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Disease Profile

Chromosome 3q duplication

Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.


US Estimated

Europe Estimated

Age of onset





Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease.


Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype.


dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.


recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder.


Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.


Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.


Not applicable


Other names (AKA)

Trisomy 3q; Duplication 3q; Chromosome 3, trisomy 3q


Chromosome Disorders


Chromosome 3q duplication is a chromosome abnormality that occurs when there is an extra copy of genetic material on the long arm (q) of chromosome 3. The severity of the condition and the signs and symptoms depend on the size and location of the duplication and which genes are involved. Features that may be present in a person with a chromosome 3q duplication include distinctive facial features, hirsutism (excessive hair growth in women), small head size (microcephaly), intellectual disability, slowed growth, and abnormalities of the hands, feet, genitourinary system, kidneys, and/or heart. Various other neurologic abnormalities or birth defects affecting other parts of the body may also occur. About one third of babies with chromosome 3q duplication do not survive past the first year of life, often due to heart defects or infections.[1]

Chromosome 3q duplication can be de novo (not inherited and occurring for the first time), or inherited from a parent with a chromosomal rearrangement such as a balanced translocation.[2] In most cases, it occurs as part of an unbalanced translocation, which means that abnormalities of other chromosomes are also present.[1] Treatment is based on the signs and symptoms present in each person.


Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

Organizations Supporting this Disease

    Learn more

    These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

    Where to Start

    • Genetics Home Reference (GHR) contains information on Chromosome 3q duplication. This website is maintained by the National Library of Medicine.
    • Unique is a source of information and support to families and individuals affected by rare chromosome disorders. Click on the link to view information about duplications of 3q.

      In-Depth Information

      • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
      • PubMed is a searchable database of medical literature and lists journal articles that discuss Chromosome 3q duplication. Click on the link to view a sample search on this topic.


        1. Dworschak GC, Crétolle C, Hilger A, Engels H, Korsch E, Reutter H, Ludwig M. Comprehensive review of the duplication 3q syndrome and report of a patient with Currarino syndrome and de novo duplication 3q26.32-q27.2. Clin Genet. May, 2017; 91(5):661-671. https://www.ncbi.nlm.nih.gov/pubmed/27549440.
        2. Duplications of 3q. Unique. 2008; https://www.rarechromo.org/information/Chromosome%20%203/3q%20duplications%20FTNW.pdf.