Any evidence of elevated aggression from detected CDH13(cadherin) and MAOA1 genes from Sintashta samples?
Yesterday I was reading a chapter in a book on racial science and the nature-nuture debate, and one chapter in particular introduced me to what is known as the cadherin 13 and monoamine oxidase 1 genes(warrior genes supposedly): mind you I have a lot of science & history literature in my personal library at home, and today I started thinking about the ancient Sintashta population of the Ural Steppe-Forest zone, and began wondering if the Sintashta proclivity for warfare was possibly due to their being some sort of chemical imbalance from unstable levels of dopamine, serotonin, norepinephrine, and epinephrine among some of the male inhabitants of their population. My understanding is these neurotransmitters/brain chemicals are responsible for helping manage or control stress levels, and serotonin obviously is beneficial for sleep, but neurodevelopmental disorders such as antisocial behavior, violent impulse/aggressive behavior and ADHD/Autism stem from neurological dysfunction and disruption of normal brain activity... according to the author family cohesiveness, educational attainment and financial stability are effected by trauma, and due to the harsh environment of the Steppes, both its climate and the dangers that would have been encountered, human and animal it's possible this elevated stress levels in ancient Steppe populations, altering genes that inhibited proper neurotransmitter function, resulting in a more aggressive population in the Steppes, other than that it's possible that cultural forces played a role too, seeing how ancient Indo-European societies had a patriarchal-warrior-pastoral system under which they lived.
I'm just curious to know what some other people's thoughts are on this... can the presence of such genes even be detected from DNA samples taken from ancient human remains?
Is it possible that such genes sparked the creativity for some of the vehicular and militaristic innovations that the Sintashta came up with to give them an edge in warfare, in addition to the construction of the fortified industrial settlement at Sintashta?
Mind you the author states that increased crime in America in predominantly black communities between 2015-2016, and she cites a Finnish article from 2014, that an estimated 5-10% of Finnish convicts in Finland were purportedly the most violent in prison, is due to a higher frequency of the CDH13 and MAOA genes among that segment of the prison population, however she is explicit, that biology alone cannot account for why some individuals or populations are disproportionately more violent than others, because environmental stimuli are also a trigger for why some Individuals or particular ethnic-groups tend to be more violent.