Summary: Genomic research finds those who inherited a special ion channel from Neanderthals experience more pain.
Source: Max Planck Institute
As several Neandertal genomes of high quality are now available researchers can identify genetic changes that were present in many or all Neandertals, investigate their physiological effects and look into their consequences when they occur in people today. Looking into one gene that carries such changes, Hugo Zeberg, Svante Pääbo and colleagues found that some people, especially from central and south America but also in Europe, have inherited a Neandertal variant of a gene that encodes an ion channel that initiates the sensation of pain.
By using data from a huge population study in the UK, the authors show that people in the UK who carry the Neandertal variant of the ion channel experience more pain. “The biggest factor for how much pain people report is their age. But carrying the Neandertal variant of the ion channel makes you experience more pain similar to if you were eight years older”, says lead author Hugo Zeberg, a researcher at the Max Planck Institute for Evolutionary Anthropology and Karolinska Institutet. “The Neandertal variant of the ion channel carries three amino acid differences to the common, ‘modern’ variant”, explains Zeberg. “While single amino acid substitutions do not affect the function of the ion channel, the full Neandertal variant carrying three amino acid substitutions leads to heightened pain sensitivity in present-day people.”
On a molecular level, the Neandertal ion channel is more easily activated which may explain why people who inherited it have a lowered pain threshold. “Whether Neandertals experienced more pain is difficult to say because pain is also modulated both in the spinal cord and in the brain”, says Pääbo. “But this work shows that their threshold for initiating pain impulses was lower than in most present-day humans.”
About this evolutionary neuroscience research article
Source: Max Planck Institute Media Contacts: Hugo Zeberg – Max Planck Institute Image Source: The image is credited to Photo Library / Daynes, Elisabeth.
A Neanderthal Sodium Channel Increases Pain Sensitivity in Present-Day Humans
The sodium channel Nav1.7 is crucial for impulse generation and conduction in peripheral pain pathways. In Neanderthals, the Nav1.7 protein carried three amino acid substitutions (M932L, V991L, and D1908G) relative to modern humans. We expressed Nav1.7 proteins carrying all combinations of these substitutions and studied their electrophysiological effects. Whereas the single amino acid substitutions do not affect the function of the ion channel, the full Neanderthal variant carrying all three substitutions, as well as the combination of V991L with D1908G, shows reduced inactivation, suggesting that peripheral nerves were more sensitive to painful stimuli in Neanderthals than in modern humans. We show that, due to gene flow from Neanderthals, the three Neanderthal substitutions are found in 0.4% of present-day Britons, where they are associated with heightened pain sensitivity.