They also stated, however, the same gene does not appear to be affected by the presence of dogs and if the variation of the TT gene is activated then the risk of asthma doubles and can also be responsible for bronchitis and pneumonia. Almost one in three children in the study carry the variant, which experts believe is parallel to the population in general.
They talked to Jakob Stokholm, who led the study at the Copenhagen Studies on Asthma in Childhood Research Center, who said: the explanation could be related to bacteria that cats carry and perhaps fungi or viruses that they bring into the home.
“If we can explain these mechanisms, it opens up opportunities to isolate them and to protect against the disease,” he also said. The TT gene variant was previously suspected to be involved in some way to asthma, bronchitis and pneumonia, however scientists did not know precisely how."
They also talked to Dr Anne Høst who co-led the research "It’s very exciting that they find this connection because other studies have struggled to conclude anything final, now it looks like the effect is linked to a particular gene-variant, which goes to show just how complex the development of asthma and allergies are," he added. "It’s not only about genes and the environment, but how the two interact, and there’s so much that we still don’t know.
Their figures showed that approximately 5.4 million people in the UK are currently receiving treatment for asthma, including more than 1.1 million - equivalent to one in 11 - children. When they talked to Professor Hans Bisgaard said the study showed in unprecedented detail how the environment affects the behaviour of genes, in particular in early life and during pregnancy. “For me, this is the core message because it’s a recognition in the direction of how disease occurs,” he said.