UCAGenomiX related publications

Du to our strong expertise in "omics" experiments and in microRNAs topics we decided to separate into 3 categories the related publications into which the Functional genomics Platform of Nice-Sophia-Antipolis is involved :
  1. Expression studies (DNA microarrays and high-throughput sequencing experiments)
  2. MicroRNA studies
  3. Miscellaneous

Paquet Agnes

 04 93 95 77 92
 660 route des lucioles 06560 Valbonne - Sophia-Antipolis

17 publications found

1. CDC20B is required for deuterosome-mediated centriole production in multiciliated cells
Nat Commun. 2018 Nov 7;9(1):4668. doi: 10.1038/s41467-018-06768-z.
Revinski DR, Zaragosi LE, Boutin C, Ruiz-Garcia S, Deprez M, Thomé V, Rosnet O, Gay AS, Mercey O, Paquet A, Pons N, Ponzio G, Marcet B, Kodjabachian L, Barbry P
Aix Marseille Univ, CNRS, IBDM, Marseille, France. Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis, France. Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis, France. marcet@ipmc.cnrs.fr. Aix Marseille Univ, CNRS, IBDM, Marseille, France. laurent.kodjabachian@univ-amu.fr. Université Côte d'Azur, CNRS, IPMC, Sophia-Antipolis, France. barbry@ipmc.cnrs.fr.

Multiciliated cells (MCCs) harbor dozens to hundreds of motile cilia, which generate hydrodynamic forces important in animal physiology. In vertebrates, MCC differentiation involves massive centriole production by poorly characterized structures called deuterosomes. Here, single-cell RNA sequencing reveals that human deuterosome stage MCCs are characterized by the expression of many cell cycle-related genes. We further investigated the uncharacterized vertebrate-specific cell division cycle 20B (CDC20B) gene, which hosts microRNA-449abc. We show that CDC20B protein associates to deuterosomes and is required for centriole release and subsequent cilia production in mouse and Xenopus MCCs. CDC20B interacts with PLK1, a kinase known to coordinate centriole disengagement with the protease Separase in mitotic cells. Strikingly, over-expression of Separase rescues centriole disengagement and cilia production in CDC20B-deficient MCCs. This work reveals the shaping of deuterosome-mediated centriole production in vertebrate MCCs, by adaptation of canonical and recently evolved cell cycle-related molecules.
Pubmed link : 30405130

2. New Insights Into the Role of Cav2 Protein Family in Calcium Flux Deregulation in Fmr1-KO Neurons.
Front Mol Neurosci. 2018 Sep 27;11:342
Castagnola S, Delhaye S, Folci A, Paquet A, Brau F, Duprat F, Jarjat M, Grossi M, Béal M, Martin S, Mantegazza M, Bardoni B, Maurin T
Université Côte d'Azur, CNRS UMR7275, IPMC, Valbonne, France. CNRS LIA "Neogenex", Valbonne, France. Université Côte d'Azur, INSERM, CNRS UMR7275, IPMC, Valbonne, France.

Fragile X syndrome (FXS), the most common form of inherited intellectual disability (ID) and a leading cause of autism, results from the loss of expression of the Fmr1 gene which encodes the RNA-binding protein Fragile X Mental Retardation Protein (FMRP). Among the thousands mRNA targets of FMRP, numerous encode regulators of ion homeostasis. It has also been described that FMRP directly interacts with Ca2+ channels modulating their activity. Collectively these findings suggest that FMRP plays critical roles in Ca2+ homeostasis during nervous system development. We carried out a functional analysis of Ca2+ regulation using a calcium imaging approach in Fmr1-KO cultured neurons and we show that these cells display impaired steady state Ca2+ concentration and an altered entry of Ca2+ after KCl-triggered depolarization. Consistent with these data, we show that the protein product of the Cacna1a gene, the pore-forming subunit of the Cav2.1 channel, is less expressed at the plasma membrane of Fmr1-KO neurons compared to wild-type (WT). Thus, our findings point out the critical role that Cav2.1 plays in the altered Ca2+ flux in Fmr1-KO neurons, impacting Ca2+ homeostasis of these cells. Remarkably, we highlight a new phenotype of cultured Fmr1-KO neurons that can be considered a novel cellular biomarker and is amenable to small molecule screening and identification of new drugs to treat FXS.
Pubmed link : 30319351

3. The "one airway, one disease" concept in light of Th2 inflammation.
Eur Respir J. 2018 Sep 6. pii: 1800437. doi: 10.1183/13993003.00437-2018.
Giovannini-Chami L, Paquet A, Sanfiorenzo C, Pons N, Cazareth J, Magnone V, Lebrigand K, Chevalier B, Vallauri A, Julia V, Marquette CH, Marcet B, Leroy S, Barbry P
Université Côte d'Azur, Hôpitaux pédiatriques de Nice CHU-Lenval, Pediatric Pulmonology and Allergology Department, Nice, France. Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire, Sophia Antipolis, France. Université Côte d'Azur, CHU de Nice, FHU Oncoage, Pulmonology Department, Nice, France.

In line with the pathophysiological continuum described between nose and bronchus in allergic respiratory diseases, we assessed whether nasal epithelium could mirror the Th2 status of bronchial epithelium.Nasal and bronchial cells were collected by brushings from patients with allergic rhinitis and asthma (AR, n=12), isolated allergic rhinitis (R, n=14) and healthy controls (C, n=13). Cellular composition was assessed by flow cytometry. Gene expression was analysed by RNA sequencing. Th2, Th17 and interferon signatures were derived from the literature.Infiltration by polymorphonuclear neutrophils in nose excluded 30% of the initial cohort. All bronchial samples from AR group were Th2-high. Nasal samples gene expression profile from the AR group correctly predicted the paired bronchial sample Th2 status in 71% of cases. Nevertheless, nasal cells did not appear as a reliable surrogate of the Th2 response, in particular due to a more robust influence of the interferon response in 14/26 nasal samples. Th2 scores correlated with mast cells counts (p<0.001) and numbers of sensitizations (p=0.006 and 0.002), while Th17 scores correlated with PMN counts (p<0.014).The large variability in nasal cell composition and type of inflammation restricts its use as a surrogate for assessing bronchial Th2 inflammation in AR patients.
Pubmed link : 30190271

4. The stem cell-associated gene expression signature allows risk stratification in pediatric acute myeloid leukemia.
Leukemia. 2018 Aug 8. doi: 10.1038/s41375-018-0227-5.
Duployez N, Marceau-Renaut A, Villenet C, Petit A, Rousseau A, Ng SWK, Paquet A, Gonzales F, Barthélémy A, Leprêtre F, Pottier N, Nelken B, Michel G, Baruchel A, Bertrand Y, Leverger G, Lapillonne H, Figeac M, Dick JE, Wang JCY, Preudhomme C, Cheok M
Laboratory of Hematology, CHU Lille, Lille, France. nicolas.duployez@chru-lille.fr.

Despite constant progress in prognostic risk stratification, children with acute myeloid leukemia (AML) still relapse. Treatment failure and subsequent relapse have been attributed to acute myeloid leukemia-initiating cells (LSC), which harbor stem cell properties and are inherently chemoresistant. Although pediatric and adult AML represent two genetically very distinct diseases, we reasoned that common LSC gene expression programs are shared and consequently, the highly prognostic LSC17 signature score recently developed in adults may also be of clinical interest in childhood AML. Here, we demonstrated prognostic relevance of the LSC17 score in pediatric non-core-binding factor AML using Nanostring technology (ELAM02) and RNA-seq data from the NCI (TARGET-AML). AML were stratified by LSC17 quartile groups (lowest 25%, intermediate 50% and highest 25%) and children with low LSC17 score had significantly better event-free survival (EFS: HR = 3.35 (95%CI = 1.64-6.82), P < 0.001) and overall survival (OS: HR = 3.51 (95%CI = 1.38-8.92), P = 0.008) compared with patients with high LSC17 scores. More importantly, the high LSC17 score was an independent negative EFS and OS prognosticator determined by multivariate Cox model analysis (EFS: HR = 3.42 (95% CI = 1.63-7.16), P = 0.001; OS HR = 3.02 (95%CI = 1.16-7.85), P = 0.026). In conclusion, we have demonstrated the broad applicability of the LSC17 score in the clinical management of AML by extending its prognostic relevance to pediatric AML.
Pubmed link : 30089916

5. Effect of mutant variants of the KRAS gene on PD-L1 expression and on the immune microenvironment and association with clinical outcome in lung adenocarcinoma patients
Lung Cancer. 2018 Jul;121:70-75.
Falk AT, Yazbeck N, Guibert N, Chamorey E, Paquet A, Ribeyre L, Bence C, Zahaf K, Leroy S, Marquette CH, Cohen C, Mograbi B, Mazières J, Hofman V, Brest P, Hofman P, Ilié M
Université Côte d'Azur, CNRS UMR7284, INSERM U1081, IRCAN Team 4, FHU OncoAge, Nice, France; Antoine Lacassagne Comprehensive Cancer Center, FHU OncoAge, Department of Radiation Oncology, Nice, France.

OBJECTIVES: The effect of anti-PD-1/PD-L1 inhibitors on lung adenocarcinomas (LADCs) with KRAS mutations is debatable. We examined the association between specific mutant KRAS proteins and the immune infiltrates with the outcome of patients with LADCs. PATIENTS AND METHODS: In 219 LADCs harboring either wild-type (WT) or mutated KRAS gene, we quantified the density of several immune markers by immunohistochemistry followed by automated digital image analysis. Data were correlated to clinicopathological parameters and outcome of patients. RESULTS: Tumors harboring mutant KRAS-G12 V had a significantly higher PD-L1 expression compared to other tumors (p = 0.044), while mutant KRAS-G12D tumors showed an increase in the density of CD66b+ cells (p = 0.001). High PD-L1 expression in tumor cells was associated to improved overall survival (OS) in KRAS mutant patients (p = 0.012), but not in the WT population (p = 0.385), whereas increased PD-L1 expression in immune cells correlated to poor OS of KRAS-WT patients (p = 0.025), with no difference in patients with KRAS mutations. CONCLUSIONS: KRAS mutational status can affect the immune microenvironment and survival of LADC patients in a heterogeneous way, implying that specific mutant KRAS variants expressed by the tumor should be considered when stratifying patients for immunotherapy.
Pubmed link : 29858030

6. CD4+ T Cells Have a Permissive Effect on Enriched Environment-Induced Hippocampus Synaptic Plasticity.
Front Synaptic Neurosci. 2018 Jun 13;10:14. doi: 10.3389/fnsyn.2018.00014. eCollection 2018.
Zarif H, Hosseiny S, Paquet A, Lebrigand K, Arguel MJ, Cazareth J, Lazzari A, Heurteaux C, Glaichenhaus N, Chabry J, Guyon A, Petit-Paitel A
Université Côte d'Azur, CNRS, IPMC, Nice, France. Université Côte d'Azur, INSERM, IPMC, Nice, France. Université Côte d'Azur, INSERM, C3M, IPMC, Nice, France.

Living in an enriched environment (EE) benefits health by acting synergistically on various biological systems including the immune and the central nervous systems. The dialog between the brain and the immune cells has recently gained interest and is thought to play a pivotal role in beneficial effects of EE. Recent studies show that T lymphocytes have an important role in hippocampal plasticity, learning, and memory, although the precise mechanisms by which they act on the brain remain elusive. Using a mouse model of EE, we show here that CD4+ T cells are essential for spinogenesis and glutamatergic synaptic function in the CA of the hippocampus. However, CD4+ lymphocytes do not influence EE-induced neurogenesis in the DG of the hippocampus, by contrast to what we previously demonstrated for CD8+ T cells. Importantly, CD4+ T cells located in the choroid plexus have a specific transcriptomic signature as a function of the living environment. Our study highlights the contribution of CD4+ T cells in the brain plasticity and function.
Pubmed link : 29950983

7. HITS-CLIP in various brain areas reveals new targets and new modalities of RNA binding by fragile X mental retardation protein
Nucleic Acids Res. 2018 Apr 14. doi: 10.1093/nar/gky267
Maurin T, Lebrigand K, Castagnola S, Paquet A, Jarjat M, Popa A, Grossi M, Rage F, Bardoni B
Université Côte d'Azur, CNRS, IPMC, 06560 Valbonne, France. CNRS LIA « Neogenex », 06560 Valbonne, France. Research Center for Molecular Medicine of the Austrian Academy of Sciences, A-1090 Vienna, Austria. CNRS, Institut de Génétique Moléculaire, 34293 Montpellier, France. Université Côte d'Azur, INSERM, CNRS, IPMC, 06560 Valbonne, France.

Fragile X syndrome (FXS), the most common form of inherited intellectual disability, is due to the functional deficiency of the fragile X mental retardation protein (FMRP), an RNA-binding protein involved in translational regulation of many messenger RNAs, playing key roles in synaptic morphology and plasticity. To date, no effective treatment for FXS is available. We searched for FMRP targets by HITS-CLIP during early development of multiple mouse brain regions (hippocampus, cortex and cerebellum) at a time of brain development when FMRP is most highly expressed and synaptogenesis reaches a peak. We identified the largest dataset of mRNA targets of FMRP available in brain and we defined their cellular origin. We confirmed the G-quadruplex containing structure as an enriched motif in FMRP RNA targets. In addition to four less represented motifs, our study points out that, in the brain, CTGKA is the prominent motif bound by FMRP, which recognizes it when not engaged in Watson-Crick pairing. All of these motifs negatively modulated the expression level of a reporter protein. While the repertoire of FMRP RNA targets in cerebellum is quite divergent, the ones of cortex and hippocampus are vastly overlapping. In these two brain regions, the Phosphodiesterase 2a (Pde2a) mRNA is a prominent target of FMRP, which modulates its translation and intracellular transport. This enzyme regulates the homeostasis of cAMP and cGMP and represents a novel and attractive therapeutic target to treat FXS.
Pubmed link : 29668986

8. Tacrolimus-induced nephrotoxicity in mice is associated with microRNA deregulation
Arch Toxicol. 2018 Jan 23. doi: 10.1007/s00204-018-2158-3
Vandenbussche C, Van der Hauwaert C, Dewaeles E, Franczak J, Hennino MF, Gnemmi V, Savary G, Tavernier Q, Nottet N, Paquet A, Perrais M, Blum D, Mari B, Pottier N, Glowacki F, Cauffiez C
EA 4483-IMPECS-IMPact of Environmental ChemicalS on Human Health, Faculté de Médecine/Pôle Recherche, Univ. Lille, 1, place de Verdun, 59045, Lille Cedex, France. Centre Hospitalier de Valenciennes-Service de Néphrologie, Médecine Interne et Vasculaire, 59300, Valenciennes, France. Département de la Recherche en Santé, CHU Lille, 59000, Lille, France. UMR-S 1172-JPArc-Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer, Univ. Lille, 59000, Lille, France. UMR-S 1172, Inserm, 59000, Lille, France. Service d'Anatomopathologie, CHU Lille, 59000, Lille, France. CNRS, IPMC, FHU-OncoAge, Université Côte d'Azur, 06560, Valbonne, France. Service de Toxicologie et Génopathies, CHU Lille, 59000, Lille, France. Service de Néphrologie, CHU Lille, 59000, Lille, France. EA 4483-IMPECS-IMPact of Environmental ChemicalS on Human Health, Faculté de Médecine/Pôle Recherche, Univ. Lille, 1, place de Verdun, 59045, Lille Cedex, France. christelle.cauffiez@univ-lille2.fr.

Although Tacrolimus is an immunosuppressive drug widely used in renal transplantation, its chronic use paradoxically induces nephrotoxic effects, in particular renal fibrosis, which is responsible for chronic allograft dysfunction and represents a major prognostic factor of allograft survival. As molecular pathways and mechanisms involved in Tacrolimus-induced fibrogenic response are poorly elucidated, we assessed whether miRNAs are involved in the nephrotoxic effects mediated by Tacrolimus. Treatment of CD-1 mice with Tacrolimus (1 mg/kg/d for 28 days) resulted in kidney injury and was associated with alteration of a gene expression signature associated with cellular stress, fibrosis and inflammation. Tacrolimus also affected renal miRNA expression, including miRNAs previously involved in fibrotic and inflammatory processes as "fibromirs" such as miR-21-5p, miR-199a-5p and miR-214-3p. In agreement with in vivo data, Renal Proximal Tubular Epithelial cells exposed to Tacrolimus (25 and 50 µM) showed upregulation of miR-21-5p and the concomitant induction of epithelial phenotypic changes, inflammation and oxidative stress. In conclusion, this study suggests for the first time that miRNAs, especially fibromiRs, participate to Tacrolimus-induced nephrotoxic effects. Therefore, targeting miRNAs may be a new therapeutic option to counteract Tacrolimus deleterious effects on kidney.
Pubmed link : 29362864

9. CD8+ T cells are essential for the effects of enriched environment on hippocampus-dependent behavior, hippocampal neurogenesis and synaptic plasticity.
Brain Behav Immun. 2017 Nov 22. pii: S0889-1591(17)30517-2. doi: 10.1016/j.bbi.2017.11.016.
Zarif H, Nicolas S, Guyot M, Hosseiny S, Lazzari A, Canali MM, Cazareth J, Brau F, Golzne V, Dourneau E, Maillaut M, Luci C, Paquet A, Lebrigand K, Arguel MJ, Daoudlarian D, Heurteaux C, Glaichenhaus N, Chabry J, Guyon A, Petit-Paitel A
Université Côte d'Azur, CNRS, IPMC, France. Université Côte d'Azur, INSERM, CNRS, IPMC, France. Université Côte d'Azur, C3M, INSERM U 1065, France. Université Côte d'Azur, INSERM, CNRS, IPMC, France. Electronic address: joelle.chabry@ipmc.cnrs.fr. Université Côte d'Azur, CNRS, IPMC, France. Electronic address: alice.guyon@ipmc.cnrs.fr.

Enriched environment (EE) induces plasticity changes in the brain. Recently, CD4+ T cells have been shown to be involved in brain plasticity processes. Here, we show that CD8+ T cells are required for EE-induced brain plasticity in mice, as revealed by measurements of hippocampal volume, neurogenesis in the DG of the hippocampus, spinogenesis and glutamatergic synaptic function in the CA of the hippocampus. As a consequence, EE-induced behavioral benefits depend, at least in part, on CD8+ T cells. In addition, we show that spleen CD8+ T cells from mice housed in standard environment (SE) and EE have different properties in terms of 1) TNFα release after in vitro CD3/CD28 or PMA/Iono stimulation 2) in vitro proliferation properties 3) CD8+ CD44+ CD62Llow and CD62Lhi T cells repartition 4) transcriptomic signature as revealed by RNA sequencing. CD8+ T cells purified from the choroid plexus of SE and EE mice also exhibit different transcriptomic profiles as highlighted by single-cell mRNA sequencing. We show that CD8+ T cells are essential mediators of beneficial EE effects on brain plasticity and cognition. Additionally, we propose that EE differentially primes CD8+ T cells leading to behavioral improvement.
Pubmed link : 29175168

10. Optimizing drug development in oncology by clinical trial simulation: Why and how?
Brief Bioinform. 2017 May 29. doi: 10.1093/bib/bbx055
Gal J, Milano G, Ferrero JM, Saâda-Bouzid E, Viotti J, Chabaud S, Gougis P, Le Tourneau C, Schiappa R, Paquet A, Chamorey E
Epidemiology and Biostatistics Unit, Centre Antoine Lacassagne, 33 avenue de Valombrose, 06189 Nice, France IPMC

In therapeutic research, the safety and efficacy of pharmaceutical products are necessarily tested on humans via clinical trials after an extensive and expensive preclinical development period. Methodologies such as computer modeling and clinical trial simulation (CTS) might represent a valuable option to reduce animal and human assays. The relevance of these methods is well recognized in pharmacokinetics and pharmacodynamics from the preclinical phase to postmarketing. However, they are barely used and are poorly regarded for drug approval, despite Food and Drug Administration and European Medicines Agency recommendations. The generalization of CTS could be greatly facilitated by the availability of software for modeling biological systems, by clinical trial studies and hospital databases. Data sharing and data merging raise legal, policy and technical issues that will need to be addressed. Development of future molecules will have to use CTS for faster development and thus enable better patient management. Drug activity modeling coupled with disease modeling, optimal use of medical data and increased computing speed should allow this leap forward. The realization of CTS requires not only bioinformatics tools to allow interconnection and global integration of all clinical data but also a universal legal framework to protect the privacy of every patient. While recognizing that CTS can never replace 'real-life' trials, they should be implemented in future drug development schemes to provide quantitative support for decision-making. This in silico medicine opens the way to the P4 medicine: predictive, preventive, personalized and participatory.
Pubmed link : 28575140

11. Characterizing isomiR variants within the microRNA-34/449 family
FEBS Lett. 2017 Mar;591(5):693-705. doi: 10.1002/1873-3468.12595. Epub 2017 Feb 28
Mercey O, Popa A, Cavard A, Paquet A, Chevalier B, Pons N, Magnone V, Zangari J, Brest P, Zaragosi LE, Ponzio G, Lebrigand K, Barbry P, Marcet B
CNRS, IPMC, Université Côte d'Azur, Sophia-Antipolis, Valbonne, France. CNRS, INSERM, IRCAN, FHU-OncoAge, Université Côte d'Azur, Sophia-Antipolis, Valbonne, France.

miR-34/449 microRNAs are conserved regulators of multiciliated cell differentiation. Here, we evidence and characterize expression of two isomiR variant sequences from the miR-34/449 family in human airway epithelial cells. These isomiRs differ from their canonical counterparts miR-34b and miR-449c by one supplemental uridine at their 5'-end, leading to a one-base shift in their seed region. Overexpression of canonical miR-34/449 or 5'-isomiR-34/449 induces distinct gene expression profiles and biological effects. However, some target transcripts and functional activities are shared by both canonical microRNAs and isomiRs. Indeed, both repress important targets that result in cell cycle blockage and Notch pathway inhibition. Our findings suggest that 5'-isomiR-34/449 may represent additional mechanisms by which miR-34/449 family finely controls several pathways to drive multiciliogenesis.
Pubmed link : 28192603

12. A cost effective 5' selective single cell transcriptome profiling approach with improved UMI design
Nucleic Acids Res. 2016 Dec 9. pii: gkw1242.
Arguel MJ, Lebrigand K, Paquet A, Ruiz Garcia S, Zaragosi LE, Barbry P, Waldmann R
Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire, F06560 Sophia Antipolis, France. Université Côte d'Azur, CNRS, Institut de Pharmacologie Moléculaire et Cellulaire, F06560 Sophia Antipolis, France

Single cell RNA sequencing approaches are instrumental in studies of cell-to-cell variability. 5' selective transcriptome profiling approaches allow simultaneous definition of the transcription start size and have advantages over 3' selective approaches which just provide internal sequences close to the 3' end. The only currently existing 5' selective approach requires costly and labor intensive fragmentation and cell barcoding after cDNA amplification. We developed an optimized 5' selective workflow where all the cell indexing is done prior to fragmentation. With our protocol, cell indexing can be performed in the Fluidigm C1 microfluidic device, resulting in a significant reduction of cost and labor. We also designed optimized unique molecular identifiers that show less sequence bias and vulnerability towards sequencing errors resulting in an improved accuracy of molecule counting. We provide comprehensive experimental workflows for Illumina and Ion Proton sequencers that allow single cell sequencing in a cost range comparable to qPCR assays.
Pubmed link : 27940562

13. Copy-number analysis identified new prognostic marker in acute myeloid leukemia.
Leukemia. 2016 Nov 4. doi: 10.1038/leu.2016.265.
Nibourel O, Guihard S, Roumier C, Pottier N, Terre C, Paquet A, Peyrouze P, Geffroy S, Quentin S, Alberdi A, Abdelali RB, Renneville A, Demay C, Celli-Lebras K, Barbry P, Quesnel B, Castaigne S, Dombret H, Soulier J, Preudhomme C, Cheok MH
CHU Lille University Hospital, Department of Hematology, Lille, France. INSERM UMR-S1172, Institute for Cancer Research of Lille, Factors of Leukemia Cell Persistance, Lille Cedex, France. CHU Lille University Hospital, Department of Biochemistry and Molecular Biology, Lille, France. Hospital of Versailles, Department of Hematology, Chesnay, France. University Côte d'Azur, CNRS Institute of Molecular and Cellular Pharmacology, Sophia-Antipolis, Nice, France. University Paris Diderot, INSERM U944 Saint-Louis Hospital, Department of Hematology, Paris, France. 7University Paris 7, Department of Hematology, Paris, France.

Recent advances in genomic technologies have revolutionized acute myeloid leukemia (AML) understanding by identifying potential novel actionable genomic alterations. Consequently, current risk stratification at diagnosis not only relies on cytogenetics, but also on the inclusion of several of these abnormalities. Despite this progress, AML remains a heterogeneous and complex malignancy with variable response to current therapy. Although copy-number alterations (CNAs) are accepted prognostic markers in cancers, large-scale genomic studies aiming at identifying specific prognostic CNA-based markers in AML are still lacking. Using 367 AML, we identified four recurrent CNA on chromosomes 11 and 21 that predicted outcome even after adjusting for standard prognostic risk factors and potentially delineated two new subclasses of AML with poor prognosis. ERG amplification, the most frequent CNA, was related to cytarabine resistance, a cornerstone drug of AML therapy. These findings were further validated in The Cancer Genome Atlas data. Our results demonstrate that specific CNA are of independent prognostic relevance, and provide new molecular information into the genomic basis of AML and cytarabine response. Finally, these CNA identified two potential novel risk groups of AML, which when confirmed prospectively, may improve the clinical risk stratification and potentially the AML outcome.Leukemia advance online publication, 4 November 2016; doi:10.1038/leu.2016.265.
Pubmed link : 27686867

14. RiboProfiling: a Bioconductor package for standard Ribo-seq pipeline processing.
F1000Res. 2016 Jun 9;5:1309. doi: 10.12688/f1000research.8964.1. eCollection 2016.
Popa A, Lebrigand K, Paquet A, Nottet N, Robbe-Sermesant K, Waldmann R, Barbry P
Institut de Pharmacologie Moleculaire et Cellulaire, University Nice Sophia Antipolis and CNRS, Sophia- Antipolis, 06560, France.

The ribosome profiling technique (Ribo-seq) allows the selective sequencing of translated RNA regions. Recently, the analysis of genomic sequences associated to Ribo-seq reads has been widely employed to assess their coding potential. These analyses led to the identification of differentially translated transcripts under different experimental conditions, and/or ribosome pausing on codon motifs. In the context of the ever-growing need for tools analyzing Ribo-seq reads, we have developed 'RiboProfiling', a new Bioconductor open-source package. 'RiboProfiling' provides a full pipeline to cover all key steps for the analysis of ribosome footprints. This pipeline has been implemented in a single R workflow. The package takes an alignment (BAM) file as input and performs ribosome footprint quantification at a transcript level. It also identifies footprint accumulation on particular amino acids or multi amino-acids motifs. Report summary graphs and data quantification are generated automatically. The package facilitates quality assessment and quantification of Ribo-seq experiments. Its implementation in Bioconductor enables the modeling and statistical analysis of its output through the vast choice of packages available in R. This article illustrates how to identify codon-motifs accumulating ribosome footprints, based on data from Escherichia coli.
Pubmed link : 27347386

15. SENS-IS, a 3D reconstituted epidermis based model for quantifying chemical sensitization potency: Reproducibility and predictivity results from an inter-laboratory study.
Toxicol In Vitro. 2016 Jan 18;32:248-260. doi: 10.1016/j.tiv.2016.01.007.
Cottrez F, Boitel E, Ourlin JC, Peiffer JL, Fabre I, Henaoui IS, Mari B, Vallauri A, Paquet A, Barbry P, Auriault C, Aeby P, Groux H
1ImmunoSearch, Grasse, France. 2Agence nationale de sécurité du médicament, Vendargues, France. 3CNRS, Institute of Molecular and Cellular Pharmacology, Sophia Antipolis, France; University of Nice Sophia Antipolis, Nice, France. 4Independant Consultant, Marly, Switzerland. 5ImmunoSearch, Grasse, France. Electronic address: hgroux@immunosearch.fr.

The SENS-IS test protocol for the in vitro detection of sensitizers is based on a reconstructed human skin model (Episkin) as the test system and on the analysis of the expression of a large panel of genes. Its excellent performance was initially demonstrated with a limited set of test chemicals. Further studies (described here) were organized to confirm these preliminary results and to obtain a detailed statistical analysis of the predictive capacity of the assay. A ring-study was thus organized and performed within three laboratories, using a test set of 19 blind coded chemicals. Data analysis indicated that the assay is robust, easily transferable and offers high predictivity and excellent within- and between-laboratories reproducibility. To further evaluate the predictivity of the test protocol according to Cooper statistics a comprehensive test set of 150 chemicals was then analyzed. Again, data analysis confirmed the excellent capacity of the SENS-IS assay for predicting both hazard and potency characteristics, confirming that this assay should be considered as a serious alternative to the available in vivo sensitization tests.
Pubmed link : 26795242

16. Predicting HIV-1 broadly neutralizing antibody epitope networks using neutralization titers and a novel computational method.
BMC Bioinformatics. 2014 Mar 19;15:77. doi: 10.1186/1471-2105-15-77.
Evans MC, Phung P, Paquet AC, Parikh A, Petropoulos CJ, Wrin T, Haddad M
1Monogram Biosciences Inc,, 345 Oyster Point Blvd,, South San Francisco, CA 94080, USA. mojganhd@yahoo.com.

BACKGROUND: Recent efforts in HIV-1 vaccine design have focused on immunogens that evoke potent neutralizing antibody responses to a broad spectrum of viruses circulating worldwide. However, the development of effective vaccines will depend on the identification and characterization of the neutralizing antibodies and their epitopes. We developed bioinformatics methods to predict epitope networks and antigenic determinants using structural information, as well as corresponding genotypes and phenotypes generated by a highly sensitive and reproducible neutralization assay.282 clonal envelope sequences from a multiclade panel of HIV-1 viruses were tested in viral neutralization assays with an array of broadly neutralizing monoclonal antibodies (mAbs: b12, PG9,16, PGT121 - 128, PGT130 - 131, PGT135 - 137, PGT141 - 145, and PGV04). We correlated IC50 titers with the envelope sequences, and used this information to predict antibody epitope networks. Structural patches were defined as amino acid groups based on solvent-accessibility, radius, atomic depth, and interaction networks within 3D envelope models. We applied a boosted algorithm consisting of multiple machine-learning and statistical models to evaluate these patches as possible antibody epitope regions, evidenced by strong correlations with the neutralization response for each antibody. RESULTS: We identified patch clusters with significant correlation to IC50 titers as sites that impact neutralization sensitivity and therefore are potentially part of the antibody binding sites. Predicted epitope networks were mostly located within the variable loops of the envelope glycoprotein (gp120), particularly in V1/V2. Site-directed mutagenesis experiments involving residues identified as epitope networks across multiple mAbs confirmed association of these residues with loss or gain of neutralization sensitivity. CONCLUSIONS: Computational methods were implemented to rapidly survey protein structures and predict epitope networks associated with response to individual monoclonal antibodies, which resulted in the identification and deeper understanding of immunological hotspots targeted by broadly neutralizing HIV-1 antibodies.
Pubmed link : 24646213

17. A decade of HIV-1 drug resistance in the United States: trends and characteristics in a large protease/reverse transcriptase and co-receptor tropism database from 2003 to 2012.
Antivir Ther. 2014;19(4):435-41. doi: 10.3851/IMP2748. Epub 2014 Feb 12.
Paquet AC, Solberg OD, Napolitano LA, Volpe JM, Walworth C, Whitcomb JM, Petropoulos CJ, Haddad M
Monogram Biosciences, South San Francisco, CA, USA.

BACKGROUND: Drug resistance testing and co-receptor tropism determination are key components of the management of antiretroviral therapy for HIV-1-infected individuals. The purpose of this study was to examine trends of HIV-1 resistance and viral evolution in the past decade by surveying a large commercial patient testing database. METHODS: Temporal trends of drug resistance, viral fitness and co-receptor usage among samples submitted for routine phenotypic and genotypic resistance testing to protease inhibitors (PIs), nucleoside reverse transcriptase inhibitors (NRTIs) and non-nucleoside reverse transcriptase inhibitors (NNRTIs), as well as for tropism determination were investigated. RESULTS: Within 62,397 resistant viruses reported from 2003 to 2012, we observed a decreasing trend in the prevalence of three-class resistance (from 25% to 9%) driven by decreased resistance to PIs (43% to 21%) and NRTIs (79% to 57%), while observing a slight increase in NNRTI resistance (68% to 75%). The prevalence of CXCR4-mediated entry among tropism testing samples (n=52,945) declined over time from 47% in 2007 to 40% in 2012. A higher proportion of CXCR4-tropic viruses was observed within samples with three-class resistance (50%) compared with the group with no resistance (36%). CONCLUSIONS: Decreased prevalence of three-class resistance and increased prevalence of one-class resistance was observed within samples reported between 2003 and 2012. The fraction of CXCR4-tropic viruses has decreased over time; however, CXCR4 usage was more prevalent among multi-class-resistant samples, which may be due to the more advanced disease stage of treatment-experienced patients. These trends have important implications for clinical practice and future drug discovery and development.
Pubmed link : 24518099