Publications by authors named "Yec Han Laizet"

Article Synopsis
  • A study was conducted on the genomic profiles of uterine smooth muscle tumors, focusing on two types: fumarate hydratase deficient leiomyomas and leiomyomas with bizarre nuclei, to understand their relationship with clinical outcomes.
  • All patients in the study were alive without disease after an average follow-up of 87.3 months, leading to the conclusion that certain genomic indices (GI) were not reliable indicators of malignancy in these tumor types.
  • The research identified three groups of tumors based on genomic alterations and their associated GIs, suggesting that a GI less than 10 indicates benignity, while a GI greater than 10 does not necessarily indicate malignancy, offering a new diagnostic approach for these tumors
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Background: Real-world data (RWD) related to the health status and care of cancer patients reflect the ongoing medical practice, and their analysis yields essential real-world evidence. Advanced information technologies are vital for their collection, qualification, and reuse in research projects.

Methods: UNICANCER, the French federation of comprehensive cancer centres, has innovated a unique research network: Consore.

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Background: Soft-tissue sarcomas (STS) represent a heterogeneous group of rare tumors including more than 70 different histological subtypes. High throughput molecular analysis (next generation sequencing exome [NGS]) is a unique opportunity to identify driver mutations that can change the usual one-size-fits-all treatment paradigm to a patient-driven therapeutic strategy. The primary objective of the MULTISARC trial is to assess whether NGS can be conducted for a large proportion of metastatic STS participants within a reasonable time, and, secondarily to determine whether a NGS-guided therapeutic strategy improves participant's outcome.

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Purpose: Many institutions throughout the world have launched precision medicine initiatives in oncology, and a large amount of clinical and genomic data is being produced. Although there have been attempts at data sharing with the community, initiatives are still limited. In this context, a French task force composed of Integrated Cancer Research Sites (SIRICs), comprehensive cancer centers from the Unicancer network (one of Europe's largest cancer research organization), and university hospitals launched an initiative to improve and accelerate retrospective and prospective clinical and genomic data sharing in oncology.

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Background: Whole exome sequencing and RNA sequencing (WES/RNASeq) should now be implemented in the clinical practice in order to increase access to optimal care for cancer patients. Providing results to Tumour Boards in a relevant time frame-that is, compatible with the clinical pathway-is crucial. Assessing the feasibility of this implementation in the French care system is the primary objective of the Multipli study, as one of the four pilot projects of the national France Genomic Medicine 2025 (FGM 2025) plan.

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Alterations of genes encoding subunits of the BAF/PBAF complexes are among the most frequent gene aberrations in human cancer. Such alterations have been shown to have an impact on tumor microenvironnement and on the capacity of tumors to respond to immune-checkpoint inhibitors (ICI). We analysed the clinical and genetic data from 43,728 patients accessed through cBioportal.

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Soft-tissue sarcomas represent a heterogeneous group of cancer, with more than 50 histological subtypes. The clinical presentation of patients with different subtypes is often atypical, and responses to therapies such as immune checkpoint blockade vary widely. To explain this clinical variability, here we study gene expression profiles in 608 tumours across subtypes of soft-tissue sarcoma.

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Starmerella bacillaris is an ascomycetous yeast ubiquitously present in grapes and fermenting grape musts. In this report, we present the draft genome sequence of the S. bacillaris type strain CBS 9494, isolated from sweet botrytized wines, which will contribute to the study of this genetically heterogeneous wine yeast species.

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Importance: Patients with advanced soft-tissue sarcomas (STS) have a median overall survival of less than 18 months. Identification of molecular abnormalities for which targeted therapies are available or can be developed is critical for improving patient outcomes.

Objective: To characterize targetable genomic alterations (GAs) in patients with STS.

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The RADseq technology allows researchers to efficiently develop thousands of polymorphic loci across multiple individuals with little or no prior information on the genome. However, many questions remain about the biases inherent to this technology. Notably, sequence misalignments arising from paralogy may affect the development of single nucleotide polymorphism (SNP) markers and the estimation of genetic diversity.

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Previous precision medicine studies have investigated conventional molecular techniques and/or limited sets of gene alterations. The aim of this study was to describe the impact of the next-generation sequencing of the largest panel of genes used to date in tumour tissue and blood in the context of institutional molecular screening programmes. DNA analysis was performed by next-generation sequencing using a panel of 426 cancer-related genes and by comparative genomic hybridization from formalin-fixed and paraffin-embedded archived tumour samples when available or from fresh tumour samples.

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EXAMPLE OF SARCOMAS IN FRANCE: Sarcomas are rare and heterogeneous tumours, and improvement of knowledge and of patient management need to gather and share data and biological material. The French sarcoma database stores in a warehouse clinical, pathological, molecular, therapeutic and follow-up data as well as data on samples and medical practices. This database and the national structured networks constitute major tools for the French Sarcoma Group.

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Article Synopsis
  • - The study addresses limitations in identifying individual genes associated with traits in fruit trees by using genome-wide association (GWA) mapping in apricot for Plum Pox Virus (PPV) resistance.
  • - It leverages the genetic diversity of apricot germplasm and utilizes next-generation sequencing alongside the peach genome reference for identifying single nucleotide polymorphisms (SNPs).
  • - The findings validate existing resistance QTL intervals and identify new potential resistance loci, demonstrating the effectiveness of GWA in pinpointing candidate genes for further research.
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The yeast Candida zemplinina (Starmerella bacillaris) is frequently isolated from grape and wine environments. Its enological use in mixed fermentation with Saccharomyces cerevisiae has been extensively investigated these last few years, and several interesting features including low ethanol production, fructophily, glycerol and other metabolites production, have been described. In addition, molecular tools allowing the characterization of yeast populations have been developed, both at the inter- and intraspecific levels.

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Seedling establishment is a crucial phase during plant development when the germinating heterotrophic embryo switches to autotrophic growth and development. Positive regulators of embryonic development need to be turned off, while the cell cycle machinery is activated to allow cell cycle entry and organ primordia initiation. However, it is not yet understood how the molecular mechanisms responsible for the onset of cell division, metabolism changes and cell differentiation are coordinated during this transition.

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Several genes involved in the regulation of postembryonic organ initiation and growth have been identified. However, it remains largely unclear how developmental cues connect to the cell cycle. RETINOBLASTOMA RELATED (RBR) is a plant homolog of the tumor suppressor Retinoblastoma (pRb), which is a key regulator of the cell cycle.

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Article Synopsis
  • The study investigates the role of plant fibrillins (FIB1a, -1b, -2) in Arabidopsis using RNA interference, revealing that reduced levels of these proteins hinder long-term acclimation to combined light and cold stress.
  • Affected plants exhibit poor photosynthesis protection, abnormal membrane arrangements, slower growth, and reduced anthocyanin accumulation, all of which are reversed by jasmonate (JA) treatments.
  • The findings suggest that JA plays a crucial role in chloroplast acclimation to stress, with FIB proteins facilitating the process through their impact on plastoglobule-associated JA biosynthesis.
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