Clinical Genetics Overview

Principles

Definition

Clinical genetics is an academic and medical discipline focused on understanding the role of genetic variation in human health and disease. It encompasses the investigation, diagnosis, management, and counseling of individuals and families affected by or at risk of genetic conditions, applying principles of human genetics to improve clinical care and advance understanding of heritable disorders.

Ontological type

Diagnostic Methods

Scope and Subfields

Genetic Counseling Practice

Key developments

Key Figures

Mendelian Cytogenetic Era era

Nancy C. Andreasen [1] worked with Washington University in St. Louis [2] and Cornell University [3] during the Mendelian Cytogenetic Era. Her key contribution, The Family History Method Using Diagnostic Criteria [4], advanced standardized pedigree-based inference and provided a framework for diagnosis, counseling, and risk assessment in clinical genetics. Andreasen's work [1] helped connect cytogenetic findings to familial patterns, reinforcing the era's emphasis on linking karyotypic imbalance to syndromic risk. Thus, Andreasen's approach [1] structured clinical genetics practice by integrating family history with cytogenetic insight, guiding diagnostic workflows and nosology.

Positional Cloning Era era

Francis S. Collins [1] was a central figure in the Positional Cloning Era, with affiliations at the American College of Medical Genetics [3] and The University of Texas Southwestern Medical Center [4] during this period. His landmark contribution, Identification of the Cystic Fibrosis Gene: Chromosome Walking and Jumping [7], demonstrated that disease genes could be localized and cloned by chromosome walking and jumping, enabling genotype-based diagnostics. Hans F. A. Vasen [2] was a leading figure associated with the Institute of Cancer Research [5] and Radboud University Nijmegen [6] in this era. He contributed to clinical genetics through establishing criteria for hereditary nonpolyposis colorectal cancer, as in New clinical criteria for hereditary nonpolyposis colorectal cancer (HNPCC, Lynch syndrome) proposed by the International Collaborative Group on HNPCC [8], a milestone in harmonizing diagnostic criteria and guiding genetic testing.

Genomic Standardization Era era

Heidi L. Rehm [1] is a leading figure in genomic medicine whose work in this era spans Harvard University [3] and the Massachusetts Institute of Technology [4]. Her contributions in the Genomic Standardization Era include the 2015 Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the ACMG and AMP [7], which established standardized criteria for pathogenicity and clinical actionability, and the 2003 Human Gene Mutation Database update [8] that underpinned curated mutation data. D.N. Cooper [2] is associated with Johns Hopkins University [5] and Baylor College of Medicine [6] in this era. His work includes the Human Gene Mutation Database (HGMD®): 2003 update [8], a foundational resource for curated mutation data that enabled standardized interpretation and cross-laboratory comparability in genomic medicine.