Over 80 new genetic variants that strongly influence human height have been discovered in a study led by Queen Mary University of London (QMUL), Montreal Heart Institute, The Broad Institute and the University of Exeter.

The research, which was published in the journal Nature, is the largest genetic study of adult height to date, with the international team of researchers analysing DNA from over 700,000 participants across the globe to determine why people have different heights.

Adult height is mostly determined by the information encoded in our DNA – children from tall parents tend to be taller, and those from short parents are shorter. But growth from a small baby into an adult, and the role of genetics, is one of the most poorly understood areas of human biology.

Hundreds of DNA changes that influence height have already been identified, but these common DNA changes often influence height by less than 1 mm. In this new study, the scientists found new DNA changes that led to differences in height of up to 2 cm – over 10 times the average effect of previously discovered gene variants.

Senior co–lead author Professor Panos Deloukas from QMUL’s William Harvey Research Institute said: “The new genetic variants we found are rare in the population but their large effects on human height have revealed important new insights into human skeletal growth.

“The identified genes will be helpful in predicting a person’s risk of developing certain growth disorders. There is also the hope that we may one day be able to use this knowledge to develop a precision medicine approach for dealing with growth disorders.”

Dr Eirini Marouli, lead analyst in the study from QMUL, added: “It is for the first time that we have pinpointed such a large number of variants having a big effect on height. The design of large genetic studies constitutes a tremendous tool in our effort to understand the biology of common traits and diseases.”

Many of the 83 new DNA changes are located in genes implicated in growth or bone biology, but many also highlight new biological processes that modulate height in humans.

The researchers looked in more detail at two of the changes found in a gene called STC2. Only 1 person in 1,000 carries one of these genetic variants, but those who do are 1–2 cm taller.

Further investigations by researchers at Aarhus University, Denmark, suggested that these variants modulate height by interfering with the availability of growth factors in the blood. Studying STC2 may therefore yield new insights into therapeutic strategies to treat growth failure, which affects 3–5 per cent of all children.

Dr Andrew R Wood, co–lead analyst in the study at the University of Exeter said: “Our latest discovery means that we can now explain over a quarter of the heritable factors involved in influencing a person’s height. How the body grows from a 40–50 cm baby into a perfectly proportioned adult three to four times the size, and how this occurs such that some of us end up being over half a metre taller than others, is a fascinating but poorly understood aspect of biology.”

Professor Guillaume Lettre at Université de Montréal and the Montreal Heart Institute added: “In our study, we used adult height as a simple observable physical trait to understand how information in our DNA can explain how we are all different. The idea was that if we could understand the genetics of human height, we could then apply this knowledge to develop genetic tools to predict other traits or the risk of developing common diseases.”

The study was carried out using data from UK Biobank.