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    Variant Analysis Service

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    • Next Generation Sequencing >
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    • Variant Analysis Service
     

     

    Variant Analysis Service 


    Our Variant Analysis Service isn’t just a single solution – it offers a wide range of customizable options.
    Take a closer look at the available analyses using the diagram on this page and choose the one that fits your project best.

     

     
     

    Highlights

     

    • High-Precision Variant Detection: Joint cohort calling minimizes false positives, enhances rare variant identification, and ensures consistent genotyping across samples.
    • Robust Data Handling: Efficiently processes low-quality and low-depth data while reducing batch effects and inconsistencies.
    • Comprehensive Analysis Workflow: Covers quality assessment, genome mapping, variant calling, annotation, and detailed reporting for reliable genomic insights.
    • Advanced Biomarker Insights: Detects MSI status, TMB, CNV, and structural variations to support in-depth genomic research and clinical applications.
    • Advanced algorithm: We use the advanced algorithm (Sentieon) to achieve highest accuracy and efficiency in variant detection. It enables precise germline variant calling, identifying SNPs and indels with reliability. The software ensures rapid processing of large-scale sequencing data, offering high throughput and scalability. Advanced quality control features, such as base quality score recalibration (BQSR) and duplicate marking, enhance data integrity. Additionally, it supports complex analyses like joint calling in cohort studies, improving rare and de novo variant detection. Optimized for speed and resource efficiency, Sentieon is ideal for large-scale genomic projects.
     

     

    The diagram offers a structured approach to selecting the appropriate variant calling methodology based on organism type and analysis requirements.

    For human samples, either Germline Variant Calling (for inherited mutations) or Somatic Variant Calling (for acquired mutations, such as those found in cancer) may be relevant. Germline analysis can be performed on a single sample or as part of a cohort study, while somatic analysis can be conducted independently or with a matched control to improve accuracy.

    For other eukaryotic and prokaryotic organisms, a standard variant calling approach is applied.

    This decision tree enables you to quickly identify the most suitable service based on your research focus and sample type, ensuring a highly relevant and efficient analysis.

     

    Advantages of Joint Calling in a Cohort Study

     

    1. Improved Variant Detection Accuracy

    Joint calling considers all samples together, reducing false positives and improving sensitivity to rare variants.

    2. Consistent Genotype Calling

    Ensures uniform variant calling across all samples, minimizing batch effects and inconsistencies.

    3. Better Handling of Low-Quality Data

    Allows recovery of variants in low-depth regions by leveraging data from multiple samples.

    4. Identification of Rare and De Novo Variants

    Enhances the detection of rare mutations by comparing multiple individuals within the cohort.

    5. More Robust Population-Level Analysis

    Supports downstream analyses like allele frequency estimation and association studies.

     

     

    Example: Joint Calling in Cancer Research

    In a cancer genomics study, researchers analyze 100 patients with lung cancer to identify common and rare mutations. By performing joint variant calling, they detect shared mutations across multiple patients, improving confidence in variant calls. This helps in discovering novel cancer driver mutations, guiding targeted therapies and drug development.

     

    Example: Joint Calling in Rare Genetic Disease Research

    In a study on rare neurological disorders, researchers analyze whole exome sequencing data from 500 patients with an unknown inherited condition. By using joint variant calling, they can compare genetic variants across all patients and unaffected family members. This approach helps identify rare recessive mutations or de novo variants that might be responsible for the disease. For instance, in a study of autism spectrum disorder (ASD), joint calling across a cohort of affected and unaffected siblings can reveal rare genetic variants associated with the condition, improving diagnostic accuracy and guiding further genetic research.

     

     

     

     

    Genomic Variant Analysis Process

     

     
    • Sequence Read Quality Assessment and Cleaning: Raw sequencing data is evaluated for quality using metrics like base quality scores, GC content, and adapter contamination. Low-quality reads and sequencing artifacts are filtered out to improve the accuracy of downstream analyses, ensuring reliable variant detection.
    • Mapping to Reference Genome: High-quality sequencing reads are aligned to a standardized reference genome to determine their genomic origin. This step is essential for identifying genetic variations by comparing sample sequences to a known reference, enabling precise variant detection and interpretation.
    • Removal of PCR Duplicated Reads: PCR amplification can introduce duplicate reads that artificially inflate variant frequencies. Removing these duplicates eliminates technical biases, ensuring that each variant call accurately represents true biological variation rather than sequencing artifacts.
    • Variant Calling Options:
      • Germline Variant Calling – Identifies inherited genetic variations, including single nucleotide variants (SNVs) and small insertions or deletions (InDels). Essential for studying hereditary diseases, population genetics, and familial risk factors.
      • Germline Joint Variant Calling – Conducted in a cohort setup to improve variant detection accuracy by leveraging shared genetic backgrounds. Ideal for population-based studies and large-scale genomic research.
      • Somatic Variant Calling – Detects SNVs and InDels in tumor samples, identifying mutations acquired during tumor development. Crucial for cancer research and precision oncology.
      • Somatic Variant Calling with Germline Filtration – Identifies somatic mutations while filtering out inherited (germline) variants. This approach improves specificity in detecting true tumor-specific mutations.
    • Variant Annotation: Identified variants are annotated using gene models and public databases to assess their functional significance. Annotation provides insights into potential pathogenicity, clinical relevance, and associations with known genetic disorders.
    • Quality Control (QC) Analysis: Comprehensive QC analysis evaluates key sequencing metrics, such as mapping accuracy, on-target read percentage, duplicate rates, coverage depth, and uniformity. This step ensures data reliability and identifies potential biases that may affect variant interpretation.
    • Microsatellite Instability (MSI) Status: MSI analysis detects variations in short repetitive DNA sequences, which can indicate defects in the DNA mismatch repair system. MSI is an important biomarker for various conditions, including Lynch syndrome and certain colorectal and endometrial diseases.
    • Tumor Mutational Burden (TMB): TMB measures the total number of somatic mutations in a tumor genome, offering insights into tumor aggressiveness and potential response to immunotherapy. It serves as a biomarker for identifying patients who may benefit from immune checkpoint inhibitors.
    • Copy Number Variations (CNVs) Analysis: CNV analysis detects large genomic alterations, such as duplications or deletions of DNA segments. These variations have significant implications in genetic disorders, developmental conditions, and diseases like neurodegenerative disorders.
    • Structural Variations (SV) Detection: This step identifies large-scale genomic changes, including inversions, translocations, and large insertions or deletions. Structural variation analysis is crucial for understanding complex genetic disorders and genomic changes linked to various diseases.
    • Analysis Reporting: All findings are compiled into a comprehensive report that summarizes the results of the analysis in an accessible format.
    • Post-analysis Consulting: After receiving results, consultation services via TEAMS CALL are available to discuss results and answer questions.
     
     

    Products where we offer Variant Analysis

     

     

     

    INVIEW Resequencing


    For all genomes up to 180 Mb


    >> READ MORE

     

     

     

    Amplicon
    Sequencing


    Short read and long read amplicons


    >> READ MORE

     

     

     

    Genome
    Sequencing


    Long read genome sequencing (ONT)


    >> READ MORE

     

     

     

    NGSelect DNA


    Full flexibility in data output


    >> READ MORE

     

     

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