Did you know?
52 surprising, sourced facts about how disease and genetics differ for Indians. Every one links to the full story and comes as a card you can drop in a group chat.
Each fact is drawn from real data (1000 Genomes, PGS Catalog, gnomAD, WHO) and framed as population-level science, not medical advice.
Indian DNA is different
Where Indian genetics diverges from the populations medicine was built on.
A diabetes risk score built for Europeans flags 1 in 3 Telugu people as high-risk
PGS000033 was drawn to catch the top 10%, but crosses its high-risk line for 30.6% of Telugu Indians - a 3.1x over-call from ancestry, not biology.
Source: D2I2 PRS analysis (1000 Genomes phase 3)Read more →
A heart-disease gene score clears 99% of Sri Lankan Tamils - the group at higher true risk
The European coronary PRS flags just 0.7% of Sri Lankan Tamils (target 10%), under-warning a group with among the world's highest early heart-attack rates.
Source: D2I2 PRS analysis (1000 Genomes) / INTERHEARTRead more →
A prostate-cancer risk score over-flags nearly 1 in 3 Punjabi men
PGS000067 crosses its high-risk cut-off for 29.4% of Punjabis (Lahore) versus the 10% it was calibrated for - a 2.9x over-call.
Source: D2I2 PRS analysis (1000 Genomes phase 3)Read more →
A glaucoma risk score double-flags Sri Lankan Tamils
PGS000350 marks 20.2% of Sri Lankan Tamils as high-risk against a 10% design target - a 2x over-call from ancestry mis-calibration.
Source: D2I2 PRS analysis (1000 Genomes phase 3)Read more →
A breast-cancer polygenic score over-flags Bengali women by 70%
PGS000047 crosses its high-risk line for 17.3% of Bengalis, well above the 10% it was designed to catch.
Source: D2I2 PRS analysis (1000 Genomes phase 3)Read more →
A cholesterol risk score over-flags 1 in 6 Gujaratis
PGS000061 marks 16.4% of Gujaratis as high-risk versus the intended 10% - the ruler is set to European genetics, not Indian.
Source: D2I2 PRS analysis (1000 Genomes phase 3)Read more →
One statin side-effect risk variant is actually rarer in Indians than Europeans
The SLCO1B1 statin-myopathy allele is 16% in Europeans but ~4% in South Asians (just 2% in Gujaratis) - divergence doesn't always mean higher risk.
Source: 1000 Genomes phase 3
The G6PD gene variant the world tracks is absent in Indians - but the deficiency isn't
The African A- variant is 0% in 1000 Genomes South Asians; India's deficiency runs on its own variants - Orissa, Kalyan-Kerala, Mediterranean.
Source: 1000 Genomes phase 3 / D2I2 dossierRead more →
A diabetes 'body-clock' gene variant is far more common in Indians
The MTNR1B melatonin-receptor allele tied to fasting glucose is 43% in South Asians (46% in Punjabis) versus 29% in Europeans.
Source: 1000 Genomes phase 3Read more →
A type-2 diabetes risk allele is nearly universal in South Asians
The KCNQ1 diabetes variant reaches ~99-100% frequency across Indian groups versus 64% in East Asians - almost everyone here carries it.
Source: 1000 Genomes phase 3Read more →
The classic milk-tolerance gene is rare in South India - despite the dairy love
The European lactase-persistence allele is 51% in Europeans but just 5-6% in Telugu and Sri Lankan Tamil groups.
Source: 1000 Genomes phase 3Read more →
The 'Asian alcohol flush' gene is basically an East-Asian trait, not an Indian one
The ALDH2 flush allele is 17% in East Asians but 0% across every 1000 Genomes South Asian group tested.
Source: 1000 Genomes phase 3
The main genetic risk allele for Alzheimer's is markedly rarer in Indians
APOE-e4 is ~5% in Gujaratis and ~9% in South Asians overall, versus 16% in Europeans and 27% in Africans.
Source: 1000 Genomes phase 3Read more →
Whether your earwax is wet or dry is written in one gene - and it splits India
The 'dry earwax' ABCC11 allele is 55-56% in Telugu and Bengali groups but only 14% in Europeans.
Source: 1000 Genomes phase 3
A heart-failure DNA deletion in ~60 million South Asians is near-absent everywhere else
The MYBPC3 25bp deletion sits in 4-8% of South Asians and raises heritable cardiomyopathy odds about 7-fold; near-absent outside South/Southeast Asia.
Source: Dhandapany 2009, Nature GeneticsRead more →
Europe's standard Wilson's disease gene test barely works in India
The European flagship ATP7B mutation H1069Q is essentially absent here; one South-Indian study alone found 36 mutations, 13 never described before.
Source: Wilson's Disease: An Indian Perspective, PMC 2022Read more →
Western BRCA gene panels can miss the India-specific mutations behind hereditary breast cancer
About 30% of Indian hereditary breast/ovarian cancers carry a pathogenic BRCA1/2 variant, several recurrent ones specific to South Asians.
Source: Cancer Research Statistics & Treatment 2020Read more →
India's commonest deafness-gene mutation is the reverse of Europe's
In India the GJB2 variant W24X makes up ~72% of mutant alleles, while Europe's lead variant 35delG is only ~15% - a test tuned to Europe under-detects it.
Source: Int J Pediatr Otorhinolaryngol 2009Read more →
India's sickle-cell gene rides a haplotype that makes the disease milder than the textbook African form
The Arab-Indian haplotype raises fetal haemoglobin; India's mission has screened 42M+ people, finding 160,000+ with the disease and 1M+ carriers.
Source: PMC 2024 (National Sickle Cell Mission)Read more →
The same drug, a different body
Genes that change how a common medicine works — and differ in South Asians.
Clopidogrel, a top heart-attack drug, misfires far more often in South Asians
The CYP2C19 loss-of-function allele that blunts clopidogrel sits at 36% in South Asians and 41% in Sri Lankan Tamils, versus 15% in Europeans.
Source: 1000 Genomes phase 3Read more →
A gene that makes a common chemo drug toxic is ~35x more frequent in South Asians
The NUDT15 thiopurine-toxicity allele is ~7% in South Asians (8% in Punjabis) versus 0.2% in Europeans - which is why Asian dosing differs.
Source: 1000 Genomes phase 3
The genetics that set your warfarin dose look nothing like the European average in India
The VKORC1 dosing allele is 15% in South Asians versus 39% in Europeans and 88% in East Asians - one drug, three different 'right' doses.
Source: 1000 Genomes phase 3
Gujaratis carry a warfarin-sensitivity variant at nearly double the European rate
CYP2C9*3, which slows warfarin clearance, is 13% in Gujaratis versus 7% in Europeans - an over-dosing risk if dosed to a Western default.
Source: 1000 Genomes phase 3
After a transplant, many Indians need a higher tacrolimus dose than Western charts assume
The CYP3A5 non-expresser allele is 94% in Europeans but only 67% in South Asians, so far more Indians clear the immunosuppressant fast.
Source: 1000 Genomes phase 3
India's malaria cure can be dangerous for the ~1 in 50 who carry a hidden enzyme flaw
G6PD deficiency affects ~1.9% of Indians (up to 6% in some groups); primaquine, which clears relapsing malaria, can trigger red-cell breakdown in them.
Source: Blood Cells Mol Dis 2020Read more →
A gene that changes how codeine and many drugs work is far rarer in Indians than East Asians
The CYP2D6*10 reduced-metaboliser allele is 57% in East Asians but ~16% in South Asians - drug response splits sharply across Asia.
Source: 1000 Genomes phase 3
India's disease burden
The scale of conditions that hit India hardest.
94% of Indian Wilson's disease patients present before age 30 - and it's fully treatable
Parental consanguinity runs ~38% in Indian Wilson's patients versus ~4% in controls; caught early, copper chelation works; missed, it's fatal.
Source: Wilson's Disease: An Indian Perspective, PMC 2022Read more →
India sees 10,000+ babies born with thalassemia major every year - and it's preventable
About 3.7% of Indians are beta-thalassemia carriers (up to 6.5% in Punjab); carrier screening before conception prevents most cases.
Source: Colah et al. 2017Read more →
In parts of Assam, nearly 1 in 4 people carry a haemoglobin variant
HbE carrier rates reach ~24% in parts of Assam; the eastern Indian variant mix differs from the north, so screening must be regional.
Source: Colah et al. 2017Read more →
India carries the world's second-largest glaucoma burden - driven by a different gene
~12 million Indians have glaucoma and ~5 million are blind from it; CYP1B1, not the Western MYOC gene, dominates the genetics here.
Source: Mol Vis 2009 (Indian POAG/JOAG)Read more →
In parts of central India, about 1 in 86 babies is born with sickle cell disease
Concentrated in tribal communities, and where untreated, up to 20% of affected children die before their second birthday.
Source: Blood Cells Mol Dis 2024 (SCD registry)Read more →
India has over 100 million adults with diabetes - and they develop it younger and thinner
The 'thin-fat' South Asian phenotype means diabetes strikes at lower BMI with more hidden belly fat, so a Europe-tuned risk tool mis-triages the largest diabetes population on Earth.
Source: ICMR-INDIAB, Lancet Diab & Endo 2023Read more →
Myth vs fact
Common beliefs in India, calmly corrected.
A much-hyped 'folate gene' risk variant is actually less common in Indians
MTHFR C677T, heavily marketed in wellness testing, is 36% in Europeans but only 8-12% across South Asian groups.
Source: 1000 Genomes phase 3
You probably think leprosy is highly contagious. About 95% of people can never catch it.
It spreads only after long, close contact with an untreated person, and a patient becomes non-infectious within days of starting treatment.
Source: WHO / CDCRead more →
TB is not 'in the blood' - it's an airborne infection, curable in about 6 months
Families get TB from shared air, not shared genes; a full course of free government medicines cures most people.
Source: WHORead more →
Never force a spoon into a seizing person's mouth - no one can swallow their tongue
It can break teeth or block breathing; instead turn them on their side. About 7 in 10 people with epilepsy become seizure-free on medicine.
Source: WHO / NHSRead more →
When HIV treatment makes the virus undetectable, it cannot be passed to a partner
HIV doesn't spread through food, hugging, toilets or mosquito bites; daily ART, free in India, keeps people healthy - U=U.
Source: WHO / NHSRead more →
White skin patches (safed daag) are not leprosy and not contagious
Vitiligo is only a loss of pigment - normal sensation, no infection; no food combination such as fish-with-milk causes it.
Source: NHSRead more →
Asking someone directly about suicide lowers the risk - it doesn't plant the idea
Depression is a medical illness, not weakness or willpower; India's free, confidential helpline Tele-MANAS is 14416.
Source: WHO / NHSRead more →
The 'cysts' in PCOS usually aren't cysts - and most women with it can still conceive
PCOS affects roughly 1 in 8 to 1 in 10 women of reproductive age; the follicles rarely need surgery, and it's a treatable cause of infertility.
Source: WHO / NHSRead more →
Hepatitis C is curable in over 95% of people - and there is still no vaccine for it
An 8-to-12-week course of direct-acting antiviral tablets clears it; prevention relies on safe injections and screened blood.
Source: WHO / NHSRead more →
You can carry hepatitis B for years and feel perfectly fine
It spreads through blood and body fluids, not shared plates; a vaccine in India's childhood schedule prevents it and a blood test detects it.
Source: WHO / NHSRead more →
Sickle cell trait is not the disease - carriers are usually completely healthy
A child develops the disease only by inheriting the gene from both parents; two carriers face a 1-in-4 chance per pregnancy.
Source: NHS / CDCRead more →
A thalassaemia carrier is healthy - the only thing that matters is who they marry
Two carriers face a 1-in-4 chance of an affected child each pregnancy; a cheap blood test before marriage settles it.
Source: NHS / CDCRead more →
For people with G6PD deficiency, fava beans and mothballs really can trigger a crisis
Most carriers are healthy; problems come only from specific triggers - fava beans, naphthalene mothballs, certain antimalarials and infections.
Source: MedlinePlus (NIH)Read more →
Sweets alone don't cause type-2 diabetes - and it damages you silently for years
It develops from genetics, weight and inactivity; high blood sugar can stay symptomless while quietly harming eyes, kidneys, nerves and heart.
Source: WHO / NHSRead more →
Open questions
Things nobody has answered yet — the research frontier.
The Indians most likely to have G6PD deficiency are the ones global gene panels sampled least
India's malaria-endemic tribal belts carry both the most deficiency and India-specific variants, yet urban 1000 Genomes samples largely miss them.
Source: D2I2 dossier (tribal-sampling whitespace)Read more →
150 likely-damaging heart-gene variants seen in South Asians sit clinically unclassified
Across five cardiomyopathy genes, 150 AlphaMissense-'pathogenic' variants appear in South Asians - many absent in Europeans and still labelled 'uncertain'.
Source: D2I2 gnomAD x AlphaMissense scanRead more →
One heart gene alone holds 47 unresolved 'damaging' variants seen in South Asians
The D2I2 scan finds 47 South-Asian pathogenic missense variants in MYBPC3 - on top of its famous 25bp deletion.
Source: D2I2 gnomAD x AlphaMissense scanRead more →
One liver gene holds 75 damaging South-Asian variants no one has clinically resolved
ATP7B (Wilson's disease) carries the most South-Asian-observed AlphaMissense-'pathogenic' variants in the D2I2 scan - 75, many European-absent.
Source: D2I2 gnomAD x AlphaMissense scanRead more →
125 South-Asian variants in sudden-cardiac-death genes remain clinically unclassified
Across the KCNH2, KCNQ1 and SCN5A channelopathy genes, 125 AlphaMissense-'pathogenic' variants are seen in South Asians and still unresolved.
Source: D2I2 gnomAD x AlphaMissense scanRead more →
108 damaging variants in cancer-risk genes seen in South Asians still lack a clinical verdict
Across BRCA1, BRCA2, MLH1, MSH2 and TP53, the D2I2 scan finds 108 South-Asian AlphaMissense-'pathogenic' variants, many European-absent.
Source: D2I2 gnomAD x AlphaMissense scanRead more →