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Resilience may sit in a single SNP.

Resilience — pressing on through hardship — is a measurable trait. In a genome-wide analysis of an African American population, researchers identified one new gene locus, rs322931, associated with positive affect. People carrying the minor (less common) allele also showed less negative affect, more spiritual well-being, and more resilience.

The proposed mechanism: rs322931 may influence positive affect via the brain's reward feedback loop. The microRNAs modulated by rs322931 are also induced by narcotics like co***ne and amphetamine — which hijack the same reward loop to drive addiction. So the same circuit that's targeted by drug-driven highs may be quietly tuning whether you bounce back from setbacks.

Sample of 3,728 is on the smaller side for GWAS, so only one locus was identified. But mapping a trait this abstract onto a single SNP is a noteworthy starting point.

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Reference: Genome-wide association study of positive emotion identifies a genetic variant and a role for microRNAs.

Grip strength has 16 genetic loci behind it.

Researchers identified 16 specific loci tied to grip strength (a standard proxy for muscular strength) and tested how grip strength causally relates to disease. They found a negative correlation between grip strength and adverse cardiometabolic events — meaning higher grip strength tracks with lower cardiovascular risk.

Put differently: a chunk of cardio protection might come from the genetic luck of being strong, on top of the protection you can build by training. The work hints at a future where personalized fitness regimens could use someone's strength-related variants to design training.

U.S. Bureau of Labor Statistics projects personal-training jobs to grow 24% (2010–2020) — far outpacing the 14% average across occupations.

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Reference: Biological Insights Into Muscular Strength: Genetic Findings in the UK Biobank.

Facial attractiveness has two specific genes behind it.

Attractiveness affects everything from school performance to careers, and the global cosmetic industry is a $500B testament to how much it's valued. Hu and colleagues used more than 4,000 Wisconsin high school graduates of European descent to identify gene loci linked to facial attractiveness.

Two loci were statistically significant: ANTXRLP1 (a pseudogene near ANTXRLP, which is tied to skin pigmentation) and CDC42EP3 (tied to height, near LINC00211). Splitting by s*x revealed different patterns — female facial attractiveness was negatively associated with BMI (lower BMI tracked with higher attractiveness scores), while male facial attractiveness was positively associated with blood cholesterol (which is involved in testosterone production).

The study has limited diversity, but it's one of the first to flag specific genetic contributors to perceived attractiveness.

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Reference: Genome-wide association study reveals s*x-specific genetic architecture of facial attractiveness.

Whether fear bounces back after extinction may be genetic.

Exposure therapy works by creating new memories that compete with the original fear — but for many PTSD patients, fear comes back. Researchers tested 91 healthy Han Chinese men using a fear-conditioning task: visual stimuli, some paired with electric shocks, followed by a memory-extinction phase where the visual cue and shock were uncoupled.

People with the GG genotype at a locus in ADRB2 (beta-2 adrenergic receptor) were more susceptible to fear resurgence even after extinction. A-allele carriers were less prone to fear coming back. ADRB2 has been previously tied to PTSD — among people who experienced childhood trauma, that same locus predicts who develops PTSD.

Sample is on the smaller side for this kind of analysis, but the result helps inform who might respond differently to exposure-based therapies.

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Reference: ADRB2 gene polymorphism modulates the retention of fear extinction memory.

Wet earwax or dry? Lock-in by a single gene.

There are two earwax types — wet (brown and sticky) and dry (scaly) — and the wet allele is completely dominant over dry, so a single copy locks you in for wet. Almost all Africans and Europeans have the wet type; East Asians mostly have dry, with only 5–15% wet.

The same gene — ABCC11 — also drives axillary osmidrosis (AO), an underarm odor condition. In a 2009 genotyping study of 79 Japanese participants, an overwhelming 98.7% of people who reported AO carried the wet earwax genotype of ABCC11. That makes earwax type a remarkably reliable proxy for the condition.

Small study from two prefectures, so it's not the whole story — one participant had AO without the wet genotype, suggesting other factors can shape underarm-odor perception. Still, the genotype-phenotype overlap here is striking.

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Reference: A strong association of axillary osmidrosis with the wet earwax type determined by genotyping of the ABCC11 gene.

Can't smell asparagus p*e? You might have asparagus anosmia.

When asparagus is metabolized, it produces metabolites like methanethiol that give urine a distinctive smell. Even Benjamin Franklin wrote about it. But not everyone can detect that odor — "asparagus anosmia" means losing that particular smell perception.

A 2016 study by Markt et al. analyzed European participants and found that around 60% couldn't detect the odor — meaning detection is actually the rarer trait. The team identified 871 SNPs significantly tied to asparagus anosmia. One region on chromosome 1 stood out as the strongest association — and it contains members of the olfactory receptor 2 (OR2) gene family, which sit at the front line of smell perception.

European descent only, so generalizability needs work. But a fun, very specific window into how our smell genes shape what we perceive.

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Reference: Sniffing out significant "P*e values": genome wide association study of asparagus anosmia.

Gluten sensitivity may track the HLA region.

Gluten is a protein in wheat and some cereals. Gluten sensitivity is core to Celiac disease (an autoimmune disorder that damages the digestive system), but you don't have to have Celiac to react badly to gluten.

Rubicz et al. (2014) ran a genome-wide association analysis in 1,367 Mexican Americans and identified loci in the HLA (human leukocyte antigen) region significantly associated with anti-gliadin antibody production. Gliadin is a component of gluten, and these antibodies trigger an immune response against it. The team also found that a gene locus previously linked to Celiac disease was tied to anti-gliadin antibody levels in this cohort — suggesting the genetic factors that drive antibody production are central to understanding both gluten sensitivity and Celiac.

The study didn't pair antibody levels with actual dietary gluten intake — that next step is still open.

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Reference: Genome-wide genetic and transcriptomic investigation of variation in antibody response to dietary antigens.

Hay fever may track the HLA region.

Allergic rhinitis — sneezing, watery itchy eyes after pollen exposure — is closely tied to grass sensitization, which is an overreaction of the immune system to grass and pollen exposure. Ramasamy et al. (2011) looked at this in white adults from four European cohorts and ran a GWAS across more than 2 million gene loci.

Three loci hit statistical significance for either allergic rhinitis or grass sensitization. The strongest was a locus in the HLA (human leukocyte antigen) region — significantly tied to grass sensitization and consistent across all four cohorts. The link to allergic rhinitis itself was weaker, suggesting the HLA variants sensitize the immune system to pollen but other factors push that sensitivity into actual symptoms.

Allergic rhinitis was self-reported (not clinically diagnosed) — but this is the first large genome-wide look at the disease.

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Reference: A genome-wide meta-analysis of genetic variants associated with allergic rhinitis and grass sensitization and their interaction with birth order.

Your gut bacteria have genes behind them — yours.

The gut microbiome shifts with diet, lifestyle, and genetics. Researchers in a large Colombian study looked at 20 variants across 12 innate-immunity genes and how they relate to cardiometabolic syndrome and gut microbes.

Ten variants across 8 genes were significantly tied to gut microbe profiles. Most associations sat with NOD1 and NOD2 — nucleotide-binding oligomerization genes already known to influence Crohn's disease susceptibility. Carrying rs2066842 in NOD2 was tied to higher HDL ("good" cholesterol) and more abundance of beneficial bacteria like Coprococcus and Oscillospira. rs2075820 in NOD1 was also tied to Coprococcus, but additionally to Blautia and Lachnospiraceae species often found in people with metabolic disorders.

Innate-immunity genes, gut microbes, and cardiometabolic health all interlock here.

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Reference: Variants in genes of innate immunity, appetite control and energy metabolism are associated with host cardiometabolic health and gut microbiota composition.

Cravings for unhealthy food may track a dopamine gene.

The reward pathway in your brain is mediated by dopamine — and the dopamine receptor 2/ankyrin repeat domain and content kinase 1 (DRD2/ANKK1) gene has been previously tied to addictions ranging from gambling to drug abuse. Food intake runs on the same pathway.

A 2018 study of 276 Mexicans found that people with the A1A1+A1A2 genotype at the DRD2/ANKK1 TaqIA locus consumed more food categorized as unhealthy — fried dishes, sugars — than people with the A2A2 genotype. The same high-risk genotype was also tied to lower consumption of healthy foods like legumes.

Fascinatingly, the high-risk variant is rare in Caucasians (under 3%) but very common in Native Mexicans (67%). And almost 75% of Mexico's population is overweight or obese — making this a particularly relevant cohort for diet-related disease.

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Reference: DRD2/ANKK1 TaqI A1 polymorphism associates with overconsumption of unhealthy foods and biochemical abnormalities in a Mexican population.