Explore Fabry Disease Causes and Genetic Risk Factors

Fabry disease is a rare inherited disorder caused by changes in the GLA gene, which affects the body’s ability to produce an enzyme called alpha galactosidase A. Reduced enzyme activity can lead to the buildup of a fatty substance called globotriaosylceramide in cells and tissues. The condition may affect the kidneys.

Fabry disease is a lysosomal storage disorder caused by pathogenic variants in the GLA gene. This gene provides instructions for producing alpha galactosidase A, an enzyme involved in breaking down certain fatty substances. When the enzyme is deficient or has significantly reduced activity, these substances can accumulate within cells over time. The resulting buildup can affect multiple organs and contribute to the varied symptoms associated with Fabry disease. The severity and age of onset can differ considerably between affected individuals.

Explore the Genetic Causes of Fabry Disease

Fabry disease develops because of a disease-causing change, or variant, in the GLA gene. The gene is located on the X chromosome. Since males typically have one X chromosome, a pathogenic GLA variant on that chromosome can result in reduced or absent alpha galactosidase A activity. Females typically have two X chromosomes, so the effects of a GLA variant can vary depending on X chromosome inactivation and other biological factors.

Important genetic considerations include:

  • GLA gene variants: Different pathogenic variants can interfere with the production or function of alpha galactosidase A.
  • X linked inheritance: Fabry disease follows an X linked inheritance pattern rather than the typical dominant or recessive patterns associated with many other genetic conditions.
  • Family transmission: An affected parent can pass a disease causing GLA variant to their children.
  • Variable effects in females: Females with a GLA variant may experience symptoms ranging from mild to significant because of differences in X chromosome activity.
  • New genetic variants: In some families, Fabry disease can occur without a previously recognized family history because of a newly identified variant or because earlier relatives were undiagnosed.

Because Fabry disease can be inherited, identifying a pathogenic GLA variant in one family member may have implications for biological relatives.

Explore Risk Factors and Family Inheritance

The primary risk factor for Fabry disease is having a pathogenic variant in the GLA gene. Unlike many common diseases, lifestyle factors such as diet, exercise, or smoking do not cause Fabry disease. A person's genetic background and family inheritance are central to determining whether they have the condition.

Several factors can increase the likelihood that someone may have an inherited GLA variant:

  • Family history: Having a biological relative diagnosed with Fabry disease can increase the likelihood of carrying the same genetic variant.
  • Affected mother: A mother with a pathogenic GLA variant can potentially pass the variant to sons and daughters.
  • Affected father: A father with a pathogenic GLA variant passes his X chromosome to his daughters but not his sons.
  • Unexplained organ problems: Kidney, heart, or neurological findings occurring alongside other characteristic features may sometimes prompt evaluation for Fabry disease.
  • Known familial variant: Individuals related to someone with a confirmed disease causing GLA variant may be considered for targeted genetic testing.

Genetic counseling can help families understand inheritance patterns and discuss appropriate testing. Diagnosis may involve genetic testing, enzyme activity testing, clinical assessment, and evaluation of relevant organs. Testing approaches can differ between males and females.

Fabry disease can sometimes remain unrecognized for years because symptoms overlap with those of other conditions. Recognizing the genetic basis of the disorder and considering family history can therefore be important when appropriate clinical findings are present.

Fabry disease is primarily caused by pathogenic variants in the GLA gene, which lead to reduced activity of alpha galactosidase A and accumulation of certain fatty substances in cells. Its X linked inheritance pattern means that males and females can experience the condition differently. A family history of Fabry disease or a known GLA variant may indicate a need for genetic evaluation of relatives. Understanding these causes and risk factors provides useful information for recognizing inherited patterns and discussing appropriate testing with qualified healthcare professionals.

Related Articles