Chromosome 22, trisomy q11 q13

Chromosome 22, trisomy q11.2-q13 is a rare chromosomal disorder where an individual has an extra copy of the genetic material from the long arm (q arm) of chromosome 22, specifically between regions q11.2 and q13. This condition is a form of chromosomal abnormality that can lead to various developmental and physical abnormalities. The presence of a third copy of this specific segment of chromosome 22 can disrupt normal development and function, leading to a spectrum of possible health issues and characteristics.

Symptoms and Characteristics

The symptoms and characteristics of Chromosome 22, trisomy q11.2-q13 can vary widely among affected individuals. Common features may include developmental delay, intellectual disability, congenital heart defects, and distinct facial features such as a long face, small ears, and a bulbous nose. Other possible features include feeding difficulties, growth retardation, and skeletal anomalies. Due to the variability in expression, some individuals may have mild symptoms, while others may experience more severe manifestations.

Causes

Chromosome 22, trisomy q11.2-q13 is caused by a random error in cell division, either during the formation of reproductive cells or in early fetal development. This error results in an extra copy of a portion of chromosome 22. The specific reason why this cell division error occurs is not well understood, but it is not typically inherited from the parents.

Diagnosis

Diagnosis of Chromosome 22, trisomy q11.2-q13 involves genetic testing to identify the extra chromosomal material. Prenatal testing through amniocentesis or chorionic villus sampling (CVS) can detect chromosomal abnormalities before birth. After birth, a blood test can be used to analyze the child's chromosomes (karyotyping) if this condition is suspected based on physical symptoms and developmental delays.

Treatment

There is no cure for Chromosome 22, trisomy q11.2-q13, and treatment focuses on managing symptoms and supporting the individual's development. This may include early intervention programs, special education services, and therapies such as speech therapy, physical therapy, and occupational therapy. Medical management of specific symptoms, such as heart defects, may require surgical interventions or other treatments.

Prognosis

The prognosis for individuals with Chromosome 22, trisomy q11.2-q13 varies depending on the severity of symptoms and the presence of congenital anomalies. With appropriate support and treatment, many individuals can lead fulfilling lives. However, those with significant health issues may have a reduced lifespan and require ongoing medical care.

See Also

• Chromosomal abnormalities
• Genetic disorder
• Trisomy