DSPP is a secreted precursor whose processed products contribute to the non-collagenous dentin matrix. The integrated matrix function includes DPP calcium/collagen interactions and dentin formation. The source and assay guide separates experimental species, processed products, original-paper access and repository cache availability.
The official Q9NZW4 record contains one displayed 1301-residue sequence and no alternative-products block. Signal peptide 1–15 is predicted; the annotated chains are 16–1301 (PRO_0000021120), DSP 16–462 (PRO_0000021121) and DPP 463–1301 (PRO_0000021122). These are processing annotations, not three splice isoforms. Cleavage by another enzyme does not confer protease activity on DSPP.
The historical 1997 precursor study combines a mouse full cDNA with a partial human mapping probe. The 1998 human sequence paper supplies human molar sequence context; its complete original was not recovered. Neither title alone establishes a modern full-length human functional assay. Rat phosphophoryn biochemistry in PMID:16046405(https://pubmed.ncbi.nlm.nih.gov/16046405/) directly supports calcium/collagen association and mineral behavior. Its native-versus-fragment comparison changes both length and phosphorylation, so neither variable is isolated.
The 2025 mouse study compares wild type, Dspp null and a DSP-containing allele with truncated DPP. Initial mineral formation persists in the tested mutants; later circumpulpal dentin quantity and uniformity are impaired. The allele is not a clean isolated DSP reagent or a human splice product. The proposed DSP calcium-retention mechanism remains a model. These findings qualify obligatory initiation claims while supporting the established matrix role.
Positive nuclear staining in mouse teeth and rat RUB1 cells supports a contextual location, not a demonstrated transcriptional activity. The human developing-tooth localization source PMID:11856645(https://pubmed.ncbi.nlm.nih.gov/11856645/) remains supported by its authentic abstract and curator judgment; its full intracellular panel was not recovered. Intracellular pools are retained without calling them soluble cytosol or assigning matrix mineralization to them. No subcellularLocation record was present in the inspected exact HPA target entry; that absence is not negative localization evidence.
The rat M2H4 study measures DSPP as a late differentiation marker. Independent mouse-null evidence supports a developmental context, with altered lineage behavior rather than a simple absence of initial odontoblast formation. The regulation ISS cites PMID:15308669(https://pubmed.ncbi.nlm.nih.gov/15308669/), whose inspected text concerns regulation of DSPP transcription; its exact protein-to-process attribution remains unresolved. Independent DPP cellular signaling supports the retained gene-level context. It does not retroactively validate an unseen assay in the earlier paper.
The PTHR47819 tree and alignment contain 27 nodes/sequences. Human PTN000789080 matches all 1301 official residues and descends from PTN002936180. Five literal IBDs cover collagen binding, nucleus, cytoplasm, odontoblast differentiation and dentinogenesis. Mouse MGI:MGI:109172/P97399 and rat RGD:2525/Q62598 evidence was traced separately. The cytoplasm IBD legitimately includes the human experimental source; this is not circularity. The positive ancestral placements are retained without substituting donor counts for phylogenetic evidence.
The exact Reactome reaction uses DPP residues 463–1301 outside cells before receptor association. This retains an extracellular pool beyond the matrix location. The human curated entity mapping is separate from the experimental reagent identity. MatrisomeDB classification supports the non-collagenous matrix class; its aggregate proteomic coverage was not treated as a DSPP-specific measurement.
All 15 imported source dictionaries and qualifiers are preserved: 10 annotations are accepted and 5 retained as non-core. No NEW annotation is proposed. The raw cytoplasmic IDA cell extension is retained in acquisition provenance even though normal tooling omits it from the normalized review. Existing caches and their metadata remain unchanged; separately recovered original sections do not upgrade a repository abstract cache.
The genuine Falcon research attempt failed authentication; its configured PerplexityLite fallback returned HTTP 401 with insufficient quota. No provider report was produced or fabricated. Manual research and independent original-paper consultation supplied the documented evidence. Five brief source excerpts appear once each in the review or core; these notes add no quotations.
Human DSPP disease is supported independently of the rodent binding experiments. In PMID:18521831(https://pmc.ncbi.nlm.nih.gov/articles/PMC5534847/), Methods (Kindreds and Genomic DNA; DSPP Mutation Analysis in Early Exons; Cloning and Sequencing of DSPP Repeat Domain) and Results (Patient Description and Mutational Analysis) describe families with autosomal dominant dentinogenesis imperfecta or dentin dysplasia, heterozygous variants, segregation in available relatives and control chromosomes. The paper treats the relationship between frameshift position and severity as a trend requiring more cases, not a universal rule. The reviewed human UniProt record distinguishes DGI1/DFNA39, DGI2, DGI3 and DTDP2; the newly examined family study supports the dentin-disease spectrum without independently re-establishing every subtype or the hearing phenotype. Genetic disease association supports human dentin biology, not a direct human calcium-binding, collagen-binding or localization assay.
PMID:22392858(https://pmc.ncbi.nlm.nih.gov/articles/PMC3390460/) provides a distinct mechanistic experiment. Methods (Expression Constructs; Cell culture and transfection; Quantitative ELISA; Immunocytochemistry) identify the first 31 human amino acids fused to mouse DSPP or GFP, additional engineered frameshift models and HEK293A host cells. Results and Figure 6 report reduced secretion of coexpressed normal DSPP when mutant constructs are added. This supports a dominant-negative trafficking model within the tested system. It is not an assay of the complete current natural human product, and calcium-mediated aggregation remains a mechanistic interpretation: the authors lacked sufficient purified material for the proposed calcium precipitation experiment. Mutant accumulation in membranes continuous with rough ER, including nuclear membrane in HEK293A, is distinct from the normal rodent nuclear DPP observations and does not establish a physiological human nuclear function.
Four functional-support links have been narrowed while retaining every imported original reference: PMID:8995371 is omitted from the structural-MF support list, PMID:9879917 from the calcium- and collagen-binding TAS support lists, and PMID:15308669 from the regulatory-process support list. The historical papers remain in the bibliography and original source fields. Their precursor/sequence/promoter context is not erased; direct matrix and cellular evidence remains cited for the retained actions. Failure to recover a complete paper is not evidence that it was miscited.
The positive nuclear and cytoplasmic observations and their PAINT placements remain non-core. Source qualifiers are preserved exactly. The applicable annotation-reviewer policy treats ordinary gene-product relationship qualifiers as inert for review reasoning; the decisions therefore rest on the literal lineage and positive localization evidence, not a reinterpretation of those strings. Neither a secretion signal nor pathological retention is used to negate the normal intracellular observations. No specific nuclear mechanism is inferred.
The reference assessments distinguish identity from claim support. VERIFIED for PMID:15308669 confirms the identified promoter paper and inspected findings; the original rat regulatory annotation remains UNRESOLVED and that paper is no longer functional support for the retained row. VERIFIED for PMID:36399478 confirms the identified resource and inspected Methods/Results, not a DSPP mass-spectrometry measurement. All 15 original source dictionaries and actions, the product boundary, integrated core and five existing excerpts remain unchanged. No new quotation or annotation is added.
Removed PMID:18521831 from the extracellular-matrix location support list and its accompanying location rationale. The human family study establishes disease association, not protein localization. Its disease and dentinogenesis support remains elsewhere in the review; annotation actions, source rows, product boundaries, core function and existing quotations are unchanged.