DeCure's autonomous Rare AI scientist is researching a drug-repurposing hypothesis for polydactyly of a triphalangeal thumb — screening already-approved drugs against its 5-gene Open Targets disease module to publish open-access research. Research is fast; the path to publication is funded in milestone stages.
Disease modulePolydactyly of a triphalangeal thumb maps to a 5-gene Open Targets module — the target space DeCure's AI scientist screens approved drugs against.
DeCure.ai methodSignature reversal (LINCS) plus network proximity (STRING) rank already-approved drugs likely to perturb this module — the same engine that produces DeCure.ai's repurposing hypotheses.
Repurposing thesisScreening approved medicines against this disease module, then publishing the evidence for the strongest candidate. Known pharmacology and human exposure data make the first question sharper — they do not establish safety or efficacy in a new indication.
Research record
01
ResearchComing soon
Candidate research + dossier — target rationale, drug-repurposing thesis and evidence pack.proof: Published dossier + on-chain hash
02
ValidationComing soon
In-vitro biological validation at a contract research org (CRO).proof: CRO contract + in-vitro report
03
Peer review & paperComing soon
Peer-reviewed paper published open-access (preprint + journal).proof: DOI + open-access link + on-chain hash
Current lead
No approved-drug candidate for polydactyly of a triphalangeal thumb is corroborated in the literature DeepSearch retrieved. Some conditions are managed with non-pharmacological care — a device, surgery or physical therapy — rather than a medicine; that may be the case here, or the literature we found may simply be too sparse yet to support a drug-repurposing angle.
Molecular view
patched 1 (PTCH1) — PTCH1 is one of the genes genetically linked to this disease in Open Targets — shown as context, not as a drug target we're pursuing: no approved-drug candidate for this disease is yet corroborated in the literature we found.
Loading structure…
helix sheet plmdrag to rotate · scroll to zoom
RCSB Protein Data Bank · entry 6E1H · 3.5 Å · ligand PALMITIC ACID (PLM). Experimental structure, not a prediction.
What the evidence adds up to
Triphalangeal thumb is a subtype of preaxial polydactyly in which the thumb has three phalanges instead of two. In four white Dutch families it showed variable expression, sometimes accompanied by preaxial extra rays, rudimentary postaxial polydactyly, cutaneous syndactyly of the hands, and rarely postaxial polydactyly and syndactyly of the feet. A separate analysis of four unrelated families found that thumb polydactyly could be part of the expression of a dominant gene often associated with absence of thenar intrinsic muscles and flexor pollicis longus, producing inability to flex the thumb across the palm (the Fromont anomaly). That gene’s expression ranged from thumb hypoplasia (most commonly the Fromont anomaly) to triphalangeal thumb or thumb polydactyly. Most cases of thumb polydactyly are sporadic and unilateral, but rare familial cases show wide variability and occasional nonpenetrance.
Surgical results for thumb duplication are frequently disappointing, and deformities from improperly executed reduction procedures often require further corrective surgery. Two specific techniques have been reported in individual cases. In a Wassel type VI duplication, an on-top plasty placed the distal part of the ulnar duplicate onto the proximal part of the radial duplicate; at 10 years the outcome was excellent cosmetically and functionally. In a Wassel type VII duplication with zigzag deformity, a side-to-side plasty joined both thumbs at the level of the proximal phalanx; at 3 years the outcome was considered acceptable cosmetically and excellent functionally. No similar cases with detailed long-term postoperative results were found in the literature.
No drug treatment is described in any of these abstracts. The condition is managed surgically, and the genetic basis is recognised but not yet linked to a specific molecular target. What is missing is a molecular genetic understanding that could explain the variable expression and nonpenetrance seen in families, and a prospective trial comparing surgical techniques with standardised long-term functional and cosmetic outcome measures. Without such a trial, the claim that on-top and side-to-side plasties obtain excellent results rests on two case reports only.
Evidence
Retrieved by DeepSearch across 234,678,978 indexed works and resolved on OpenAlex — ranked by citations, including the results that did not work.
Journal of Medical Genetics · 1994 · 33 citations · open access
Phenotypic analysis of triphalangeal thumb and associated hand malformations.
AbstractTriphalangeal thumb (TPT), a long, finger-like thumb with three phalanges instead of two, is regarded as a subtype of preaxial polydactyly. It can occur as a sporadic disorder, but is more often seen as a dominant familial trait. We describe four white Dutch families in which triphalangeal thumb has variable expression and is sometimes associated with preaxial extra rays, rudimentary postaxial polydactyly, cutaneous syndactyly of the hands, and, rarely, postaxial polydactyly and syndactyly of the feet. A comparison with similar familial conditions reported during the past 10 years is provided. The potential significance of linkage and molecular genetic analysis for better insight into the pathogenesis of complex hand malformations is discussed.
Thumb Polydactyly as a Part of the Range of Genetic Expression for Thenar Hypoplasia
AbstractAttempts to study the genetics of human thumb polydactyly have been hampered by lack of awareness of the extremely varied expression of upper limb preaxial anomalies. It has been appreciated that thumb polydactyly could range from a broadened distal phalanx to complete duplication of the entire thumb. Most cases are sporadic and unilateral, but rare familial cases with wide variability and occasional nonpenetrance have been described. Four unrelated families are described who have thumb polydactyly as part of the range of expression for a dominant gene that is frequently associated with absence of thenar intrinsic muscles and flexor pollicis longus with inability to flex the thumb across the palm (the Fromont anomaly). These families and previous literature reports suggest that expression of the gene can range from thumb hypoplasia (most commonly the Fromont anomaly) to triphalangeal thumb or thumb polydactyly. As a consequence of this experience, we urge that parents, siblings, and other close relatives of patients born with thumb polydactyly be carefully examined for mild degrees of thumb hypoplasia or any other thumb anomaly, and that these findings be considered when providing recurrence risk counseling.
AbstractWe present an unusual case of polydactyly of the thumb. The patient, despite having a fully developed nail bed, had a duplication at the metacarpophalangeal level consisting of a single bony phalanx. The Wassel classification of polydactyly, which is the most commonly cited classification scheme, does not include this particular anomaly. In addition, there has been no reference to this type of polydactyly in the literature.
International Journal of Surgery Case Reports · 2017 · 12 citations · open access
On-top and side-to-side plasties for thumb polydactyly
AbstractINTRODUCTION: "On-top" and "side-to-side" plasties are techniques used for treating thumb duplications in which one thumb is adequate proximally and the other thumb contains a better pulp and nail distally. The detailed functional results of these techniques have not been reported in the literature. We report on two cases. PRESENTATION OF CASES: The first case had Wassel type VI duplication. The ulnar duplicate had a functioning interphalangeal joint and the radial duplicate had a functioning carpometacarpal joint. "On-top" plasty was done by putting the distal part of the ulnar duplicate on top of the proximal part of the radial duplicate. At 10 years after surgery, the outcome was excellent both cosmetically and functionally. In the second case (Wassel type VII with a zigzag deformity), the radial duplicate had a hypoplastic distal phalanx with no nail. The ulnar duplicate had a functioning interphalangeal joint and the radial duplicate had a functioning carpometacarpal joint. "Side-to-side" plasty was done by joining both thumbs side-to-side at the level of the proximal phalanx. At 3 years after surgery, the outcome we considered acceptable cosmetically and excellent functionally. DISCUSSION: We could not find similar cases in the literature with detailed long-term postoperative results. CONCLUSION: "On-top" and "side-to-side" plasties in the management of specific cases of thumb polydactyly obtain excellent functional results with excellent or acceptable cosmetic outcome.
Thumb Duplication - Simple Surgery for a Common Problem?
AbstractPolydactyly is one of the most common congenital anomalies of the hand, and thumb duplication the most common manifestation of polydactyly. Despite this, the results of surgical treatment for thumb duplication are frequently disappointing, and deformities secondary to improperly executed reduction procedures often make further corrective surgery necessary. Examples of thumb duplication, their characteristic abnormal anatomy, and the complexity of surgical reduction procedures are illustrated.
Disease module: DeepOracle (Open Targets). Structures: RDKit from PubChem SMILES. Literature: retrieved by DeepSearch across 234,678,978 indexed works (targeted per-candidate search), resolved on OpenAlex.
DeCure is a research and publication project, not medical advice and not a treatment. "DeCure for X" describes a research goal, not a claim that a cure exists. Backing a cure is a contribution to fund the research — it is not an investment, and confers no yield, royalty, equity or IP ownership. Papers are published open-access by the DeCure.ai DAO.
