A new research suggests that a hormone responsible for the onset of puberty can end up stuck in the wrong part of the body if the nerve pathways responsible for its transport to the brain fail to develop properly.
Scientists from University College London (UCL) traced how nerve cells responsible for regulating sexual reproduction in mice find their way from their birth place in the foetal nose to their site of action in the adult brain.
They found that if a certain molecule is missing, then these pathways are not formed correctly and gonadotropin releasing hormone (GnRH) can become lodged in the nose or the forehead, rather than in the brain, where it is needed to control the menstrual cycle in females and testosterone production in males.
"We discovered that a molecule essential for the growth of the nerve cables that transmit odour and pheromone signals from the nose to the brain is also crucial in the development of the highways responsible for transporting other nerve cells that make the sex hormone GnRH," said co-investigator Christiana Ruhrberg.
"We found that in mice with an inherited deficiency in the molecule SEMA3A, these highways did not lead to the brain, but instead formed impenetrable tangles outside the brain. This means that the nerve cells making GnRH are unable to get to their final destination and instead become stuck in the nose or forehead," he said.
As a result the researchers found that the testes of mice lacking SEMA3A did not grow properly and the adult males were infertile.
These findings have important implications for the study of Kallmann's syndrome and related genetic disorders that causes infertility.
The findings were published in Human Molecular Genetics.