Compound heterozygosity

Compound heterozygosity is a condition that occurs when an individual has inherited different forms of a particular gene from each parent. This can lead to various genetic disorders, depending on the specific genes involved.

Definition

Compound heterozygosity is a situation in which an individual has two different mutant alleles at a particular gene locus, one on each chromosome of a pair. The individual is a compound heterozygote, having inherited the different mutations from each parent. This is in contrast to a simple heterozygote, who has one mutant and one normal allele.

Genetic Disorders

Compound heterozygosity can lead to various genetic disorders. For example, it is a common cause of cystic fibrosis, a serious genetic disorder that affects the lungs and digestive system. Other disorders that can result from compound heterozygosity include sickle cell disease, thalassemia, and phenylketonuria.

Diagnosis

The diagnosis of compound heterozygosity typically involves genetic testing. This can include sequencing of the relevant gene, or more comprehensive genome sequencing. The results can then be used to determine the specific mutations present and their potential effects.

Treatment

The treatment for conditions resulting from compound heterozygosity depends on the specific disorder. For example, cystic fibrosis may be treated with medications to manage symptoms, physical therapy to improve lung function, and in some cases, lung transplantation.

See Also

• Genetic disorder
• Genetic testing
• Genome sequencing