Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

CarcSeq Measurement of Rat Mammary Cancer Driver Mutations and Relation to Spontaneous Mammary Neoplasia

Journal Article · · Toxicological Sciences
 [1];  [1];  [1];  [2];  [2];  [1]
  1. Division of Genetic and Molecular Toxicology
  2. Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, Arkansas 72079, USA
Abstract

The ability to deduce carcinogenic potential from subchronic, repeat dose rodent studies would constitute a major advance in chemical safety assessment and drug development. This study investigated an error-corrected NGS method (CarcSeq) for quantifying cancer driver mutations (CDMs) and deriving a metric of clonal expansion predictive of future neoplastic potential. CarcSeq was designed to interrogate subsets of amplicons encompassing hotspot CDMs applicable to a variety of cancers. Previously, normal human breast DNA was analyzed by CarcSeq and metrics based on mammary-specific CDMs were correlated with tissue donor age, a surrogate of breast cancer risk. Here we report development of parallel methodologies for rat. The utility of the rat CarcSeq method for predicting neoplastic potential was investigated by analyzing mammary tissue of 16-week-old untreated rats with known differences in spontaneous mammary neoplasia (Fischer 344, Wistar Han, and Sprague Dawley). Hundreds of mutants with mutant fractions ≥ 10−4 were quantified in each strain, most were recurrent mutations, and 42.5% of the nonsynonymous mutations have human homologs. Mutants in the mammary-specific target of the most tumor-sensitive strain (Sprague Dawley) showed the greatest nonsynonymous/synonymous mutation ratio, indicative of positive selection consistent with clonal expansion. For the mammary-specific target (Hras, Pik3ca, and Tp53 amplicons), median absolute deviation correlated with percentages of rats that develop spontaneous mammary neoplasia at 104 weeks (Pearson r = 1.0000, 1-tailed p = .0010). Therefore, this study produced evidence CarcSeq analysis of spontaneously occurring CDMs can be used to derive an early metric of clonal expansion relatable to long-term neoplastic outcome.

Sponsoring Organization:
USDOE
OSTI ID:
1808361
Journal Information:
Toxicological Sciences, Journal Name: Toxicological Sciences Journal Issue: 1 Vol. 182; ISSN 1096-6080
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

References (36)

Oncomutations as biomarkers of cancer risk journal August 2010
Mechanisms of DNA damage, repair, and mutagenesis: DNA Damage and Repair journal May 2017
Variation in organ-specific PIK3CA and KRAS mutant levels in normal human tissues correlates with mutation prevalence in corresponding carcinomas: Tissue-Specific Properties of Hotspot Cancer-Driver Mutations journal July 2017
Rationale and Roadmap for Developing Panels of Hotspot Cancer Driver Gene Mutations as Biomarkers of Cancer Risk journal October 2019
Next‐Generation Genotoxicology: Using Modern Sequencing Technologies to Assess Somatic Mutagenesis and Cancer Risk journal November 2019
Quantification of cancer driver mutations in human breast and lung DNA using targeted, error‐corrected CarcSeq journal September 2020
A subset of papillary thyroid carcinomas contain KRAS mutant subpopulations at levels above normal thyroid: KRAS MUTANT FRACTION IN PAPILLARY THYROID TUMORS journal August 2012
Prospects for applying genotypic selection of somatic oncomutation to chemical risk assessment journal October 2001
Universal Patterns of Selection in Cancer and Somatic Tissues journal November 2017
Clonal Expansion and Diversification of Cancer-Associated Mutations in Endometriosis and Normal Endometrium journal August 2018
Ultra-Sensitive TP53 Sequencing for Cancer Detection Reveals Progressive Clonal Selection in Normal Tissue over a Century of Human Lifespan journal July 2019
Changing the field of carcinogenicity testing of human pharmaceuticals by emphasizing mode of action journal April 2017
Breast Cancer Heterogeneity Examined by High-Sensitivity Quantification of PIK3CA, KRAS, HRAS, and BRAF Mutations in Normal Breast and Ductal Carcinomas journal April 2016
MATH, a novel measure of intratumor genetic heterogeneity, is high in poor-outcome classes of head and neck squamous cell carcinoma journal March 2013
The stability of historical control data for common neoplasms in laboratory rats: adrenal gland (medulla), mammary gland, liver, endocrine pancreas, and pituitary gland journal August 2004
Evaluation of carcinogenicity studies of medicinal products for human use authorised via the European centralised procedure (1995–2009) journal July 2011
A cross-sector call to improve carcinogenicity risk assessment through use of genomic methodologies journal February 2020
Clonal haematopoiesis harbouring AML-associated mutations is ubiquitous in healthy adults journal August 2016
Detecting ultralow-frequency mutations by Duplex Sequencing journal October 2014
Enhancing the accuracy of next-generation sequencing for detecting rare and subclonal mutations journal March 2018
The COSMIC Cancer Gene Census: describing genetic dysfunction across all human cancers journal October 2018
Age-related remodelling of oesophageal epithelia by mutated cancer drivers journal January 2019
The mutational landscape of normal human endometrial epithelium journal April 2020
The mutational signature profile of known and suspected human carcinogens in mice journal September 2020
Only three driver gene mutations are required for the development of lung and colorectal cancers journal December 2014
N-nitroso-N-methylurea-induced rat mammary tumors arise from cells with preexisting oncogenic Hras1 gene mutations. journal April 1994
ACB-PCR Quantification of K- RAS Codon 12 GAT and GTT Mutant Fraction in Colon Tumor and Non-Tumor Tissue journal April 2010
Temporal Changes in K-ras Mutant Fraction in Lung Tissue of Big Blue B6C3F1 Mice Exposed to Ethylene Oxide journal September 2013
High burden and pervasive positive selection of somatic mutations in normal human skin journal May 2015
Somatic mutation in cancer and normal cells journal September 2015
Somatic mutant clones colonize the human esophagus with age journal October 2018
Comparison of NTP Historical Control Tumor Incidence Rates in Female Harlan Sprague Dawley and Fischer 344/N Rats journal July 2010
A Critical Review of the Effectiveness of Rodent Pharmaceutical Carcinogenesis Testing in Predicting for Human Risk journal March 2011
Low-frequency KRAS mutations are prevalent in lung adenocarcinomas journal March 2015
Selective Pressures on Human Cancer Genes along the Evolution of Mammals journal November 2018
Low-Frequency Mutational Heterogeneity of Invasive Ductal Carcinoma Subtypes: Information to Direct Precision Oncology journal February 2019

Similar Records

Assessment of Clonal Expansion Using CarcSeq Measurement of Lung Cancer Driver Mutations and Correlation With Mouse Strain- and Sex-Related Incidence of Spontaneous Lung Neoplasia
Journal Article · Mon Aug 09 00:00:00 EDT 2021 · Toxicological Sciences · OSTI ID:1982722

Assessment of Clonal Expansion Using CarcSeq Measurement of Lung Cancer Driver Mutations and Correlation With Mouse Strain- and Sex-Related Incidence of Spontaneous Lung Neoplasia
Journal Article · Sun Aug 08 20:00:00 EDT 2021 · Toxicological Sciences · OSTI ID:1814548

High Relative Biologic Effectiveness of Carbon Ion Radiation on Induction of Rat Mammary Carcinoma and its Lack of H-ras and Tp53 Mutations
Journal Article · Sat Sep 01 00:00:00 EDT 2007 · International Journal of Radiation Oncology, Biology and Physics · OSTI ID:21036216

Related Subjects