Is Bilateral Renal Agenesis hereditary?

Bilateral Renal Agenesis is a rare, life-limiting condition that is generally considered multifactorial rather than strictly hereditary, meaning it results from a complex interaction between genetic predispositions and environmental factors. While it can occur sporadically, there is an increased risk of recurrence in families, and genetic counseling is essential for understanding individual risks and potential underlying genetic syndromes.

Is Bilateral Renal Agenesis hereditary or genetic?

Bilateral Renal Agenesis is considered a congenital anomaly of the kidney and urinary tract (CAKUT). While the condition has a genetic component, it is rarely inherited in a simple Mendelian pattern (like purely autosomal dominant or recessive). Most cases of Bilateral Renal Agenesis occur sporadically as isolated events, but it can also present as part of a broader genetic syndrome, such as Renal-Coloboma syndrome or Branchio-Oto-Renal syndrome, which do follow specific inheritance patterns.

What is the risk of recurrence for future pregnancies?

For parents who have had one child with Bilateral Renal Agenesis, the recurrence risk for future pregnancies is generally estimated to be between 3% and 5%. However, this risk can vary significantly depending on whether the condition is isolated or associated with other developmental anomalies. Because Bilateral Renal Agenesis can be linked to various genetic pathways, families are encouraged to meet with a clinical geneticist to review their specific family history.

How is genetic testing used in Bilateral Renal Agenesis?

Genetic testing for Bilateral Renal Agenesis is increasingly used to identify potential underlying syndromes. Common approaches include:

• Chromosomal Microarray (CMA): To detect deletions or duplications of genetic material.


• Exome Sequencing: To identify rare, causative variants in specific genes associated with kidney development.


• Prenatal Diagnosis: If a family has a known genetic mutation, amniocentesis or chorionic villus sampling (CVS) can be performed in future pregnancies.

Are de novo mutations common?

Yes, de novo (new) mutations are common in many cases of Bilateral Renal Agenesis. These are genetic changes that occur for the first time in the affected individual and are not inherited from the parents. This explains why many families with a child affected by Bilateral Renal Agenesis have no prior family history of the condition.

Next steps

• Schedule a consultation with a clinical geneticist to discuss family history and testing options.


• Join the DiseaseMaps.org community to connect with 19 other members who share experiences with Bilateral Renal Agenesis.


• Consult with a maternal-fetal medicine specialist if planning a future pregnancy to discuss high-resolution ultrasound monitoring.

Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Renal Agenesis, Bilateral.


• Orphanet: Bilateral renal agenesis.


• OMIM (Online Mendelian Inheritance in Man): Renal Agenesis; RAG.


• National Kidney Foundation: Information on Congenital Anomalies of the Kidney and Urinary Tract (CAKUT).