là Case 1 14 respectively (Table 1). Moreover, the intensity of those bands compared with the human placental DNA as a germ line control were about 10, 30, and 50% in cases 1, 2, and 3, respectively (Fig. 3). As shown in Table 3, we found at least two re arrangements of the a locus in each cases of ATL. Fig. 4 depicts an example of rearrangement detected in cases 3, 4, and 5 using a pMI3 probe. ÄamHI-digested DNA from cases 3 and 4 showed a rearranged band of 6.3 and 13 kilobases, respectively, as well as a 5.4-kilobase germ line band. Ssfl-digested DNA from case 5 shows 2 rearranged bands (one 7.5-kilobase band and another 13-kilobase faint band) as well as a faint 8.4kilobase germ line band which probably derived from the con tamination with normal cells. We found the same re arrangements in case 5 using the pMI2 probe, but the intensity of two bands was almost identical. However, no rearrangement was detected by using the pMI2 probe when the DNA from case 5 was digested by BamHl (Fig. 2). Thus, one of the rearrangements, corresponding to the 13-kilobase band, took place within, but near the 3' end of, the pMI3 probe. Another rearrangement, corresponding to the 7.5-kilobase band, took place between the pMI4 and pMI3 probes, since we did not detect any rearrangement band using a pMI4 probe. The other rearrangements in cases 3 and 4 were found by using a pHO.6 probe. The size of the rearranged EcoRl fragments was 5.5 and 1.8 kilobases, respectively. Two rearranged BamHl fragments of 4.7 and 4.5 kilobases were found in case 1 using pMIlO and pMI13 probes, respectively. In case 2 there are two rearranged EcoRl fragments detected by pMI8 and pMIlO. The sizes of the fragments were 13 and 13.5 kilobases, respectively. Case 2 14 Case 4 14 Case 5 Fig. 1. Four types of 14qll anomaly. inv(14) (qllq32), ill 2:141 (q24;qll). Ml4:l4i (qll:q32). and der(14)t(14;3) (ql I:ql2) in cases 1, 2, 4. and 5. respec tively. Arrows, positions of chromosomal breakpoint. DISCUSSION contained the most 3' region of the genomic fragments digested with either BamHl or EcoRl in the TCR a/6 locus in order not to miss the rearrangement (Fig. 2). The germ line restriction fragments obtained with those probes are shown in Table 2. A panel of those probes made it possible to look for most of the rearrangements occurring 5' to each D or J segment as well as in the Vi52 region, which is located between O or Ja in the TCR a/o locus (26), using a combination of BamHl, EcoRl, and Sstl digests of the DN A samples. TCR a/6 Rearrangements in ATLs. A summary of the re The TCR a/a locus has two prominent features compared to other TCR loci. The first is the presence of an extra large Ja region which spans about 73 kilobases from the 5' end of Ca region (Fig. 1). The second is the presence of the TCR o locus inside the TCR a locus. This large Ja region has been making it difficult to find rearrangements in the TCR a/a locus. Our panel of probes described in this paper proved to be very useful in localizing the rearrangements in the D6-C6/J«-Co locus in DNA from patients' peripheral blood. This approach, therefore, will provide a powerful method to diagnose the clonality of the Table 1 Hematological cytogenic data forßrepatients with adult T-cell leukemia Patient Case 1 Age (yr) 65 Sex M 2 61 F Leukocyte count( el ! 50.600 8,500 Leukemic cells (%) 81 56 Clonal karyotype 47. X, -Y, +3, +mar. del (6) (p23). inv (14) (ql Iq32) 48, XX. +4, +18, -19, -21, -22, +3mar. t (3;10) (ql I;ql2). t (I2;14) (q24;qll) 3 65 F 51.600 35 48. X, -X. +2. -4, -(-der (4) t (4;?) (p16:?), del (5) (ql3), t (l4;14) (ql I;q32), del (14) (ql Iql3), +2mar 4 57 F 183,500 91 46. X. -X, -10, -12, +14. -17, +3mar, t (14;14) (ql I;q32) 5 40 M 84,850 86 46. XY.-14, dup (I) (q2lq32). del (3) (ql2). del (5) (pl3),-(-der (14) t 6172 Downloaded from cancerres.aacrjournals.org on June 18, 2017. © 1990 American Association for Cancer Research. TCR-,, REARRANGEMENTS IN ADULT T-CELL LEUKEMIA «J3 «• CM—HtObO—H— — o1o O—H 1—1 BS¿|! ss!" IHH M"*»B SII SI/1 S i SS i i SU il! il1 X [X» E* l * •!!•IlM HH||< 1o1—*ëD Ȕ,s „ HHHHH,. Si1 E E E !Ls)li'sîl,s *W !HHH. EE*E * , X E PMII7i 1100 i , H XX (1 Kg EEEE :¡iMill B E E B• UH 1a HB"BKV( B B _BpMI15 SpMI9H l70 HS B li i,H EpMI7 B E , H, H sÃ-fs?!l'f Ã-£l!'i?-u?isss i l¡I' ' pMIIP B i50KilobasesS 1 !40B pHOEl l30 60E BPMI2 B H HPMI4B E pMIB1 i UT— 1 23 m —i—a— 1—Co t-l t\ HHB pMIEHHI EpMIIOi pMIt31 i80B 1 0-4- E E EpMIllE B 90E o 1—1— M-O Y/Sil ;IH.I:B pMMB pMI16E 1110B 1 ,H o— a 1—a— i—o— 1—a1 —a— 1a— 11li11Kf II11B 8• E BpMI19i 1 BpMI31 pMI5e i 1IO 20B ! 1 1 0 -IO Fig. 2. Genomie map of the human Cô-J5-O-VU2/J«-C«locus showing position of probes used in this study. The restriction map was deduced from analysis of overlapping recombinant cosmid and \ clones obtained from various genomic libraries (7, 10). Restriction sites are given for /¡«ml II (fi), EcoRl (E), ///m/lll (//), Sstl (S), and Xba\ (A"). Top line, black boxes, structural genes. Location of Do, J5, Co, V<52,TEA, pseudo-J« (<t>Ja),}n, and C«are Refs. 9-15, 21 and 25-30. *, polymorphic restriction sites. Solid bars, 20 probes generated from genomic DNA clones. The cloning sites of each fragment are indicated on each of the probes. +, the cloning site which was generated during cloning steps. Table 2 DNA probes and restriction enzymes used Probea, makes a noncoding RNA (27). The expression of TEA and of pseudo-J« (0Jtt), which is located just 3' to the TEA, is pos line frag enzymeSstllt,l ments (kilobases)5.2 tulated to be important for the deletion of the TCR a locus together with the <5Recregion, which is located between V51 USstlBamHlSst\BamHlSstlBamHlEcoRlBamHlSstlEcoRlBamHlSstlEcoRlBamHlEcoRlEcoRlBamHlEcoRlBamHlEcoRlBamHlBamHlBamHlBamHlBamHlBamHlBamHlBamHlBam in] and Do, before the TCR «rearrangement begins (28). 5.25.08.45.48.45.42.4+ + 2.3 + Use of immunoglobulin and T-cell receptor genes for study of clonality and lineage in lymphoproliferative disorders is well established. Although these molecular probes are valuable in the establishment of clonality, their usefulness in defining lin 1.43.35.1 eage requires careful consideration. For example, it has recently been shown that the TCR 5 locus is often rearranged in B+8.44.84.0 lineage acute lymphocytic leukemia as well as in "prethymic" 3.68.2 + T-cell acute lymphocytic leukemia (31). Nevertheless, there is 5.14.53.83.08.23.6 + a hierarchy of frequency of rearrangements, TCR 5 > TCR 7 > TCR 0+0, which reflects the presumed ontogenetic timing of such rearrangements in normal T-cell development (TCR ô 3.88.26.0 + before y before o and /i). From this point of view, it is reasonable to have a biallelic deletion of the TCR ¿locus and re 3.64.811.6 + arrangements of the J«locus in ATL since the HTLV-I virus 6.011.64.4 + 3.2 + can only infect CD4-positive T-cells. In fact, all of the ATL cases we have reported in this paper had CD4-positive and 11.64.41.69.414.014.014.015.3Ref.10107 + CDS-negative phenotypes (data not shown). The direct involvement of the TCR a/6 locus in the (8; 14) JaVi2J63, <t> Ja, translocations involving c-myc oncogenes has been demon CiD63, strated (7, 20, 32). As a result of the translocation, the Ja-Ca or J<5-O-J«-Ca region is moved to a region 3' to the involved JJl, Ji2ClonepMIlpMI2pMI3pMI4pMI5pM16pH0.6pM17pMI8pMI9pMIIOpMIllpMll2pMII3pMH4pMH5pMIlópM117pMIISI.Mll'iRestriction c-myc oncogene on the 8q+ chromosome causing a transcriptional deregulation of the involved c-myc gene (32). These T-cell malignancies and to determine the sites of chromosomal findings suggest that the locus for the <• or ¿-chainmay be involved in deregulation of putative oncogenes in T-cell malig translocations in T cell neoplasm. It is worthwhile to mention that probe pMIIS includes a nancies, similar to the role of the human immunoglobulin loci in c-myc and bcl-2 deregulation in Burkitt lymphoma and in region named TEA which is transcribed in fetal thymocytes JaTEA, 2.24.08.4 + Table 3 Patterns of T-cell receptor a-gene rearrangements Patient1 R/D G/R D/D D/D D/D D/D D/D G/D G/G G/G G/G D/D D/D D/D D/D D/D D/D R/D G/D G/R D/D D/D G/G D/D D/D D/D D/D D/D D/D R/D D/D D/D G/D G/R G/G D/DpMI13Rl/D D/DpMI12Rl/D D/DpMIllG/D D/DpMIIOG/R D/DpHO.6G/G 5pMI19D/D" D/DpMIISD/D D/DpMI9G/G D/DPMI8G/G D/DpMISG/G D/DpMI3G/G R/RpMIlG/GG/G G/G 'G, germ line; D. deletion; R. rearrangement: Rl. the same rearrangement detected by two consecutive probes, pMH3 and pMll2. 2 34 6173 Downloaded from cancerres.aacrjournals.org on June 18, 2017. © 1990 American Association for Cancer Research. TCR-Ã-vREARRANGEMENTS (Kb) 15.3- IN ADULT T-CELL LEUKEMIA G 1 2 345 TCR loci, like the Jß-Cß and the Ja-C«loci, have moved to the so-called tcl-1 region at chromosome 14q32.1, centromeric to the IgH locus (36). From this point of view it is very important to clarify whether the J«rearrangements found in ATL cases are actually involved in translocations. For this purpose we are presently cloning the rearranged «loci to establish whether they are involved in the translocations observed by cytogenetic analysis. This seems to be likely since in all of the previously described translocations in B- and T-cell malignancies the translocation involves the unproductively rearranged immunoglobulin or TCR gene (9, 35). Furthermore, it will be important to establish whether there is a relationship between breakpoints at chromosome 14q32 found in HTLV-I-positive and HTLVnegative T-cell malignancies. ACKNOWLEDGMENTS We thank Nobuyuki Kurosawa, Hideki Nagumo, and Donna Papsun for their excellent technical assistance and Dr. Zen-ichi Ogita for fruitful discussions. BamHI REFERENCES Fig. 3. Southern blot analysis of Do and J¿genes in ATL cells. Abscissa, patient numbers; lane G, control DNA from human placenta, linn lines, germ line band sizes [in kilobases (A'A)|.DNA samples have been digested with AVmilII restriction enzyme and hybridized with pMI19 probe. G 3 4 (Kb) G 5 (Kb) 8.4- 5.4-*»«» BamHI Sstl Fig. 4. Representative rearrangement pattern of the TCR «gene in ATL cells. Abscissa, patient numbers; lane G, human placenta! DNA as a germ line control. DNA samples have been digested with restriction enzymes and hybridized with a pMI3 probe as indicated. Thin lines near G, germ line band sizes [in kilobases (Kb)]. follicular lymphoma, respectively (34, 35). 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