Relation of Gene Expression Phenotype to Immunoglobulin Mutation Genotype in B Cell Chronic Lymphocytic Leukemia
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE3211 | GEO | 2005/08/27
SECONDARY ACCESSION(S): PRJNA92883
REPOSITORIES: GEO
Similar Datasets
Project description:The most common human leukemia is B cell chronic lymphocytic leukemia (CLL), a malignancy of mature B cells with a characteristic clinical presentation but a variable clinical course. The rearranged immunoglobulin (Ig) genes of CLL cells may be either germ-line in sequence or somatically mutated. Lack of Ig mutations defined a distinctly worse prognostic group of CLL patients raising the possibility that CLL comprises two distinct diseases. Using genomic-scale gene expression profiling, we show that CLL is characterized by a common gene expression "signature," irrespective of Ig mutational status, suggesting that CLL cases share a common mechanism of transformation and/or cell of origin. Nonetheless, the expression of hundreds of other genes correlated with the Ig mutational status, including many genes that are modulated in expression during mitogenic B cell receptor signaling. These genes were used to build a CLL subtype predictor that may help in the clinical classification of patients with this disease. Set of arrays organized by shared biological context, such as organism, tumors types, processes, etc. Computed
2005-08-27 | E-GEOD-3211 | biostudies-arrayexpress
Project description:The Journal of Experimental Medicine, Volume 194, Number 11, December 3, 2001 1639-1648 Relation of Gene Expression Phenotype to Immunoglobulin Mutation Genotype in B Cell Chronic Lymphocytic Leukemia Andreas Rosenwald1, Ash A. Alizadeh2, George Widhopf5, Richard Simon6, R. Eric Davis1, Xin Yu1, Liming Yang1, Oxana K. Pickeral1, Laura Z. Rassenti5, John Powell7, David Botstein3, John C. Byrd8, Michael R. Grever9, Bruce D. Cheson10, Nicholas Chiorazzi11, Wyndham H. Wilson12, Thomas J. Kipps5, Patrick O. Brown2,4 and Louis M. Staudt1 The most common human leukemia is B cell chronic lymphocytic leukemia (CLL), a malignancy of mature B cells with a characteristic clinical presentation but a variable clinical course. The rearranged immunoglobulin (Ig) genes of CLL cells may be either germ-line in sequence or somatically mutated. Lack of Ig mutations defined a distinctly worse prognostic group of CLL patients raising the possibility that CLL comprises two distinct diseases. Using genomic-scale gene expression profiling, we show that CLL is characterized by a common gene expression "signature," irrespective of Ig mutational status, suggesting that CLL cases share a common mechanism of transformation and/or cell of origin. Nonetheless, the expression of hundreds of other genes correlated with the Ig mutational status, including many genes that are modulated in expression during mitogenic B cell receptor signaling. These genes were used to build a CLL subtype predictor that may help in the clinical classification of patients with this disease.
2005-06-29 | E-SMDB-1002 | biostudies-arrayexpress
Project description:B-cell chronic lymphocytic leukemia (B-CLL) shows an incredibly high heterogeneity in the clinical course, spanning from rapidly aggressive to completely indolent behaviour. In order to identify the correspondent gene expression variability, we investigated 29 cases of untreated B-CLL using microarray. Firstly, two robust CLL clusters were identified applying multiple unsupervised clustering algorithms. Their separation was mainly determined by the differential expression of several genes included into two gene groups designated OxPhos and Lyn clusters. OxPhos gene cluster, previously identified in a subset of diffuse large B-cell lymphomas, comprises genes coding for some respiratory chain enzymes, ribosomal proteins and translation factors. Moreover, increased levels of genes involved in the regulation of apoptosis and in the proteasome-ubiquitin complex and the down-regulation of LYN gene, member of B-cell receptor pathway, characterized the OxPhos CLL subset. These B-CLL biological clusters did not reveal any preferential distribution of Ig mutated or Ig unmutated CLL prognostic groups. Furthermore, we applied another unsupervised algorithm (Subtractive Unsupervised Analysis) after the exclusion of genes characterizing the previously identified CLL subsets. At this point, we could identify two new CLL clusters, showing a clear association to the Ig mutational status. In addition to the ZAP-70 and LPL genes, the patients with unmutated Ig expressed higher level of some interesting genes involved in B cell activation, cell cycle regulation, apoptosis resistance and angiogenesis. In conclusion, we showed that B-CLL is characterized by an intrinsic heterogeneity in gene expression pattern, which overcomes the influence of the immunoglobulin mutational status on B-cell chronic lymphocytic leukemia profiles. Keywords: chronic lymphocytic leukemia, gene expressione profile, immunuglobulin mutational status, clinical heterogeneity
2006-02-25 | GSE4207 | GEO
Project description:The mutational status of the immunoglobulin heavy chain variable region (IGHV) defines two clinically distinct forms of chronic lymphocytic leukemia (CLL) known as mutated (M-CLL) and un-mutated (UM-CLL). To elucidate the molecular mechanisms underlying the adverse clinical outcome associated with UM-CLL, total proteomes from 9 UM-CLL and 9 M-CLL samples were analysed by isobaric tags for relative and absolute quantification (iTRAQ)-based mass spectrometry. Unsupervised clustering, based on the expression of 3521 identified proteins, separated CLL samples into two groups corresponding to IGHV mutational status. Computational analysis showed that 43 cell migration/adhesion pathways were significantly enriched by 39 differentially expressed proteins, 35 of which were expressed at significantly lower levels in UM-CLL samples. Furthermore, UM-CLL cells under-expressed proteins associated with cytoskeletal remodelling and over-expressed proteins associated with transcriptional and translational activity. Taken together, our findings indicated that UM-CLL cells are less migratory and more adhesive than M-CLL cells, resulting in their retention in lymph nodes where they are exposed to proliferative stimuli. In keeping with this hypothesis, analysis of an extended cohort of 120 CLL patients revealed a strong and specific association between UM-CLL and lymphadenopathy. Our study illustrates the potential of total proteome analysis to elucidate pathogenetic mechanisms in cancer.
2016-06-27 | PXD001515 | Pride
Project description:The mutational status of the immunoglobulin heavy chain variable region (IGHV) defines two clinically distinct forms of chronic lymphocytic leukemia (CLL) known as mutated (M-CLL) and un-mutated (UM-CLL). To elucidate the molecular mechanisms underlying the adverse clinical outcome associated with UM-CLL, total proteomes from 9 UM-CLL and 9 M-CLL samples were analysed by isobaric tags for relative and absolute quantification (iTRAQ)-based mass spectrometry. Unsupervised clustering, based on the expression of 3521 identified proteins, separated CLL samples into two groups corresponding to IGHV mutational status. Computational analysis showed that 43 cell migration/adhesion pathways were significantly enriched by 39 differentially expressed proteins, 35 of which were expressed at significantly lower levels in UM-CLL samples. Furthermore, UM-CLL cells under-expressed proteins associated with cytoskeletal remodelling and over-expressed proteins associated with transcriptional and translational activity. Taken together, our findings indicated that UM-CLL cells are less migratory and more adhesive than M-CLL cells, resulting in their retention in lymph nodes where they are exposed to proliferative stimuli. In keeping with this hypothesis, analysis of an extended cohort of 120 CLL patients revealed a strong and specific association between UM-CLL and lymphadenopathy. Our study illustrates the potential of total proteome analysis to elucidate pathogenetic mechanisms in cancer.
2016-06-27 | PXD001512 | Pride
Project description:The mutational status of the immunoglobulin heavy chain variable region (IGHV) defines two clinically distinct forms of chronic lymphocytic leukemia (CLL) known as mutated (M-CLL) and un-mutated (UM-CLL). To elucidate the molecular mechanisms underlying the adverse clinical outcome associated with UM-CLL, total proteomes from 9 UM-CLL and 9 M-CLL samples were analysed by isobaric tags for relative and absolute quantification (iTRAQ)-based mass spectrometry. Unsupervised clustering, based on the expression of 3521 identified proteins, separated CLL samples into two groups corresponding to IGHV mutational status. Computational analysis showed that 43 cell migration/adhesion pathways were significantly enriched by 39 differentially expressed proteins, 35 of which were expressed at significantly lower levels in UM-CLL samples. Furthermore, UM-CLL cells under-expressed proteins associated with cytoskeletal remodelling and over-expressed proteins associated with transcriptional and translational activity. Taken together, our findings indicated that UM-CLL cells are less migratory and more adhesive than M-CLL cells, resulting in their retention in lymph nodes where they are exposed to proliferative stimuli. In keeping with this hypothesis, analysis of an extended cohort of 120 CLL patients revealed a strong and specific association between UM-CLL and lymphadenopathy. Our study illustrates the potential of total proteome analysis to elucidate pathogenetic mechanisms in cancer.
2016-06-27 | PXD001516 | Pride
Project description:B-cell chronic lymphocytic leukemia (B-CLL) shows an incredibly high heterogeneity in the clinical course, spanning from rapidly aggressive to completely indolent behaviour. In order to identify the correspondent gene expression variability, we investigated 29 cases of untreated B-CLL using microarray. Firstly, two robust CLL clusters were identified applying multiple unsupervised clustering algorithms. Their separation was mainly determined by the differential expression of several genes included into two gene groups designated OxPhos and Lyn clusters. OxPhos gene cluster, previously identified in a subset of diffuse large B-cell lymphomas, comprises genes coding for some respiratory chain enzymes, ribosomal proteins and translation factors. Moreover, increased levels of genes involved in the regulation of apoptosis and in the proteasome-ubiquitin complex and the down-regulation of LYN gene, member of B-cell receptor pathway, characterized the OxPhos CLL subset. These B-CLL biological clusters did not reveal any preferential distribution of Ig mutated or Ig unmutated CLL prognostic groups. Furthermore, we applied another unsupervised algorithm (Subtractive Unsupervised Analysis) after the exclusion of genes characterizing the previously identified CLL subsets. At this point, we could identify two new CLL clusters, showing a clear association to the Ig mutational status. In addition to the ZAP-70 and LPL genes, the patients with unmutated Ig expressed higher level of some interesting genes involved in B cell activation, cell cycle regulation, apoptosis resistance and angiogenesis. In conclusion, we showed that B-CLL is characterized by an intrinsic heterogeneity in gene expression pattern, which overcomes the influence of the immunoglobulin mutational status on B-cell chronic lymphocytic leukemia profiles. SUBMITTER_CITATION: abstract in Blood, Volume 108, Issue 11 [2780] Angiopoietin-2 Expression in B-Cell Chronic Lymphocytic Leukemia: Association with Clinical Outcome and Immunoglobulin Heavy-Chain Mutational Status. "Rossana Maffei, Silvia Martinelli, Ilaria Castelli, Rita Santachiara, Elena Morandi, Patrizia Zucchini, Marcella Fontana, Anna Maria Colacci, Roberto Serra, Roberto Marasca, Giuseppe Torelli - Oncology and Hematology, University of Modena and Reggio Emilia, Modena, Italy; Excellence Environmental Carcinogenesis, ARPA, Bologna, Italy; Social, Cognitive and Quantitative Sciences, University of Modena and Reggio Emilia, Reggio Emilia, Ita Experiment Overall Design: Twenty-nine B-CLL patients, who have attended the haematology clinic of Modena Hospital, were enrolled in this study. Total RNA from mononuclear cells was isolated using RNeasy Mini Kit (QIAGEN, Valencia, CA, USA) according to the manufacturerâ??s instructions For all 29 specimens, fluorescently-labelled cRNA was generated by in vitro transcription using Low RNA Input Fluorescent Linear Amplification Kit (Agilent Technologies, Palo alto, CA, USA) according to the manufacturerâ??s instructions. Amplified cRNA of each patient was labelled with cyanine 5-CTP (Perkin-Elmer, NEN Life Science, Boston, MA, USA) in each experiment. Mix of equal amount of total RNAs from our cohort was used as reference control in all microarray gene-profiling experiments. Amplified reference cRNA was labelled with cyanine 3-CTP (Perkin-Elmer, NEN Life Science, Boston, MA, USA) in each experiment. Moreover, cRNA products were purified using RNeasy columns (Qiagen). 1 ï?g of Cy5-labelled cRNA was mixed with the same amount of Cy3-labelled reference cRNA and then mixed cRNAs were fragmented to an average size of ï?¾50-100 nt by incubation at 60°C for 30 min using in situ Hybridization kit-plus (Agilent). Samples were hybridized on Agilent Human 1A Oligo Microarray, ink-jet printed microarray, comprising 20,173 (60-mer) experimentally validated oligonucleotide probes (features).33 After hybridization for 17 h at 60°C, slides were washed according to Agilent SSC protocol instructions and then scanned using a confocal laser scanner (Agilent Technologies). Experiment Overall Design: Fluorescence data were analysed with Feature Extraction Software v.7.5 (Agilent Technologies). Log10 ratio of the dye-normalized Cy3 and Cy5 channel signals were calculated, then a p-value and a final error were obtained to establish the significance of each feature.
2008-06-12 | E-GEOD-4207 | biostudies-arrayexpress
Project description:Notwithstanding advances in the prognostication of chronic lymphocytic leukemia (CLL), it remains challenging to distinguish between patients with favorable and unfavorable treatment-free survival (TFS). Additionally, the downstream protein correlates of well-known molecular features of CLL are not always clear. To address this, we performed large-scale, unbiased characterization of global intracellular protein expression in a cohort of 40 CLL cases (patients with time to first treatment [TTFT] ≤24 months of sampling) and 40 age- and sex-matched CLL controls (patients with TTFT >24 months since sampling). Expression of 3268 proteins was quantified in the cohort. IGHV mutational status and trisomy 12 were most impactful on the CLL proteome. Intriguingly, comparing our results to three recently performed CLL mass-spectrometry screens, we identified four proteins that are strongly and consistently associated with IGHV mutational status: ZAP70, LMNA, FTL and FTH1. Additionally, we found that high intracellular protein levels of THEMIS2, a signaling protein acting downstream of the B-cell receptor, was significantly associated with short TTFT, independently of IGHV and TP53 mutational status (HR 2.47 [95%CI 1.54-3.95], P<0.01). This association was validated on the mRNA and protein level by qPCR and ELISA, respectivelly. Lastly, analysis of an independently generated CLL mass-spectrometry dataset verified the association between THEMIS2 expression and TFS (high THEMIS2, median TFS 4 months, versus low THEMIS2, median TFS not reached, P<0.0001)3. In conclusion, we present a comprehensive characterization of the proteome of untreated CLL. Of note, we identify elevated gene and protein expression of THEMIS2 as putative biomarker of inferior TTFT.
2023-10-24 | PXD036918 | Pride
Project description:Chronic lymphocytic leukemia (CLL) stereotyped subsets #6 and #8 include cases expressing unmutated B cell receptor immunoglobulin (BcR IG) (U-CLL). Yet, subset #6 (IGHV1-69/IGKV3-20) is less aggressive compared to subset #8 (IGHV4-39/IGKV1(D)-39) which has the highest risk for Richter’s transformation among all CLL. The underlying reasons for this divergent clinical behavior are not fully elucidated. To gain insight into this issue, here we focused on epigenomic signatures and their links with gene expression, particularly investigating genome-wide DNA methylation profiles in subsets #6 and #8 as well as other U-CLL cases not expressing stereotyped BcR IG using the Illumina 450k methylation arrays. Additionally we analysed the methylation profiles of naive and memory B cell subsets from healthy donors and compared them with those of the CLL cases.
2019-04-04 | E-MTAB-6955 | biostudies-arrayexpress
Project description:Chronic lymphocytic leukemia (CLL) stereotyped subsets #6 and #8 include cases expressing unmutated B cell receptor immunoglobulin (BcR IG) (U-CLL). Yet, subset #6 (IGHV1-69/IGKV3-20) is less aggressive compared to subset #8 (IGHV4-39/IGKV1(D)-39) which has the highest risk for Richter’s transformation among all CLL. The underlying reasons for this divergent clinical behavior are not fully elucidated. To gain insight into this issue, here we focused on their gene expression profiling and performed RNA-seq.
2019-04-04 | E-MTAB-6962 | biostudies-arrayexpress