You May Be a Carrier of a Genetic Disease Without Ever Knowing It
What Is a Genetic Carrier?
A genetic carrier is a person who carries a hidden disease-causing gene variant but does not show symptoms of the condition. As a result, carriers may appear completely healthy and may never realise that they carry the gene.
However, the genetic variant can be passed on to their children. When both parents carry a variant associated with the same recessive genetic disorder, their child may be at risk of developing the condition.
For each pregnancy in which both parents carry the same autosomal recessive disorder, there is generally:
๐ A 25% chance that the child will inherit the condition
๐ A 50% chance that the child will be a carrier
๐ A 25% chance that the child will inherit neither disease-causing variant
These probabilities apply separately to each pregnancy.
Genetic Carrier Rates Among Thai People
Recent research involving 1,642 Thai participants found that approximately 39%, or nearly two in five people, carried at least one genetic condition when G6PD deficiency was included.
Even when thalassaemia was excluded, approximately 14.7% of participants were found to carry at least one genetic condition.
Nearly 2% of couples were identified as being at risk of having an affected child because both partners carried genetic variants associated with the same disease.
These figures show that hidden genetic variants are more common than many people realise. Not undergoing testing does not mean that no genetic risk is present.
What Is Carrier Screening?
Carrier screening is a genetic test used to identify whether a person carries gene variants associated with inherited conditions.
It is particularly useful for couples who are planning a family and want to better understand the possibility of passing a genetic disorder to their children.
Carrier screening may be performed:
๐ Before pregnancy
๐ During the early stages of pregnancy
๐ Before fertility treatment such as IVF
๐ When there is a family history of genetic disease
๐ When partners come from populations with a higher prevalence of certain inherited conditions
Benefits of Carrier Screening
๐ The test generally needs to be performed only once because inherited genetic information does not normally change throughout life.
๐ It helps couples understand their reproductive risks more clearly.
๐ It supports more informed family-planning decisions.
๐ It may reduce the risk of unexpectedly passing a serious inherited condition to a child.
๐ It allows couples to consult genetic specialists and consider available reproductive options when both partners carry the same condition.
Why Should Carrier Screening Be Considered Before Pregnancy?
Carrier screening is an important part of preconception planning because it can help couples:
๐ Understand their individual and combined genetic risks
๐ Make informed decisions about having children
๐ Prepare for pregnancy with greater confidence
๐ Plan appropriate testing or medical care at an early stage
๐ Prepare for the future health needs of their child
When both partners are carriers of the same genetic condition, a doctor or genetic counsellor can explain possible options. These may include prenatal diagnostic testing, IVF with preimplantation genetic testing, the use of donor eggs or sperm, or proceeding with pregnancy while preparing appropriate medical care.
Carrier status does not mean that a person is ill or that their child will definitely develop a genetic disorder. It provides important information that allows couples to understand their risks and make decisions that are appropriate for their family.
Reference :
N Health
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