Health Topics
Normal Function
The DNAH5 gene provides instructions for making a protein that is part of a larger group of proteins (a complex) called dynein. This complex functions within cell structures called cilia. Cilia are microscopic, finger-like projections that stick out from the surface of cells. They are found in cells that line the airway, the reproductive system, and many other organs and tissues. Coordinated back and forth movement of cilia can move the cell or the fluid surrounding the cell. Dynein makes up the structures (arms) that produce the force needed for cilia to move.
Dynein forms structures known as inner dynein arms (IDAs) and outer dynein arms (ODAs) within the core of many cilia (the axoneme). Coordinated movement of the dynein arms causes the entire axoneme to bend back and forth. Within IDAs and ODAs, dynein is made up of different combinations of protein components (subunits) that are classified by weight as heavy, intermediate, or light chains. The DNAH5 gene provides instructions for making the heavy chain 5 protein, which is found in ODAs. Other subunits are produced from different genes.
Health Conditions Related to Genetic Changes
Primary ciliary dyskinesia
Variants (also called mutations) in the DNAH5 gene have been found to cause primary ciliary dyskinesia, which is characterized by respiratory tract infections, abnormally placed internal organs, and difficulties having biological children (decreased fertility). Variants in the DNAH5 gene cause cells to produce fewer functional heavy chain 5 proteins. Without this subunit, dynein cannot assemble properly, and the ODAs may be shorter than usual or absent. As a result, cilia cannot produce the force needed to bend back and forth, which leads to the various features of primary ciliary dyskinesia.
More About This Health ConditionHeterotaxy syndrome
MedlinePlus Genetics provides information about Heterotaxy syndrome
More About This Health ConditionOther Names for This Gene
- DNAHC5
- dynein heavy chain 5
- dynein, axonemal, heavy chain 5
- dynein, axonemal, heavy polypeptide 5
Additional Information & Resources
Tests Listed in the Genetic Testing Registry
Scientific Articles on PubMed
Catalog of Genes and Diseases from OMIM
References
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