Benign & Pathological Chromosomal Imbalances

Microscopic and Submicroscopic Copy Number Variations (CNVs) in Genetics and Counseling


  • Thomas Liehr, Jena University Hospital, Institute of Human Genetics and Anthropology, Jena, Germany

Benign & Pathological Chromosomal Imbalances systematically clarifies the disease implications of cytogenetically visible copy number variants (CG-CNV) using cytogenetic assessment of heterochromatic or euchromatic DNA variants. While variants of several megabasepair can be present in the human genome without clinical consequence, visually distinguishing these benign areas from disease implications does not always occur to practitioners accustomed to costly molecular profiling methods such as FISH, aCGH, and NGS.

As technology-driven approaches like FISH and aCGH have yet to achieve the promise of universal coverage or cost efficacy to sample investigated, deep chromosome analysis and molecular cytogenetics remains relevant for technology translation, study design, and therapeutic assessment.

Knowledge of the rare but recurrent rearrangements unfamiliar to practitioners saves time and money for molecular cytogeneticists and genetics counselors, helping to distinguish benign from harmful CG-CNV. It also supports them in deciding which molecular cytogenetics tools to deploy.

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Clinical Cytogeneticists, genetic technologists, supervisors and lab directors, as well as related health professionals seeking to review or contribute to chromosomal analysis and reporting


Book information

  • Published: September 2013
  • ISBN: 978-0-12-404631-3


"Liehr…surveys the current knowledge of variation in the human genome, including the increasing number of alterations that seem to have no phenotypic consequences - a phenomenon once thought rare if not impossible. Focusing on cytogenetically visible copy number variants (CG-CNVs), he considers what the norm is, inheritance, formation, types, and their role on genetic diagnostics and counseling."--Reference & Research Book News, December 2013

Table of Contents

1. Introduction
2. Inheritance of CG-CNV
3. CG-CNV and Tumor
4. Formation of CG-CNV
5. Types of CG-CNV
6. CG-CNV in Genetic Diagnostics and Counseling
7. Online Resources