What is Surrogacy?

Does a Baby Inherit DNA from a Surrogate Mother?

Surrogacy is one of the primary methods for overcoming infertility. However, this method raises many questions, particularly concerning the surrogate mother's genetic contribution to the child's DNA. What exactly is passed from the surrogate to the baby, and why is DNA testing necessary in surrogacy arrangements? Let's explore these questions in detail, including the fundamental principles of genetics and biology.

What is Surrogacy?

Surrogacy is a method of assisted reproductive technology (ART) in which a woman (the surrogate mother) voluntarily agrees to carry and give birth to a child for another person or couple. Conception occurs in a laboratory via in vitro fertilization (IVF). After a few days, the embryo is transferred to the uterine cavity for implantation and pregnancy. Infertile couples and single women turn to surrogacy when carrying a child is medically impossible for the biological mother — for instance, due to a hysterectomy or other conditions that contraindicate pregnancy.

Surrogacy can be traditional or gestational. The primary difference lies in whose egg is fertilized, which determines the child's genetic heritage:

• Traditional: The surrogate's egg is fertilized with the father's (or a donor's) sperm. In this case, the surrogate is the egg donor and the child's genetic parent. This approach is extremely rare and prohibited in several countries.

• Gestational: The biological mother's egg and the biological father's (or a donor's) sperm are used. The embryo's genetic material is entirely inherited from the biological parents; the surrogate only provides the optimal environment for fetal development and has no genetic link to the child.

Since the gestational type is most common, the main question is how the surrogate might influence the child's genome.

Genetics Fundamentals: Where Do Genes Come From?

Every individual receives half of their genetic information from their mother and half from their father. This process begins with the union of two gametes: the sperm and the egg. The genetic material of these cells—DNA—forms a unique new set of chromosomes that determines physical traits (eye color, height), physiological features (predisposition to diseases), and even certain behavioral characteristics. This DNA, encoded in the cell nucleus, remains unchanged from the moment of fertilization throughout life. Thus, genetic information is established at conception and is determined exclusively by the biological parents' DNA.

Epigenetics: The Role of the Environment

In gestational surrogacy, the child inherits no genes from the surrogate. However, the gestation period can influence development through epigenetics.

Epigenetics is the study of changes in gene expression—how genes are "turned on" or "off" — without altering the DNA sequence itself. These changes can be triggered by:

• Nutrition;

• Emotional state and stress levels;

• Medication or habits;

• Environmental conditions.

The surrogate provides the fetus with nutrients, oxygen, and hormones essential for development. These substances can influence epigenetic mechanisms like DNA methylation or histone modification. Such regulation can affect organ development, disease predisposition, and future behavior. For example, a lack of nutrients may alter metabolism genes, increasing obesity risks, while high stress might activate genes linked to anxiety. Importantly, epigenetic modifications only regulate how existing genes work; they do not change the DNA itself.

Mitochondrial DNA

Mitochondria are cell organelles responsible for energy production. They contain a small amount of DNA inherited exclusively from the mother's egg. Since a gestational surrogate does not provide the egg, she does not pass her mitochondrial DNA to the child.

DNA Testing in Surrogacy

DNA tests are necessary to establish biological kinship between the child and the intended parents, as well as to detect potential genetic anomalies (e.g., Down syndrome, Edwards syndrome). In some jurisdictions, DNA analysis is a mandatory requirement for establishing parental rights. For example, in Russia (per Government Decree No. 882) or in certain US states (for citizenship purposes when using international surrogacy).

Typically, the test is performed immediately after birth using biological samples (usually buccal swabs or blood) from the child and the intended parents.

Conclusion

Genetic information is formed solely from the DNA of biological parents or donors. In gestational surrogacy, the child does not inherit the surrogate's DNA, though epigenetic influences are possible. To mitigate risks, it is vital to choose a surrogate carefully and provide her with quality medical care and psychological support.

If you are looking for a surrogate mother or intended parents, contact FetusPlus. We provide a full range of services, ensuring comfort, confidentiality, and care at every stage. Your happiness is our ultimate goal.