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PubMed1992

PRAD1 (cyclin D1): a parathyroid neoplasia gene on 11q13.

Hyperparathyroidism is a central component of multiple endocrine neoplasia type 1 (MEN 1), and both sporadic and familial forms of parathyroid disease may share certain pathogenetic features. We recently identified a gene that is clonally rearranged with the PTH locus in a subset of sporadic parathyroid adenomas. This candidate oncogene, PRAD1 (previously D11S287), appears to contribute to parathyroid tumorigenesis in a fashion analogous to activation of C-MYC or BCL-2 by rearrangement with tissue-specific enhancers of the immunoglobulin genes in B-lymphoid neoplasia. The PRAD1 gene maps to 11q13 and has been linked to the BCL-1 breakpoint locus, although not to the most tightly linked MEN 1 markers, by pulsed field gel electrophoresis. PRAD1 may, in fact, be the long-sought BCL-1 lymphoma oncogene. PRAD1 encodes a novel type of cyclin protein and thus may normally function in controlling the cell cycle, perhaps through direct interaction with cdc2 or a related kinase. PRAD1's possible primary, or more likely secondary, involvement in the pathogenesis of MEN 1-related tumors is unknown and under investigation.

Amino Acid Sequence↗
PubMed1992

Direct sequence analysis of the t(14;18) chromosomal translocation in Hodgkin's disease.

There have been conflicting reports about the occurrence of the t(14;18) chromosomal translocation in Hodgkin's disease. A polymerase chain reaction analysis of biopsy specimens from 21 patients with Hodgkin's disease (HD) has shown the presence of the t(14;18) translocation in four cases (20%). All four patients had nodular sclerosing HD. Direct sequencing of the amplified 14q+ junctions established that the BCL-2 (major breakpoint region) sequence was fused to an Ig joining region (JH) (J6 in all four cases). Different breakpoints were observed in each case but were similar in nature to the breakpoints described in follicular lymphoma. The exact nature and cell of origin in HD remains obscure, although the presence of the t(14;18) translocation may reflect either a B-cell origin in these cases or associated lymphoid hyperplasia.

Adolescent↗
PubMed1992

Teniposide induces nuclear but not mitochondrial DNA degradation.

Teniposide [4'-demethylepipophyllotoxin-4-(4,6-O-thenylidene-beta-D- glucopyranoside) (VM-26)] is a cancer chemotherapeutic drug with a high target specificity for DNA topoisomerase II. This agent induces repairable protein-bridged double-strand DNA breaks, which have been correlated with cytotoxicity, but high concentrations of VM-26 also induce irreversible DNA degradation and apoptotic cell death. It is not known whether this degradation occurs uniformly throughout the genome or in a gene-specific manner. To answer this question, DNA was isolated from HL-60 promyelocytic leukemia cells exposed to 5 microM VM-26 for varying periods of up to 12 h. Nucleosomal "ladders" on 2.0% agarose gels stained with ethidium bromide were detectable after 3 h of exposure, indicative of apoptosis. Gene-specific DNA degradation was investigated by Southern blot analysis. The genes for 18S rRNA and glucose-6-phosphate dehydrogenase were representatives of constitutively expressed (i.e., "housekeeping") genes. The proto-oncogenes c-myc, c-Ha-ras, and bcl-2 were examined as examples of other transcriptionally active genes, while transcriptionally inactive genes in HL-60 cells were studied by probing for the immunoglobulin heavy chain joining region and lambda light chain constant region genes. The rates of DNA degradation, and its extent after 12 h, were similar for all nuclear genes studied. However, there was striking resistance of mitochondrial DNA to endonucleolytic degradation. These data demonstrate that VM-26 can elicit a widespread degradative process which affects nuclear but not mitochondrial DNA.

Blotting, Southern↗
PubMed1990

[Oncogenes and oncogene products--possibilities and significance of their detection].

Diagnosis- and/or prognosis-related alterations of (proto) oncogenes may be detected in neuroblastoma (N-myc), carcinoma of breast and ovary (HER2/neu), NHL (c-myc, bcl-2), CML (c-abl/bcr), and some other neoplasias. A wide variety of methods for the detection of gene alterations can be applied. The methods of detection have to be chosen according to the expected mechanisms of oncogene activation, the availability of adequately prepared tissue, and the technical standard of the laboratory. The sensitivity, specificity, and quantitation of morphological techniques (immunohistochemistry and in situ hybridization) is restricted and their results have to be interpreted most carefully. Whenever possible, at least two different techniques should be used, preferably on two different levels, i.e. RNA/DNA and protein. Furthermore, the combination of morphological and non morphological methods should be aspired.

Animals↗
PubMed1991

[Cytogenetic and molecular aspects in MALT lymphomas].

Cytogenetic and molecular results in 10 patients with extranodal lymphoma (MALT): 5 low grade and 5 high grade, were compared with the results observed in nodal lymphomas. This study suggests that there are cytogenetic differences between extranodal and nodal low grade lymphomas. Both molecular analysis by conventional Southern blot with probes for the major and minor regions of bcl-2 gene, and PCR analysis with primers from these regions, showed that t (14; 18) is a sporadic event in MALT lymphomas.

Aneuploidy↗
PubMed1991

[Identification and localization on chromosome 1 of a gene controlling the occurrence of periinsulitis in NOD diabetic mice].

Diabetic NOD (Non Obese Diabetic) mice show early pancreatic infiltration of mononuclear cells around Langerhans islets (periinsulitis). Study of (NOD x C57BL/6) F1 and F2 mice reveals that periinsulitis is constantly associated with a similar infiltration of salivary glands (sialitis) and is controlled by a dominant susceptibility locus. Segregation analysis of periinsulitis and microsatellite DNA markers indicates that the gene controlling periinsulitis maps to chromosome 1, close to the Bcl-2 locus.

Animals↗
PubMed1991

Mouse bcl-3: cDNA structure, mapping and stage-dependent expression in B lymphocytes.

Human B-cell chronic lymphocytic leukemias (CLLs) are malignancies of mature B lymphocytes. A subset of these tumors is associated with a non-random t(14; 19) translocation (Ueshima et al., 1985). Recently a gene (bcl-3) has been identified in the region adjacent to the chromosome 19 breakpoint in this translocation (McKeithan et al., 1987; Ohno et al., 1990). We now report the isolation of cDNA clones of mouse bcl-3. The mouse bcl-3-coding region is 1746 bp long and exhibits 80% identity with human bcl-3 at both the nucleotide and amino acid level. The bcl-3 locus maps to the proximal end of mouse chromosome 7, which is syntenic to human chromosome 19. The bcl-3 probe readily detects particularly abundant amounts of a 1.8 kb mRNA in mouse tumors consisting of follicular center mature B cells and large pre-B cells, but not in small pre-B cells. The bcl-3 pattern of expression is distinctive in the spectrum of B-cell maturation in that bcl-3 transcripts are particularly abundant in B-cell lines immortalized just prior to Ig switch. The bcl-3 pattern of expression also bears close resemblance to that of bcl-2 (Gurfinkel et al., 1987), which is frequently associated with human B follicular lymphomas [t(14; 18)] and some chronic lymphocytic leukemias (Adachi et al., 1989; 1990; Adachi & Tsujimoto, 1989).

Amino Acid Sequence↗
PubMed1991

Rearrangement of the chromosome 11 bcl-1 locus in centrocytic lymphoma: analysis with multiple breakpoint probes.

Centrocytic lymphoma is a B-cell non-Hodgkin's lymphoma (NHL) composed of lymphocytes resembling cleaved follicular center cells (centrocytes). Previous studies have suggested an association between t(11;14) chromosomal translocations and bcl-1 rearrangement in centrocytic and related intermediate lymphocytic lymphomas. To further characterize the association between bcl-1 and centrocytic lymphoma, Southern blot analysis was performed on samples from 23 patients using four separate bcl-1 breakpoint probes spanning 63 kb of the chromosome 11 bcl-1 locus. Rearrangements were identified in six patients with the major translocation cluster (MTC) probe and in another six with probe p94PS, located about 24 kb 5' of MTC. Eleven of these 12 cases showed comigration of rearranged bcl-1 and Ig heavy chain-joining genes, consistent with the t(11;14) chromosomal translocation. No rearrangements were observed with the bcl-1 locus probes p210 or p11EH located 5' of p94PS, nor with bcl-2 or c-myc oncogene probes. No bcl-1 rearrangements were identified in B-cell follicular NHL (15), small noncleaved cell (Burkitt's and non-Burkitt's) NHL (8), T-cell NHL (4), multiple myeloma (14), and pre-B-cell acute lymphoblastic leukemia (9). One of 23 B-cell NHL of large cell type and one of 19 chronic lymphocytic leukemias or small lymphocytic NHL had MTC rearrangement. Thus, bcl-1 rearrangement occurred at MTC or p94PS in 12 of 23 centrocytic lymphomas (52%), confirming a nonrandom association and suggesting a pathogenetic role for the bcl-1 locus in this immunohistologic subtype of NHL.

Blotting, Southern↗
PubMed1990

[Polymerase chain reaction (PCR)--a novel tool for the molecular diagnosis of neoplasms].

Polymerase chain reaction (PCR) is a novel tool for the in vitro amplification of DNA segments up to several kb. Repeated cycles of DNA synthesis by heat-stable Taq DNA polymerase enables to obtain more than 10(5) copies of the target sequence. Recently its enormous attitude of amplification has been applied for the detection of tumor-specific gene alterations. Examples include the detection of point mutation of RAS oncogenes at codons 12, 13, and 61 and the detection of minimal residual neoplastic cells in patients in complete clinical remission. Among many kinds of tumor specific gene translocations, BCR-ABL gene in t(9;22)(q34;q11) and BCL-2-IgH gene in t(14:18)(q32;q21) have been successfully PCR-amplified around their fused regions. In lymphoid malignancies gene rearrangements of T cell receptor chain or immunoglobulin heavy chain can be used as clonal markers for leukemic cells. PCR technique permits the detection of leukemia DNA at dilution of 10(-4) to 10(-6). Although further investigation of patients' follow-up in large scale is needed, this technique seems to hold promise for the monitoring of residual neoplastic cells.

Animals↗
PubMed1990

A murine model for B-cell lymphomagenesis in immunocompromised hosts: c-myc-rearranged B-cell lines with a premalignant phenotype.

Activation of c-myc or bcl-2 protooncogene is a common event in B-cell lymphomagenesis. Alone, each is insufficient to produce lymphoma, prompting the search for the additional steps required to complete the malignant phenotype. Among the existing systems of murine or human B-cell neoplasia, no commonly occurring complementary oncogenic activation has been found. This study introduces a new series of murine B-cell lines with a phenotype suggesting that such additional events might not involve intrinsic growth control, but instead host immune mechanisms which normally suppress tumorigenicity of premalignant B-cells. Four murine B-cell lines were isolated from the long-term culture of normal lymphoid tissue bearing a premalignant phenotype. (a) Their phenotype resembled naturally occurring lymphoid tumors of immunocompromised hosts with regard to c-myc activation, aberrant or absent immunoglobulin expression, preferential rearrangement of the lambda light chain locus, and a distinctive pattern of tissue invasion and tumor histology. (b) Their tumorigenicity was strictly dependent on host permissiveness correlated with immunodeficient status: C.B-17-scid greater than BALB/c-nu/nu greater than normal BALB/c much greater than other H-2d strains (NZB x NZW F1, NZB, DBA/2). (c) Host passage selected for malignant variants distinguished by a 10(4)-fold increase in tumorigenicity (as judged by limiting cell dose) and by novel tumorigenicity in nonpermissive syngeneic hosts. These features are analogous to properties of human lymphomas arising in immunocompromised states and, to our knowledge, unique among previously reported murine B-cell lines.

Animals↗
PubMed1990

A new human B-cell non-Hodgkin's lymphoma cell line (Karpas 422) exhibiting both t (14;18) and t(4;11) chromosomal translocations.

A unique B-cell non-Hodgkin's lymphoma (NHL) cell line (Karpas 422), bearing both t(14;18) and t(4;11) chromosomal translocations as well as several other chromosomal abnormalities, has been established from the pleural effusion of a patient with chemotherapy-resistant NHL. This cell line has the same karyotypic features as malignant cells from the patient. The major cell clone is characterized chromosomally by 46,XX t(2;10)(p23;q22.1), t(4;11)(q21.3; q23.1), t(14;18)(q32.1;q21.3), t(4;16)(q21.3;p13.1). Both phenotypically and genotypically, the cell line has features of a mature B-cell neoplasm with no evidence for commitment to other lineages. Rearrangements of the C-ETS-1 oncogene and N-CAM-1 and CD3 genes that map to 11q23 were not detected by conventional Southern analysis. BCL-2 was rearranged within the major breakpoint cluster. The K422 cell line has a unique karyotype; this is the first occasion that the t(4;11) translocation has been described in a t(14;18) lymphoma. The cell line will be of value in determining the molecular nature of the t(4;11) translocation.

Antigens, CD↗
PubMed1990

[Characteristics of B-cell lymphoma in Japan].

Consecutive 431 patients with B-cell lymphoma seen in Aichi Cancer Center Hospital from 1964 to 1988 were analysed. Median age was 56 yr (range 8-86). There were 76 patients (17.6%) with follicular lymphoma and 355 with diffuse lymphoma. Among the 30 patients with follicular lymphoma, 10 (33%) were found to have a bcl-2 rearrangement. The incidence was lower than those reported in the United States. This might contribute to the lower incidence of follicular lymphoma cases in Japan. There were 168 patients (39.0%) with nodal lymphoma and 263 with extranodal lymphoma. Eight-four cases arose from the stomach, 84 from Waldeyer's ring, 21 small intestine and 13 thyroid. The distributions of extranodal B-cell lymphoma differed from those of T-cell lymphoma. Patients with gastric lymphomas in stage I were treated with resection alone. In the same manner, patients with Waldeyer's ring lymphoma in stage I were treated with radiotherapy alone. More than 90% of these patients were expected to survive without relapse. On the other hand, only 55% of patients with nodal lymphoma in stage I were expected to survive for more than 10 years. These findings suggest the site of localized lymphoma is an important determinant of outcome of clinical behavior.

Adolescent↗
PubMed1989

Nonrandom rearrangement of chromosome 14 at band q32.33 in human lymphoid malignancies with mature B-cell phenotype.

Chromosomes were studied in 61 patients with differentiated B-cell malignancies including 21 with non-Hodgkin's lymphoma (NHL), three with hairy cell leukemia (HCL), eight with Waldenström's macroglobulinemia (WM), and 29 with plasma cell disorder. Chromosomally abnormal clones were identified in 35 of 61 patients studied: all with NHL, all with HCL, three of eight with WM, and eight of 29 with plasma cell disorder. The most recurrent chromosomal abnormality, observed in 26 of the 35 patients whose chromosomes were abnormal, was a rearrangement involving chromosome 14, in which an additional segment was attached at band 32 in the long arm to form a 14q+ marker chromosome. This rearrangement was seen in 17 patients with NHL, three with HCL, one with WM, and five with plasma cell disorder. In NHL, the rearrangement correlates with histological subclasses: t(14;18) in all four patients with malignant lymphoma (ML)-follicular, mixed small cleaved and large cell; t(8;14) or its variant form, t(8;22), in all six with ML-small noncleaved cell; and t(11;14) in two of three with ML-diffuse, mixed small and large cell. A t(14;18) was also found in each patient with ML-diffuse, large cell, WM, and multiple myeloma, and a variant three-way translocation, t(5;18;14) (q13;q21;q32), in one with ML-diffuse, small cleaved cell. The donor sites for these 14q+ were assigned to oncogene loci: c-myc (8q24), bcl-1 (11q13), and bcl-2 (18q21). Moreover, the donor sites were also located near immunoglobulin light chain gene loci in each patient with leukemic ML-diffuse, mixed small and large cell, t(2;14) (p13;q32.3), and HCL, t(14;22)(q32.3;q11.2). These findings suggest that chimeric DNA formation, not only between an immunoglobulin gene and a certain oncogene, but also between the IgH gene and one of the IgL genes may be potentially relevant in malignant B-cell proliferation.

Adult↗
PubMed1989

The transgenic window on lymphoid malignancy.

Transgenic mice bearing an oncogene targetted for expression in a specific tissue can reveal how that oncogene influences differentiation and help to delineate the pathways to malignancy. To explore lymphoid neoplasia, we have made strains of transgenic mice bearing different oncogenes driven by the immunoglobulin heavy chain enhancer (E mu), which promotes expression within lymphocytes and certain myeloid cells. The prototype E mu-myc mice succumb to pre-B and B cell lymphomas, following a preneoplastic phase in which cycling pre-B cells are overproduced. The similar fate of E mu-N-myc mice suggests that N-myc and myc have overlapping functions. Surprisingly, E mu-N-ras mice develop T lymphomas and macrophage tumours but no B lineage tumours; thus the ability of ras to initiate tumorigenesis may be lineage specific. Similarly, the high predisposition of E mu-v-abl mice to develop plasmacytomas may indicate that v-abl is oncogenic only at certain stages of B cell maturation. The bcl-2 gene promotes cell survival rather than proliferation, and E mu-bcl-2 mice produce copious resting B lymphocytes. The random onset and monoclonality of tumours in the transgenic strains argues for spontaneous genetic alterations that cooperate with the trans-oncogene. Indeed, most plasmacytomas of E mu-v-abl mice bear spontaneous myc rearrangements. Moreover, a minority of E mu-myc B lymphomas exhibit ras mutation, and the tumorigenesis can be reconstructed by crossing E mu-myc and E mu-ras mice, or by retroviral delivery of v-ras or v-raf, either in vitro or in vivo. To access novel cooperating oncogenes, we are using a retrovirus lacking an oncogene as an insertional mutagen. This approach should be applicable to any trans-oncogenic strain and help to delineate the genetic events that trigger malignant clones.

Animals↗
PubMed1987

Refinement of lymphoma cytogenetics by the chromosome 18q21 major breakpoint region.

A small (2.8-kilobase, kb) major breakpoint region localized to segment 18q21 rearranges in greater than 70% of t(14;18)(q32;q21) lymphomas. This rearrangement interrupts the Bcl-2 gene and introduces it into the Ig locus at 14q32. The rearrangement between the joining region (JH) of Ig on chromosome 14 and the 18q21 region creates a translocation-specific DNA rearrangement. We generated probes that distinguish the 14;18 juncture on the derivative (der) 14 and der (18) chromosomes, providing a molecular approach to t(14;18) identification. Approximately 60% of unselected follicular lymphomas, 20% of diffuse large cell lymphomas, and 50% of adult undifferentiated non-Burkitt lymphomas demonstrated 14;18 rearrangements within the major breakpoint region. Examination of DNA for 14;18 rearrangements resolved the identity of 14q+ chromosomes in two patient's cells that lacked an obvious reciprocal partner. Identification of the exact restriction fragments that mediate translocations complements routine cytogenetics. The detection of DNA rearrangements does not require dividing cells or the presence of an identifiable reciprocal partner and can detect clonal translocation rearrangements when the neoplastic cells are only a minority of all cells present.

Chromosome Banding↗
PubMed1988

[Recent progress in non-Hodgkin's lymphoma study in Japan].

Great progress has been made in clinical research on non-Hodgkin's lymphoma during the last 15 years. Surface marker and DNA analyses of immunoglobulin and T-cell receptor genes are essential for new classification of the disease according to the cellular origin of tumor cells. This approach resulted in the establishment of new disease entities such as adult T-cell leukemia/lymphoma(ATL), immunoblastic lymphoadenopathy (IBL)-like T-cell lymphoma, and the pleural B-lymphoma occurring in long-standing pyothorax. New retrovirus, HTLV-I, was found during studies on ATL. Prevention of HTLV-I infection is an important project. HTLV-I negative ATL was also found and is of particular interest in understanding leukemogenesis of ATL. An oncogen such as bcl-2 is important for characterization of follicular lymphoma. Prognostic factors of patients with T-lymphoma are completely different from those of B-lymphoma. Risk grouping by combination of major prognostic factors is useful for the selection of the best treatment modality and the accurate estimation of prognosis of patients at initial presentation. The effect of combination chemotherapy should be evaluated separately between T- and B-lymphomas because of the difference in response rate and prognostic factors.

B-Lymphocytes↗
PubMed2026

Suppression of HIV-1 replication in CEM-A cell cultures by trans-splicing group I introns targeting PAS/PBS sequences and conditionally expressing ΔN-Bax.

Anti-HIV group I introns containing antisense guide sequences directed against the HIV-1 primer activation signal and primer-binding site (PAS/PBS) were designed and evaluated. Because PAS/PBS sequences are present in the viral RNA species examined, these RNAs can serve as trans-splicing substrates. The introns were active against both artificial target RNAs and viral RNA generated during infection. Cleavage and degradation of targeted viral RNA may have contributed to suppression, whereas inclusion of a 3' exon encoding the proapoptotic protein ΔN-Bax was associated with increased programmed cell death and may have augmented suppression of viral replication. In cultured CEM-A cells, transgene expression of these introns markedly suppressed HIV-1 replication, with p24 levels falling below the assay detection limit in selected clones. RESULTS: RT-PCR and sequence analysis detected splice products containing the expected PAS/PBS junctions. In the dual-luciferase assay, intron expression reduced normalized Gaussia luciferase signal by approximately 70% relative to the negative control. Qualitative Annexin V imaging and caspase-3 assays were consistent with infection-dependent apoptosis after ΔN-Bax splice-product formation. Transient expression of each intron in HEK293T cells followed by infection with VSV-G-pseudotyped HIV-1NL4-3 at an MOI of 2 reduced p24 levels by approximately 50% at 4 days post-infection. Construct 128L produced the strongest RT-PCR band under the tested conditions and was selected for subsequent experiments. A canonical splice product and a low-abundance noncanonical splice product were detected; both involved the intended HIV-derived target RNA, although transcriptome-wide off-target splicing was not assessed. Heterogeneous transformed HEK293T populations showed an approximately 2-log10 reduction in p24. In selected clonal HEK293T and CEM-A lines, p24 was below the assay detection limit at the measured endpoints, including up to 90 days after infection in some CEM-A clones. CONCLUSIONS: PAS/PBS-targeting group I introns suppressed HIV-1-associated p24 production in the tested cell-culture models. Linking the introns to a ΔN-Bax 3' exon was associated with infection-dependent apoptosis and may further limit viral replication and spread. The use of highly conserved, functionally constrained target sequences may reduce the likelihood of escape, but viral evolution and transcriptome-wide off-target effects were not assessed. This conditional death-upon-infection strategy warrants further evaluation in primary-cell and in vivo models.

Humans↗
PubMed2026

Overlapping genetic etiology of pediatric and adult germ cell tumors.

BACKGROUND: Germ cell tumors are heterogeneous neoplasms arising from primordial germ cells. Although genome-wide association studies have identified numerous susceptibility loci for adult testicular germ cell tumors, the heritable basis of pediatric testicular germ cell tumors and germ cell tumors that arise outside the testes remain poorly understood. METHODS: We conducted a multi-ancestry genome-wide association study of pediatric germ cell tumors, including 1927 cases from the Germ Cell Tumor Epidemiology Study and 10 601 controls. Cases were diagnosed with testicular (n = 678), ovarian (n = 441), intracranial (n = 435), and extragonadal (n = 373) germ cell tumor between the ages of 0 and 19 years. RESULTS: We identified 4 loci reaching genome-wide significance, including variants near BAK1 (chr 6: rs3831846), SPRY4 (chr 5: rs12515244), DMRT1 (chromosome [chr] 9: rs10815910), and DEPTOR (chr 8: rs13277786). Additional genome-wide statistically significant associations were identified in subgroup analyses, including 6 loci for intracranial germ cell tumors (rs2758612 [PMF1/BGLAP], rs9854760 [PLCL2], rs6851498 [KIT], rs11816992 on chromosome 10, rs3830273 [TFAM], and rs13054014 [LZTR1]), 1 locus for testicular germ cell tumor (rs1907702 [KITLG]), and 1 locus for males (rs4610628 [MAD1L1]). After Bonferroni correction, 18 of 78 previously reported testicular germ cell tumor loci were significantly associated with germ cell tumor overall or in at least 1 subgroup with a particularly strong correlation between testicular germ cell tumor and intracranial germ cell tumor effect estimates (rho = 0.63, P = 5.5 × 10-10). Expression quantitative trait locus (QTL) analyses identified candidate genes in the regions identified on chromosome 6 (BAK1, LINC003366, and ITPR3) and chromosome 8 (DEPTOR and RP11-760H22.2). CONCLUSIONS: Our data support a role for germline genetic variation in the development of germ cell tumors in locations outside the testes and highlight shared genetic architecture across age group and tumor location.

Humans↗