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Disease Profile

Chromosome 8q 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.

<1 / 1 000 000

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)

Duplication 8q; Trisomy 8q; 8q duplication;


Chromosome Disorders; Congenital and Genetic Diseases


Chromosome 8q duplication is a rare chromosome abnormality characterized by an extra copy (duplication) of genetic material on the long arm (q) of chromosome 8. The symptoms and severity depend on the size and location of the duplication, which genes are involved, and whether other chromosome abnormalities are also present. Some features only occur when a particular section of the chromosome is duplicated. Features that have been more commonly reported in people with a chromosome 8q duplication include developmental delay, learning difficulties, congenital heart defects, skeletal abnormalities, genital or urinary abnormalities, and distinctive facial features.[1][2]

Most cases of chromosome 8q duplication are not inherited from a parent and occur by chance in people with no family history of chromosome abnormalities. In some cases, one parent has a rearrangement of chromosomal material, such as a balanced translocation or inversion, that increases the risk to have a child with a chromosome 8q duplication.[1] Regardless of whether the duplication was inherited from a parent, a person with the duplication has an increased risk to have a child with a chromosome abnormality. Treatment is based on the signs and symptoms present in each person.


This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

Medical Terms Other Names
Learn More:
80%-99% of people have these symptoms
Abnormality of chromosome segregation
Dimple chin
Chin butt
Chin dent
Chin dimple
Chin skin dimple
Indentation of chin

[ more ]

Everted lower lip vermilion
Drooping lower lip
Outward turned lower lip

[ more ]

Global developmental delay
High forehead
Wide-set eyes
Widely spaced eyes

[ more ]

Long thorax
Long rib cage
Little lower jaw
Small jaw
Small lower jaw

[ more ]

Short neck
Decreased length of neck
Specific learning disability
Upslanted palpebral fissure
Upward slanting of the opening between the eyelids
Wide nasal bridge
Broad nasal bridge
Broad nasal root
Broadened nasal bridge
Increased breadth of bridge of nose
Increased breadth of nasal bridge
Increased width of bridge of nose
Increased width of nasal bridge
Nasal bridge broad
Wide bridge of nose
Widened nasal bridge

[ more ]

30%-79% of people have these symptoms
Abnormal oral frenulum morphology
Abnormality of cardiovascular system morphology
Bifid tongue
Cleft tongue
Forked tongue
Split tongue

[ more ]

Cleft palate
Cleft roof of mouth
Undescended testes
Undescended testis

[ more ]

Displacement of the urethral meatus
High palate
Elevated palate
Increased palatal height

[ more ]

Hypoplasia of penis
Underdeveloped penis
Joint stiffness
Stiff joint
Stiff joints

[ more ]

Low-set, posteriorly rotated ears
Non-midline cleft lip
Protruding ear
Prominent ear
Prominent ears

[ more ]

5%-29% of people have these symptoms
Bone cyst
Bone cysts
Short fingers or toes
Camptodactyly of finger
Permanent flexion of the finger
Deep palmar crease
Deep palm line


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 8q 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 8q.

      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.
      • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.
      • PubMed is a searchable database of medical literature and lists journal articles that discuss Chromosome 8q duplication. Click on the link to view a sample search on this topic.