Mark R. Hughes

Mark R. Hughes is an American physician and medical geneticist whose research on inherited disorders helped advance clinical genetic diagnosis and testing.

Connect

Duchenne muscular dystrophy: A genetic disorder characterized by progressive muscle degeneration, caused by pathogenic variants in the DMD gene. Hughes helped identify the gene responsible, enabling direct genetic diagnosis.
Louis M. Kunkel: An American geneticist whose research helped identify the gene responsible for Duchenne muscular dystrophy. Kunkel was Hughes’s close collaborator in isolating the Duchenne muscular dystrophy gene.
Positional cloning: A strategy for identifying a gene by locating it on a chromosome before knowing its protein or function. This strategy was central to finding disease genes such as the Duchenne gene.
Molecular diagnosis: Diagnosis based on detecting disease-associated changes in DNA, RNA, or proteins. Hughes’s gene-discovery work helped shift inherited-disease diagnosis toward direct molecular evidence.
Dystrophin: A protein that stabilizes muscle-cell membranes and is absent or deficient in Duchenne muscular dystrophy. The gene Hughes helped isolate encodes this protein.
Francis S. Collins: An American physician-geneticist who led the Human Genome Project and directed the National Institutes of Health. Collins and Hughes shared the development of positional cloning methods for disease genes.
Chromosome walking: A DNA-mapping technique that uses overlapping clones to move stepwise along a chromosome. Researchers used sequential genomic markers and clones to close in on the Duchenne locus.
Prenatal diagnosis: Testing during pregnancy to identify fetal genetic, chromosomal, or developmental conditions. Identifying disease mutations made prenatal testing possible for some at-risk families.
Genetic testing: The analysis of DNA, chromosomes, or gene products to identify inherited variants or assess genetic risk. Hughes’s research helped make molecular diagnosis practical for inherited disorders.
National Institutes of Health: The United States’ principal federal agency for biomedical and public-health research. Hughes conducted influential genetics research within the NIH research community.