What was sequenced
Francesco Calì, Antonino Musumeci, Mirella Vinci and seven colleagues at the IRCCS Oasi Research Institute in Troina, Italy, with the Kore University of Enna, report a descriptive case series in the International Journal of Molecular Sciences (volume 27, issue 20, article 9357, 21 October 2026; DOI 10.3390/ijms27209357; PubMed 42942128; open access full text). Between January 2024 and July 2026 they recruited ten patients who have tooth agenesis, hypodontia or oligodontia with third molars excluded, together with a neurodevelopmental or neurodegenerative condition: autism spectrum disorder, intellectual disability, language impairment, behavioral abnormalities, or Down syndrome. The cohort is eight males and two females, ages 5 to 50 years (mean 22). Nine patients have hypodontia, one to five missing permanent teeth; one has oligodontia, seven missing teeth (FDI 14, 15, 22, 25, 34, 35, 42). The authors are explicit that this is a clinically selected cohort from a center for rare neurodevelopmental disorders and is not representative of isolated tooth agenesis. Exomes were captured with Agilent SureSelect Human All Exon V7 and sequenced on an Illumina HiSeq 3000 with at least 20x coverage over 97 percent of target regions, aligned to the GRCh38 reference; trio-based sequencing was possible for three of the ten patients.
What they found
Thirty prioritized variants across 28 genes survived filtering by population frequency (minor allele frequency below 1 percent), predicted functional impact, inheritance pattern, and phenotype fit, plus four secondary findings in SLC22A5, GJB2, PKP2, and LPA that were set aside as carrier or cardiovascular findings. Of the 28 genes, only FGFR1 and GLI3 had previously been directly associated with human tooth agenesis or susceptibility to it. In the authors’ own ranking, the main observations are these. Two unrelated girls with intellectual disability and hypodontia carried distinct heterozygous loss-of-function variants in BCL11B (c.2272del, p.Asp758Thrfs54; c.2132G>A, p.Trp711Ter), consistent with dental defects already reported in BCL11B-related disorders. An eight-year-old boy with autism and global developmental delay carried a homozygous GLI3 p.Gly727Arg variant inherited from two heterozygous parents, a substitution already classified as benign in ClinVar for postaxial polydactyly. A 15-year-old boy with hypodontia carried a likely pathogenic NIPBL splice-site variant (c.7861-2A>G), while his similarly affected father carried a novel FGFR1 p.Asn185His variant that the son did not inherit, so neither variant alone explains the family pattern. And the one oligodontia patient, a 50-year-old man with Down syndrome, carried a heterozygous BBS1 p.Met390Arg allele plus variants of uncertain significance in PTH1R and STAT3, genes whose established dental phenotypes are eruption failures rather than missing tooth germs, with Down syndrome itself an alternative explanation for his teeth.
What it does not show
The paper’s own conclusion is that no identified variant is an established cause of the dental phenotype. The cohort is ten patients, selected for neurological disease, with no functional follow-up: splice-region predictions for four variants and nonsense-mediated-decay escape predictions for the BCL11B and GPR101 frameshift alleles are computational only, and the authors state they were not validated at the RNA level. The functional-annotation analysis is descriptive by design, and the authors warn it is not independent evidence because the gene set was preselected for dental and craniofacial plausibility. This is a case series, not a gene-discovery study with the power to establish one.
Where it sits in the field
For the third-teeth record, the piece worth keeping is the discipline, not a discovery. Tooth-agenesis genetics is the background against which the congenital-anodontia indication of the anti-USAG-1 program sits, and the established agenesis genes catalogued in this paper (WNT10A, WNT10B, PAX9, MSX1, AXIN2, LRP6, EDA, EDAR, EDARADD) still carry almost all of the confirmed burden: this cohort resolved none of them, and USAG-1 (SOSTDC1) is not among the findings. BCL11B is the one gene the series usefully sharpens, a syndromic disorder whose dental phenotype, hypodontia through oligodontia plus microdontia and enamel defects, is real but incompletely characterized and worth systematic dental screening in known BCL11B cohorts. No program tier moves; the field assessment at /field/ stands.
Where we differ from the coverage
We found no press coverage of this paper to differ from. Against the abstract’s neutral list of named genes, we would restate the finding in the direction the data point: the interesting result is a negative space. Ten exomes from patients selected for both missing teeth and neurodevelopmental disease produced exactly two genes (FGFR1, GLI3) with a prior direct tooth-agenesis link, one plausible syndromic addition (BCL11B), and zero variants the authors will call causal for the dental phenotype. That is a useful calibration of how much of agenesis genetics remains unexplained.
Provenance: grounded in the open-access full text at PubMed Central (PMC13704949), retrieved 2026-10-31, with authors, journal volume and issue, publication date, and abstract cross-checked against Europe PMC and Crossref; every number above (10 patients, 8 males and 2 females, ages 5 to 50, 9 hypodontia and 1 oligodontia with 7 missing teeth, 30 variants in 28 genes, 4 secondary findings, 20x coverage over 97 percent of target) was read directly from the article text. Method and sourcing standard at /method/.