Chromosome 9p duplication
Alternate names[edit | edit source]
Duplication 9p; Trisomy 9p; 9p duplication; 9p trisomy; Partial trisomy 9p
Definition[edit | edit source]
Chromosome 9p duplication is a chromosome abnormality that occurs when there is an extra copy of genetic material on the short arm (p) of chromosome 9.
Cause[edit | edit source]
This condition occurs when there is an extra copy of genetic material on the short arm (p) of chromosome 9.
Inheritance[edit | edit source]
- Chromosome testing of both parents can provide more information on whether or not the duplication was inherited.
- In most cases, parents do not have any chromosomal anomaly.
- However, sometimes one parent is found to have a balanced translocation, where a piece of a chromosome has broken off and attached to another one with no gain or loss of genetic material.
- The balanced translocation normally does not cause any signs or symptoms, but it increases the risk for having an affected child with a chromosomal anomaly like a duplication.
Signs and symptoms[edit | edit source]
- 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 often occur in people with chromosome 9p duplication include developmental delay, intellectual disability, behavioral problems and distinctive facial features.
Diagnosis[edit | edit source]
Chromosome disorders may be suspected in people who have developmental delays, intellectual disabilities and/or physical abnormalities.
Several types of genetic tests can identify chromosome disorders:
- Karyotyping
- Microarray (also called array CGH)
- Fluorescence in situ hybridization (FISH)
Treatment[edit | edit source]
Treatment is based on the signs and symptoms present in each person.
NIH genetic and rare disease info[edit source]
Chromosome 9p duplication is a rare disease.
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