The Genetic Basis of Altruism: Do Our Genes make us Empathetic?

Empathy consists of two components: (1)the ability to understand another person’s thoughts and feelings (cognitive empathy) and (2) the capacity to respond appropriately with emotion to those thoughts and feelings (affective empathy). These elements together form the foundation of human connection and social interaction. It has been argued that those who exhibit empathy also exhibit higher levels of cognitive ability as they show a development outside of the egocentric stage as well as it expresses the individual’s ability to learn from experience and to adapt to, shape, and select environments.

Altruism is defined as a selfless concern for the well-being of others. However, its existence as a pure concept is widely debated. Pure altruism involves acts of giving without any expectation of reward, recognition, or personal benefit. Critics argue that even seemingly selfless acts may be motivated by a natural sense of reward, as helping others often provides a sense of personal satisfaction or fulfillment. According to this perspective, altruism may align with the concept of homo-economicus, which portrays humans as rational beings driven by self-interest. In this view, altruistic behavior may simply be another form of self-serving action that ultimately benefits the giver as much as the recipient.

I believe that you can not have one without the other, which is why I will be going over both,or using them interchangeably, since both of these behaviors involve recognition of something outside of yourself and having the ability to take into account others’ perspective effects in mind.

These humanistic traits have often been described as more pronounced in some individuals compared to their peers, with some even arguing that certain sexes may exhibit greater empathy or altruism than others. This sparked my curiosity about whether these characteristics are primarily shaped by upbringing and environment or are inherited through genetics. By finding a genetic basis there may be a form of validation for the sensitive people in today’s world.

Acknowledgment

So far, traits can only be assessed through self-reporting, as there is no precise or objective method to measure levels of empathy and altruism. Consequently, the results may be skewed, and variations in how individuals define these attributes must also be considered when interpreting the findings. A Factor that this paper does not fully discuss, is the environmental and cultural factors involved within the development of these behaviors.

The Link Between Genetics and Behavior

The relationship between genetics and behavior can be explored through mechanisms like cellular memory, transgenerational epigenetic inheritance, and maternal imprinting. These processes highlight how gene expression and environmental factors intertwine to influence behavior across generations. Epigenetic inheritance involves transferring information from one generation to the next without altering the DNA sequence itself. DNA methylation (DNAm) is a key heritable epigenetic mark, with potential implications for psychiatric conditions. Parent-of-origin effects, as seen in disorders like Prader-Willi and Angelman syndromes, illustrate how the same genetic deletion can manifest differently based on whether it is inherited from the mother or father. This is due to imprinting, a process that distinguishes maternally and paternally derived chromosomes and influences gene expression.

Studies in rats have demonstrated how maternal behaviors like licking and grooming (LG) and arched-back nursing (ABN) can alter stress responses in offspring. High-LG-ABN mothers raise offspring with reduced stress reactivity and smaller HPA axis responses, while low-LG-ABN mothers produce offspring with heightened stress reactivity. These behaviors during the first week of life initiate changes in the offspring’s hippocampal expression of the glucocorticoid receptor (GR) gene, which regulates the stress response. Maternal LG-ABN behaviors increase serotonin (5-HT) levels, activating pathways that enhance the expression of nerve growth factor-inducible protein A (NGF1-A), a transcription factor. This process boosts GR gene expression in the hippocampus. Specifically, a non-coding region of the GR gene (exon 1, sub 7), sensitive to NGF1-A, is upregulated. Offspring of high-LG-ABN mothers show higher GR expression, improving feedback sensitivity in the stress response. When GR levels are equalized experimentally, the differences in stress responses disappear, underscoring GR’s role as a critical mediator.

These findings emphasize the interplay between genetic and environmental influences on behavior. Maternal care acts as a non-genomic mechanism transmitting differences in stress reactivity across generations. While the underlying genes are not altered, their expression is modulated through epigenetic marks, revealing how inherited and environmental factors collaborate to shape behavioral outcomes. (Caldji, C, et al.).

Scientific Literature

While kindness and selflessness are often viewed as learned traits, recent research paints a more nuanced picture, revealing reciprocity between nature and nurture.

A study by Smith, Karen E, et al, investigates the genetic basis of empathy. This study examines the connection between the oxytocin receptor (OXTR) gene polymorphism (Val158Met) and empathy using a meta-analysis approach. By aggregating data from multiple studies, the researchers evaluated the relationship between this specific gene variant and various measures of empathy, such as tasks assessing the ability to recognize or understand others’ emotions. The key finding was that individuals with the Met allele of the OXTR gene exhibited lower levels of empathy compared to those with the Val allele. However, the effect size was small, suggesting that while the OXTR gene may influence empathy, its impact is modest. This research shows the complexity of the genetic basis of empathy, indicating that genes like OXTR likely interact with other genetic and environmental factors to shape empathetic behavior (Smith, Karen E, et al.).

A different study Reuter, Martin, et al in 1993, titled “Investigating the Genetic Basis of Altruism: The Role of the COMT Val158Met Polymorphism” (PMC3190209), does not directly explore empathy through genetic analysis. Instead, it focuses on the COMT Val158Met polymorphism ( a genetic variation that affects dopamine metabolism) and its potential link to altruistic behavior. Unlike studies that utilize genome-wide association studies (GWAS) or self-reported empathy measures, this research examines the relationship between dopamine regulation and altruism. Dopamine is a neurotransmitter associated with reward and social interaction, and is thought to play a role in empathy, as empathetic responses can be seen as natural rewards. Since the COMT gene influences dopamine metabolism, variations like the Val158Met polymorphism may affect dopamine levels, potentially impacting behaviors related to empathy. This study also explored the heritability of empathy and altruism through twin studies. The findings indicated that roughly 50% of the variation in these behaviors can be attributed to genetic factors, with the other 50% shaped by environmental influences. This demonstrates a notable genetic contribution, while still underscoring the crucial role of life experiences in shaping empathy and altruistic tendencies (Reuter, Martin, et al.).

Another study, published in Translational Psychiatry, investigated the genetic basis of self-reported empathy using data from 46,861 participants on the 23andMe research platform. Researchers employed a GWAS to analyze millions of genetic variations across the human genome, using the Empathy Quotient (EQ) to measure participants’ self-perceived empathy levels ( this assessment tool is flawed however, assuming that those with autism spectrum disorder (ASD) do not experience empathy and that is not the case). While no single nucleotide polymorphisms (SNPs) reached genome-wide significance, several suggestive loci were identified, including a notable SNP on chromosome 8. The study confirmed a significant female advantage in empathy scores and indicated a modest but meaningful heritability of self-reported empathy, suggesting that some variation in empathy may be linked to genetic factors (Warrier, Varun et al.).

Research suggests a complex relationship between genetic and environmental factors in shaping empathy. While specific genes and their mechanisms remain to be fully explained, studies have identified potential links between genetic variations and empathy. While genetic factors may provide a predisposition, environmental factors such as upbringing, social experiences, and cultural influences also play crucial roles in shaping empathy.

Discussion

Empathy and altruism are deeply interconnected traits that rely on an individual’s ability to recognize perspectives beyond their own to form the foundation for human connection and social interaction. These nuanced behaviors are influenced by both genetic and environmental factors. Studies exploring the oxytocin receptor (OXTR) gene polymorphism (Val158Met) suggest that individuals with the Met allele may exhibit lower empathy levels compared to those with the Val allele, although the effect size is modest. Other research, such as Cloninger et al.’s investigation into the COMT Val158Met polymorphism, highlights how variations affecting dopamine metabolism can be linked to altruistic behavior, suggesting that dopamine plays a role in reward-related social interactions. Twin studies support a genetic basis, attributing approximately 50% of empathy and altruism variability to heredity, while the other half is shaped by environmental experiences. Additionally, GWAS reveal suggestive loci for empathy, indicating modest but meaningful heritability.

The dynamic between genetics and environment can also be observed through epigenetic mechanisms like maternal imprinting and transgenerational inheritance. For instance, maternal behaviors in rats, such as grooming and nursing, have been shown to influence stress responses in offspring by altering the expression of the glucocorticoid receptor (GR) gene. These findings underscore how gene expression, rather than the genes themselves, can be shaped by environmental factors. While genetic predispositions may lay the foundation for empathy and altruism, upbringing, social experiences, and cultural influences ultimately shape how these traits manifest. Further research is essential to fully understand the complex relationship between genes and environment in shaping human capacity for empathy and altruistic behavior.

Citations

Baron-Cohen, Simon, et al. “Empathy Quotient (EQ).” Psychology Tools, Psychology Tools, 1 Jan. 1970, psychology-tools.com/test/empathy-quotient .

Caldji, C, et al. “Maternal Care during Infancy Regulates the Development of Neural Systems Mediating the Expression of Fearfulness in the Rat.” Proceedings of the National Academy of Sciences of the United States of America, U.S. National Library of Medicine, 28 Apr. 1998, pmc.ncbi.nlm.nih.gov/articles/PMC20261/.

Reuter, Martin, et al. “Investigating the Genetic Basis of Altruism: The Role of the COMT VAL158MET Polymorphism.” Social Cognitive and Affective Neuroscience, U.S. National Library of Medicine, Oct. 2011, pmc.ncbi.nlm.nih.gov/articles/PMC3190209/.

Smith, Karen E, et al. “Oxytocin Receptor Gene Variation Predicts Empathic Concern and Autonomic Arousal While Perceiving Harm to Others.” Social Neuroscience, U.S. National Library of Medicine, Feb. 2014, pmc.ncbi.nlm.nih.gov/articles/PMC3923324/.

Warrier, Varun, et al. “Genome-Wide Analyses of Self-Reported Empathy: Correlations with Autism, Schizophrenia, and Anorexia Nervosa.” Nature News, Nature Publishing Group, 12 Mar. 2018, www.nature.com/articles/s41398-017-0082-6.