There isn't one single "serial killer gene," but research points to variations in the MAOA gene (Monoamine Oxidase A), nicknamed the "Warrior Gene," as a potential factor, especially when combined with childhood trauma, influencing aggression and impulsivity by affecting neurotransmitters like serotonin and dopamine. Other genes like CDH13, which affects brain connectivity, have also been linked to extreme violence, but genetics alone don't determine criminality; it's a complex mix of genes, environment (like abuse), and personality traits like low empathy (antisocial personality disorder).
They found it in Monoamine Oxidase A (MAOA), which has been credited with being the “most common denominator” amongst serial killers.
A further analysis found that two genes in particular, 'cadherin 13' (CDH13) - a gene involved in neural connectivity and 'monoamine oxidase A' (MAOA), a controller in dopamine levels in the brain, were associated with criminal behaviour.
Monoamine oxidase A gene (MAOA) predicts behavioral aggression following provocation.
The CDH13 gene codes for T-cadherin, a neuronal membrane adhesion protein essen- tial for brain connectivity and development. Genome-wide association studies in Finnish criminal populations identified CDH13 variants as specifically associated with extremely violent behavior, including homicide [8].
Psychopathy is characterized by callous affect, interpersonal manipulation, a deviant lifestyle, and antisocial behavior. Previous research has linked psychopathic traits to childhood trauma, but also to the upstream variable number tandem repeat (uVNTR) polymorphism of the monoamine oxidase A (MAOA) gene.
The God gene hypothesis proposes that human spirituality is influenced by heredity and that a specific gene, called vesicular monoamine transporter 2 (VMAT2), predisposes humans towards spiritual or mystic experiences.
There is no “psychopathy gene,” but research tells us that psychopathy tends to run in families. Even if a parent does not have psychopathy, they may carry one or more genetic variants that increase their child's chance of developing psychopathy.
However, very few serial killers are considered mentally ill enough to be declared legally insane. Rather, the majority display signs of psychopathy or sociopathy; in terms of diagnosis, they may meet the criteria for antisocial personality disorder.
Monoamine oxidase A gene (MAOA) has earned the nickname “warrior gene” because it has been linked to aggression in observational and survey-based studies.
CDH13 was identified as a ADHD-related gene in 2008, and it is one of the most important genes associated with ADHD,26 which is a disorder strongly associated with violent criminality.
Myth 1: The MAOA “warrior gene” is rare
Fact: We all carry the MAOA gene, just some of us have a form which may be linked with aggression.
They took her to the hospital for her concussion, and while she was there for an extended stay the doctors did some real quick genetic testing (a totally normal thing to do for someone with a concussion), and discovered that Betty has the MAOA and CDH13 genes.
Monoamine oxidase A (MAOA), often referred to as the "warrior gene," is an enzyme encoded by a gene located on the X chromosome in humans and some primates.
Fitzgerald (2010) has suggested that Autistic Psychopathy may underlie the motivation of some of these serial killers. He suggests a new diagnosis Criminal Autistic Psychopathy, a subcategory of Asperger's syndrome.
A simple DNA test can determine a man's MAOA gene version and the two possible versions for women. Knowing this can provide insights into potential genetic tendencies.
A recent study reported individuals with schizophrenia are approximately 20 times more likely to commit homicide than the general population (Fazel, Gulati, Linsell, Geddes & Grann, 2009). Similarly, Schanda et al. (2004) revealed an increased likelihood of homicide in women suffering from schizophrenia.
In classifying types of serial murder, the factors discussed are behavioral background, victim profiles, methods used, and location of the murders. Four types of serial murderers are identified: the 'visionary,' the 'mission-oriented,' 'hedonistic,' and 'power/control-oriented.
Indeed, recent research on the relationships between intelligence measures and the Psychopathy Checklist Revised (PCL-R: Hare, 2003) indicates that the association is generally weak, and Hare and Neumann (2008) concluded that there is little reason to believe that psychopathic individuals possess superior intelligence.
Psychopathy is a cluster of serious antisocial traits. There is evidence that it might be genetic. There is also evidence, including some from new research, that the environment might help cause it. The best explanation may be that psychopathy is the result of a specific combination of nature with nurture.
20 Signs of a Psychopath
As part of his conception Mary was either altered to have X and Y gametes, or was implanted with an Y gamete to make her conceive. Jesus had de la Chapelle syndrome, wherein he had XX chromosomes but still grew up developing male sex characteristics.
Your biological father can pass on physical traits such as your biological sex, eye color, height, puberty timing, fat distribution, dimples, and even risk factors for certain health conditions.
Saying humans are 98% chimpanzee means we share nearly all our DNA with chimps, reflecting our very recent common ancestor, while saying we're 50% banana means we share about half our genes, but these are ancient, fundamental genes for basic cell functions (like making energy), showing the deep evolutionary link between all life from a distant common ancestor, not that we're physically half-fruit. It's a comparison of different types of genetic similarities, highlighting our close primate cousinship versus our shared fundamental biology with plants, according to Pfizer.