Instituto BernabeuRecessive diseases are hereditary diseases. They are not common but they are often serious and incurable. They have the peculiarity that a person may be a carrier but does have any health issues. It is for this reason that they are called ‘healthy carriers.’

This circumstance makes diagnosis particularly difficult since we can come across families in which there are entire generations without the disease or in which the disease has not previously come to light. As such, until recently, it was impossible or very difficult to know if a person was a carrier or not.

Most of us are healthy carries of some form of recessive disease and, on the whole, this is not an issue as long as our partner is not a carrier of the same disease, in which case there are implications for our children.

In those cases where both partners are healthy carriers of the same disease, there is a 25% risk that a child from that couple will develop that disease. Additionally, there is a 50% risk that the child will be a healthy carrier of the same disease as the parents and this also has implications for his/her children.

Studying carriers of recessive diseases initially began in order to analyse cases of couples and/or women undergoing treatment with donated gametes (both semen donation and egg donation). The aim is to select a donated gamete which is free of the same illness as the patient. This ensures that the child is not affected.

Nowadays, this is also possible in couples undergoing assisted reproduction treatment with their own gametes as well as in couples who do not have reproduction issues. Being a carrier has no connection to reproduction issues.

In Instituto Bernabeu, we carry out a genetic diagnosis of the 555 most common recessive diseases by means of a simple blood sample analysis. This enables us to know if we are recessive disease carriers or not. If we are not, the risk of our child having such an illness is practically non-existent.

If we are carriers of any of these diseases, a study of our partner is necessary in order to determine is he/she is a carrier of the same disease. If this is the case, there are measures which can be taken and treatments which can be given in order to avoid transmitting this disease to our children, meaning that they will be born free of it.

In short, this study enables us to know our condition as a recessive disease carrier, an issue which has implications for our children’s health. It therefore implies having the capacity to prevent and avoid these illnesses amongst our descendants. These are, on the whole, serious and often incurable diseases.

Dr. Andrea Bernabeu, PhD. Coordinator of the Genetics and Reproduction Assessment Unit of Instituto Bernabeu.

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