One of the most common inflammatory diseases in the world, with an estimated heritability around 50%. Two studies behind this page found different genetic signals -- one from a large European meta-analysis, one specific to a localized form of the disease in an isolated Italian population.
Periodontitis is a common inflammatory disease of the tissues that support the teeth -- gums, ligament, and bone -- and if untreated, it can lead to tooth loss. Its severe forms affect an estimated 11% of people worldwide, and twin and family studies put its heritability around 50%, a genuinely substantial genetic component for a disease often thought of as purely a matter of oral hygiene.
The larger study behind this page combined genome-wide association data across 5,095 cases and 9,908 controls of North-West European background, covering both the widespread moderate form (chronic periodontitis) and the rarer, more severe early-onset form (aggressive periodontitis). Its own stated headline finding is two loci: one near the pseudogene MTND1P5, and one downstream of SHISA9 -- neither of which is the variant catalogued on this page. rs11084095, near SIGLEC5, is a further association this same study reports, genuinely part of its results, but not one of its two headline loci -- stated here plainly rather than implied otherwise.
A second study took a different approach entirely: a genome-wide search within an isolated Italian population, where reduced genetic diversity can make real associations easier to detect. It found four SNPs in EFCAB4B significantly associated specifically with localized chronic periodontitis (affecting a limited number of teeth, rather than generalized across the mouth) -- the best of them, rs242016, catalogued here.
Periodontitis is diagnosed by clinical dental examination -- measuring gum pocket depth, checking for bleeding and bone loss, sometimes with X-rays -- not by genotype. Management is professional cleaning (scaling and root planing), improved oral hygiene, and in more advanced cases, further periodontal treatment or surgery, managed by a dentist or periodontist.
Genetics is not an excuse to skip oral hygiene. An estimated 50% heritability means genetics matters, but the other half -- plaque control, smoking status, and regular dental care -- remains squarely within a person's own control and is what actually prevents and treats this disease day to day.
What a 23andMe/AncestryDNA export or raw VCF can and can't tell you about Periodontitis comes down to these specific, well-studied positions — not a diagnosis.
Databases, guidelines and references
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Periodontitis. MyGeneLog™. https://www.mygenelog.com/conditions/periodontitis
No. The study that reports it actually headlines two different loci, near MTND1P5 and SHISA9, as its main finding. SIGLEC5 is a further association the same study reports, genuinely part of its results but not its two headline loci.
It means genetics is a real, substantial contributor -- but the other half of the picture is environmental and behavioral (plaque control, smoking, diabetes), and that half remains squarely modifiable through oral hygiene and dental care.
Professional cleaning (scaling and root planing), improved oral hygiene, and for more advanced cases, further periodontal treatment or surgery -- managed by a dentist or periodontist, not determined by genotype.
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