Chromosome 15q deletion

Alternate names

Deletion 15q; Monosomy 15q; 15q deletion; 15q monosomy; Partial monosomy 15q

Definition

Chromosome 15q deletion is a chromosome abnormality that occurs when there is a missing copy of the genetic material located on the long arm (q) of chromosome 15.

Cause

This condition occurs when there is a missing copy of the genetic material located on the long arm (q) of chromosome 15.

Inheritance

Most cases are not inherited, but people can pass the deletion on to their children.

Signs and symptoms

• Features that often occur in people with chromosome 15q deletion include developmental delay, intellectual disability, behavioral problems, and distinctive facial features.

Diagnosis

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:

• Karyotype - a karyotype is a laboratory test that produces an image of a person's chromosomes. This test can be used to diagnose large deletions.
• FISH - a laboratory technique that is used to detect and locate a specific DNA sequence on a chromosome. During FISH, a chromosome is exposed to a small DNA sequence called a probe that has a fluorescent molecule attached to it. The probe sequence binds to its corresponding sequence on the chromosome. This test can be used in combination with karyotyping for deletions that are too small to be seen on karyotype, alone. However, FISH is only useful if the person ordering the test suspects there is a deletion of a specific region of 4q.
• Array CGH - a technology that detects deletions that are too small to be seen on karyotype.

Treatment

Treatment is based on the signs and symptoms present in each person.

NIH genetic and rare disease info

• NIH info on Chromosome 15q deletion

Chromosome 15q deletion is a rare disease.

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