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Principles of Pharmacogenetics: Types of Genetic Variants

Principles of Pharmacogenetics: Types of Genetic Variants

The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...

Cancer-Critical Genes II: Tumor Suppressor Genes

Cancer-Critical Genes II: Tumor Suppressor Genes

Cancer-Critical Genes II: Tumor Suppressor Genes

Cancer-Critical Genes II: Tumor Suppressor Genes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...

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Updated: Mar 12, 2026

Functional Assessment of BRCA1 variants using CRISPR-Mediated Base Editors

Functional Assessment of BRCA1 variants using CRISPR-Mediated Base Editors

Published on: February 28, 2021

Beyond DNA: An Integrated and Functional Approach for Classifying Germline Variants in Breast Cancer Genes.

T Pesaran¹, R Karam¹, R Huether¹

¹Ambry Genetics Corp., 15 Argonaut, Aliso Viejo, CA 92656, USA.

International Journal of Breast Cancer

|November 9, 2016

Summary

This summary is machine-generated.

Genetic testing for hereditary breast cancer requires expert variant classification for accurate patient care. This review details a clinical laboratory

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gDNA Enrichment by a Transposase-based Technology for NGS Analysis of the Whole Sequence of BRCA1, BRCA2, and 9 Genes Involved in DNA Damage Repair

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Integration of Wet and Dry Bench Processes Optimizes Targeted Next-generation Sequencing of Low-quality and Low-quantity Tumor Biopsies

Integration of Wet and Dry Bench Processes Optimizes Targeted Next-generation Sequencing of Low-quality and Low-quantity Tumor Biopsies

Published on: April 11, 2016

Area of Science:

Genomic Medicine
Clinical Genetics
Cancer Genomics

Background:

Hereditary breast cancer genetic testing is crucial for precision medicine and patient risk stratification.
Accurate classification of germline genetic variants is essential for effective cancer risk management.
Interpreting the clinical significance of identified variants presents complex challenges in genetic diagnostics.

Approach:

Overview of an integrated clinical laboratory approach for comprehensive variant assessment.
Discussion of critical factors and nuances in evaluating genomic variants.
Highlighting diverse lines of evidence, including functional assays and structural analysis, for variant interpretation.

Key Points:

The accuracy of genetic testing depends on technology, bioinformatics, and expert interpretation.
Variant classification directly impacts patient management and cancer risk assessment.
Functional and structural analyses aid in assessing rare and complex genetic variants.

Conclusions:

An integrated approach enhances the reliability of hereditary cancer genetic testing.
Expertise in variant assessment is vital for personalized cancer care.
Utilizing multiple lines of evidence improves the classification of challenging genetic variants.