DSPP

Summary: DSPP-derived proteins are structural components of the dentin extracellular matrix.

Reason: The matrix role is supported by the integrated evidence, while the cited 1997 study cloned mouse Dspp and used a partial human probe for chromosome mapping rather than assaying a full human protein. Native rat phosphophoryn biochemistry establishes calcium/collagen-associated mineral behavior, and mouse null versus DPP-truncation experiments distinguish later circumpulpal mineralization from initial mineral formation. This is a matrix contribution by processed products, not DSPP protease activity or proof that the uncleaved human precursor performs every measured role. Human family sequencing independently links heterozygous DSPP variants to dentinogenesis imperfecta and dentin dysplasia (PMID:18521831), establishing human disease relevance of the dentin contribution. This genetic evidence does not itself measure calcium/collagen binding or localize a human protein; those claims retain their separate experimental support.

Summary: The acidic DPP product binds calcium as part of its matrix mineralization role.

Reason: Retain the curated calcium-binding assertion. The accessible 1998 human sequence study describes the phosphophoryn context but its complete experimental body was not recovered; independently read rat phosphophoryn assays directly measure calcium binding. Native rat phosphophoryn and a shorter recombinant rat fragment both bind calcium, with different binding and mineral behavior. Their length and phosphorylation differ, so this comparison does not isolate phosphorylation or demonstrate identical activity for every human processed product.

Summary: The PAINT collagen-binding inference is grounded in a verified mammalian DSPP lineage and direct rat DPP measurements.

Reason: The literal GO:0005518 IBD is placed at PTN002936180, an ancestor of the sequence-matched human DSPP leaf in PTHR47819, and cites RGD:2525. The current rat donor has the experimental PMID:22615197 annotation: native rat incisor DPP was radiolabeled and its binding to collagen-coated substrates measured with substrate and cell-adhesion controls. This agrees with the independently read rat phosphophoryn biochemistry. No target-specific loss of the matrix-binding role is established; the one-donor placement is not a weakness by itself.

Summary: Collagen association is a supported molecular contribution of the DPP region.

Reason: The complete 1998 paper was not recovered, so no new collagen-binding assay is attributed to that human sequence study. The gene-level assertion is nevertheless supported by independently read native rat phosphophoryn and rat DPP adsorption experiments. These measure collagen association, not collagen synthesis or fibril assembly, and do not establish equivalent binding by the N-terminal DSP product.

Summary: The curated Reactome event places the processed DPP chain outside cells before receptor association.

Reason: The exact human event R-HSA-4086132 consumes the Q9NZW4-derived DPP entity R-HSA-4086140, residues 463–1301 in extracellular region, and integrin alphaVbeta1, producing a membrane-associated complex. The broader extracellular location retains the free ligand pool and is not exhausted by the separate matrix location. The supporting cellular study used mouse cells; the human chain coordinates are curated entity mapping, not proof that its experimental reagent was the current human chain.

Summary: Retain the positive, phylogenetically inferred nuclear pool as a non-core context.

Reason: The literal nuclear IBD at PTN002936180 is grounded in mouse and rat sources. Primary mouse tooth immunohistochemistry reports DPP in odontoblast nuclei with antibody controls, and rat RUB1 immunofluorescence independently reports a nuclear DPP pool. These positive observations and the verified human descent support retaining the contextual annotation; a secretion signal does not negate them. Non-core placement reflects the narrower cell and processed-product context relative to extracellular dentin function. The observations do not identify a specific nuclear mechanism, and disease-mutant retention in transfected cells is not used as evidence for a normal nuclear role.

Summary: The inferred cytoplasmic location retains a supported intracellular context.

Reason: The exact PTN002936180 cytoplasm IBD cites the human Q9NZW4 experimental source itself, a valid target-grounded PAINT placement rather than circularity. The human source documents DSPP immunohistochemistry in developing teeth, although its full localization panels were not recovered here. Rodent primary studies independently show intracellular DSPP-derived staining. These positive observations support the conserved, broad intracellular context and its non-core disposition; they do not resolve soluble cytosol or a particular processed product. Disease-mutant retention is a separate pathological observation and is not needed to justify retaining this normal intracellular pool.

Summary: Retain the curated human cytoplasmic localization in developing teeth.

Reason: The authentic abstract describes human dental tissues, RT-PCR and protein immunohistochemistry, including transient presecretory ameloblast and persistent odontoblast expression. The exact intracellular panel was not recovered, so its detailed antibody and subcompartment resolution are not claimed. Curator deference plus independent intracellular rodent observations support retaining the location as a contextual pool. Statements about osteocalcin or osteonectin in the same abstract are not transferred to DSPP. The raw cell-type extension remains preserved separately from the normal exporter representation.

Summary: Processed DSPP products act in the extracellular dentin matrix.

Reason: Retain the matrix location using the historical precursor study together with direct phosphophoryn matrix biochemistry and mouse tissue localization/physiology. The 1997 mouse clone and partial human mapping probe are distinguished from a human functional assay. The positive matrix pool does not negate the separately retained intracellular pools.

Summary: Retain the conserved odontoblast differentiation context with its source-specific developmental limits.

Reason: The exact IBD at PTN002936180 cites mouse and rat donors. The rat PMID:15763925 experiment primarily follows DSPP as a late differentiation marker, whereas mouse Dspp-null work provides independent perturbation evidence for altered odontoblast-lineage behavior and chondrocyte-like pulp cells. The latter supports the curated developmental association without identifying a direct nuclear mechanism or making DSPP indispensable for initial odontoblast formation. This context is retained alongside the better-resolved extracellular matrix function.

Summary: The inferred dentinogenesis role is supported by conserved matrix participation and donor physiology.

Reason: The exact dentinogenesis IBD at PTN002936180 cites mouse and rat sources. DSPP-derived matrix components contribute material and calcium/collagen-associated mineral behavior, so their role is more than being a substrate of another enzyme. Mouse genetic evidence supports formation and mineral maturation of circumpulpal dentin, while initial matrix-vesicle mineralization persists in the tested null setting. Retain the broader dentin-formation process without claiming obligatory initial nucleation or a human assay for each donor observation. Human family sequencing independently links heterozygous DSPP variants to dentinogenesis imperfecta and dentin dysplasia (PMID:18521831), establishing human disease relevance of the dentin contribution. This genetic evidence does not itself measure calcium/collagen binding or localize a human protein; those claims retain their separate experimental support.

Summary: DSPP-derived matrix proteins contribute to dentin formation.

Reason: The original reference establishes the precursor relationship largely through mouse cDNA and a partial human mapping probe. Independent biochemistry and mouse genetics support the gene-level dentinogenesis assertion: the products help establish the amount and uniformity of mineralized dentin. This does not mean that all dentin formation fails without DSPP or that the 1997 paper directly tested a current human full-length product. Human family sequencing independently links heterozygous DSPP variants to dentinogenesis imperfecta and dentin dysplasia (PMID:18521831), establishing human disease relevance of the dentin contribution. This genetic evidence does not itself measure calcium/collagen binding or localize a human protein; those claims retain their separate experimental support.

Summary: The human sequence-based dentinogenesis assertion is supported by independent functional evidence.

Reason: The available 1998 sequence evidence does not resolve every functional experiment in the complete paper. Retain the curator statement because independently read rat matrix assays and mouse stage-specific physiology directly support DSPP-derived contributions to dentin formation. The later mineralization role is compatible with initial mineral formation persisting in the tested mouse nulls. Human family sequencing independently links heterozygous DSPP variants to dentinogenesis imperfecta and dentin dysplasia (PMID:18521831), establishing human disease relevance of the dentin contribution. This genetic evidence does not itself measure calcium/collagen binding or localize a human protein; those claims retain their separate experimental support.

Summary: DSPP-derived proteins are non-collagenous components of the interstitial dentin matrix.

Reason: The MatrisomeDB paper describes the ECM classification and integrated proteomic resource; no DSPP-specific mass-spectrometry measurement is inferred from its aggregate coverage percentages. The curated class is independently consistent with the non-collagenous DSP/DPP matrix products, rat collagen-associated DPP experiments and mouse dentin localization/physiology. GO:0140149 is a cellular-component class, not an additional molecular activity.

Summary: Retain regulation of odontoblast differentiation as a contextual gene-level role while separating the unresolved original source attribution.

Reason: The current rat donor carries the cited annotation, but the accessible PMID:15308669 abstract and selected Methods concern C/EBPbeta/Nrf1 regulation of DSPP transcription; the complete paper was not recovered and this is not asserted to prove a DSPP protein feedback mechanism. Independent extracellular DPP experiments in mouse cells demonstrate integrin-dependent signaling and odontogenic marker/mineralization changes. Those findings support a bounded regulatory context without assigning transcription-factor activity or identifying the recombinant reagent as the current human product.