Around three quarters of the immune characteristics are influenced by the genes, finds a new study from the King's College London.
The research study provides evidence that the genetic influence in the immune system to be significantly higher than the previous thought.
The study was published in the journal Nature Communications.
They also highlight the importance of environmental influences such as our diet, on shaping the innate immunity (the simple core immune response found in all animals) in adult life.
The findings could help to improve understanding of the immune system and the interaction of environmental factors. It could also form the basis of further research into treatments for various diseases, including rheumatoid arthritis and psoriasis.
Dr Massimo Mangino, lead researcher from King's College London said: 'Our genetic analysis resulted in some unusual findings, where adaptive immune responses, which are far more complex in nature, appear to be more influenced by variations in the genome than we had previously thought. In contrast, variation in innate responses (the simple non specific immune response) more often arose from environmental differences. This discovery could have a significant impact in treating a number of autoimmune diseases.'
Professor Tim Spector, Director of the TwinsUK Registry at King's College London said: 'Our results surprisingly showed how most immune responses are genetic, very personalised and finely tuned. What this means is that we are likely to respond in a very individualised way to an infection such as a virus - or an allergen such as a house dust mite causing asthma. This may have big implications for future personalised therapy.'