{"gene":"AMY1A","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":1981,"finding":"A single mouse alpha-amylase gene Amy-1a (AMY1A ortholog) generates two tissue-specific mRNAs (salivary gland and liver) that are identical except for their 5' non-translated sequences; the liver mRNA has a unique 161-nt leader specified by DNA 4.5 kb upstream of the common body, while the salivary gland mRNA has a 50-nt leader from sequences 7.5 kb upstream, demonstrating differential transcription and/or processing from the same gene locus.","method":"Genomic cloning, DNA sequencing, S1 nuclease mapping, Northern blot hybridization","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct sequencing of cloned genomic DNA with S1 mapping, replicated across multiple tissues, foundational mechanistic paper","pmids":["6162570"],"is_preprint":false},{"year":1981,"finding":"The Amy-1a gene uses alternative polyadenylation sites to produce two mRNA species differing in 3' non-translated region length in both liver and salivary gland; sequence analysis shows transcription can read through the major polyadenylation site, and flanking sequences downstream of each site share extensive homology implicated in polyadenylation or transcription termination.","method":"Genomic DNA sequencing, S1 nuclease mapping, Northern blot","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct genomic sequencing combined with S1 mapping, two orthogonal methods establishing alternative polyadenylation","pmids":["6166922"],"is_preprint":false},{"year":1983,"finding":"Two promoters of different strengths control Amy-1a transcription: a strong promoter active exclusively in the parotid gland (~30-fold stronger, drives parotid-specific leader mRNA) and a weaker promoter active in both parotid and liver (drives liver-type leader mRNA); neither promoter is used in tissues lacking cytoplasmic alpha-amylase mRNA (brain, kidney, spleen).","method":"Run-on transcription, S1 nuclease mapping, Northern blot, tissue fractionation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — nuclear run-on transcription plus S1 mapping across multiple tissues, multiple orthogonal methods","pmids":["6190572"],"is_preprint":false},{"year":1982,"finding":"Amy-1a is interrupted by 10 introns and the two tissue-specific mRNAs are generated by tissue-specific splicing events; regulation of Amy-1a expression occurs primarily at the transcriptional level, with a strong promoter exclusive to salivary gland and a weak promoter active in both salivary gland and liver.","method":"S1 nuclease mapping of nuclear transcripts, cDNA/genomic sequence comparison","journal":"Advances in experimental medicine and biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — S1 mapping of nuclear transcripts, single lab, consistent with companion papers but review-format presentation","pmids":["6186131"],"is_preprint":false},{"year":1985,"finding":"During postnatal mouse parotid gland differentiation, the two Amy-1a promoters are differentially activated in sequence: the weaker downstream promoter is first activated (active in virtually all acinar cells by 2 weeks), followed progressively by the strong parotid-specific promoter; once an acinar cell commits to expressing the strong-promoter transcript, this commitment is heritably passed to daughter cells.","method":"Run-on transcription, Northern blot, in situ hybridization","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — run-on transcription combined with in situ hybridization across developmental time points, multiple orthogonal methods","pmids":["3872721"],"is_preprint":false},{"year":1985,"finding":"Amy-1a and Amy-2a are closely linked on the same chromosome, with Amy-2a located ~23 kb downstream of Amy-1a within a contiguous 106-kb cloned segment; transcription termination of Amy-1a occurs within 3 kb downstream of the polyadenylation site in both parotid and liver.","method":"Genomic cloning, restriction mapping, Northern blot, run-on transcription","journal":"Journal of molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct cloning and physical mapping of 106-kb genomic segment with transcription termination mapping","pmids":["2989529"],"is_preprint":false},{"year":1985,"finding":"The weak Amy-1a promoter that directs liver-type leader mRNA synthesis is also active in the pancreas, making it active in all alpha-amylase-producing tissues (salivary gland, liver, and pancreas), while the strong parotid-specific promoter is exclusive to the parotid.","method":"In vitro elongation of nascent transcripts mapped to restriction fragments, Northern blot","journal":"Journal of molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — nascent transcript mapping, single lab, extends findings from the primary Amy-1a promoter papers","pmids":["3877171"],"is_preprint":false},{"year":1989,"finding":"The Amy-1a liver promoter, when fused to SV40 T antigen in transgenic mice, drives expression in adipose tissue (brown and white), revealing that the endogenous Amy-1a gene is expressed in adipose tissue—a previously unrecognized site of expression.","method":"Transgenic mouse generation, Southern blot, gene expression analysis of adipose tissue from non-transgenic mice","journal":"Science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — transgenic mouse experiment revealing endogenous expression site, single lab but direct experimental demonstration","pmids":["2785714"],"is_preprint":false},{"year":1994,"finding":"The N-linked carbohydrate chain on rice alpha-amylase Amy1A (AMY1A ortholog) is required for thermostability; its removal reduces thermostability and alters kinetic parameters (Vm and Km) for starch hydrolysis as well as substrate recognition.","method":"Site-directed mutagenesis to eliminate N-glycosylation site, in vitro enzyme kinetics assay, thermal stability assay","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of N-glycosylation site combined with in vitro kinetic and thermostability assays, multiple functional readouts","pmids":["7957256"],"is_preprint":false},{"year":1997,"finding":"Domain-swap experiments between rice Amy1A and Amy3D established that the Amy1A-type N-terminal domain confers high activity against soluble starch and contributes to protein stability, while the barrel structure (active site domain) predominantly determines oligosaccharide hydrolysis activity.","method":"Chimeric enzyme construction (Amy1A/3D and Amy3D/1A), in vitro enzyme activity assays with soluble starch and oligosaccharide substrates","journal":"Applied microbiology and biotechnology","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution of chimeric enzymes with domain-swap mutagenesis and in vitro functional characterization","pmids":["9163949"],"is_preprint":false},{"year":1979,"finding":"Variant Amy1A proteins (Amy1R1 and Amy1R2 alleles) differ from the normal Amy1A protein by enhanced deamidation of asparagine and/or glutamine residues, as determined by isoelectric focusing and electrophoretic analysis of purified protein products.","method":"Isoelectric focusing, electrophoresis of purified proteins, family segregation analysis","journal":"Human heredity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical characterization of purified protein variants, single lab","pmids":["468278"],"is_preprint":false}],"current_model":"AMY1A (and its mouse ortholog Amy-1a) encodes an alpha-amylase whose expression is controlled by two differentially regulated promoters producing tissue-specific mRNAs via alternative transcription initiation and splicing: a strong promoter exclusive to the parotid gland and a weaker promoter active in parotid, liver, and pancreas; the protein's N-linked glycosylation is required for thermostability and normal starch-hydrolysis kinetics, and its N-terminal domain governs soluble starch hydrolysis while the catalytic barrel domain governs oligosaccharide hydrolysis."},"narrative":{"mechanistic_narrative":"AMY1A encodes a secreted alpha-amylase that hydrolyzes starch and oligosaccharides, and its defining biological feature in this corpus is dual-promoter, tissue-specific transcriptional control of a single gene locus [PMID:6190572, PMID:6162570]. In the mouse ortholog Amy-1a, a strong promoter active exclusively in the parotid gland and a ~30-fold weaker promoter active across all alpha-amylase-producing tissues generate transcripts that differ only in their 5' leader sequences via alternative initiation and tissue-specific splicing, while alternative polyadenylation further diversifies the 3' ends [PMID:6190572, PMID:6162570, PMID:6166922, PMID:6186131]. During postnatal parotid differentiation these promoters activate in sequence—the weak downstream promoter first, then the strong parotid-specific promoter—and commitment to strong-promoter transcription is heritably propagated to daughter cells, with the weak promoter also driving expression in liver, pancreas, and adipose tissue [PMID:3872721, PMID:3877171, PMID:2785714]. At the protein level, an N-linked carbohydrate chain is required for thermostability and normal starch-hydrolysis kinetics [PMID:7957256], and domain-swap analysis assigns soluble-starch hydrolysis and protein stability to the N-terminal domain while the catalytic barrel domain governs oligosaccharide hydrolysis [PMID:9163949].","teleology":[{"year":1981,"claim":"Established that a single alpha-amylase gene, not separate genes, produces the distinct salivary and liver mRNAs, resolving how one locus yields tissue-specific transcripts.","evidence":"Genomic cloning, DNA sequencing, and S1 nuclease mapping of mouse Amy-1a across tissues","pmids":["6162570","6166922"],"confidence":"High","gaps":["Did not resolve whether the 5' leader difference arises from alternative initiation versus differential processing","No characterization of the encoded protein's enzymatic properties"]},{"year":1982,"claim":"Defined the gene architecture (10 introns) and located regulation primarily at the transcriptional level via tissue-specific splicing.","evidence":"S1 nuclease mapping of nuclear transcripts and cDNA/genomic sequence comparison","pmids":["6186131"],"confidence":"Medium","gaps":["Review-format presentation from a single lab","Splice-site usage not mapped at nucleotide resolution across all introns"]},{"year":1983,"claim":"Showed that two promoters of different strengths, not post-transcriptional events, drive the tissue-specific leader mRNAs, defining the core regulatory mechanism.","evidence":"Nuclear run-on transcription and S1 mapping across parotid, liver, and non-expressing tissues","pmids":["6190572"],"confidence":"High","gaps":["cis-elements and trans-acting factors conferring promoter strength not identified","Mechanism restricting the strong promoter to parotid unknown"]},{"year":1985,"claim":"Demonstrated developmental sequencing and heritable commitment of promoter usage during parotid differentiation, and mapped the locus physically relative to Amy-2a.","evidence":"Run-on transcription, in situ hybridization across developmental time points, and genomic cloning/restriction mapping of a 106-kb segment","pmids":["3872721","2989529","3877171"],"confidence":"High","gaps":["Molecular basis of heritable commitment (epigenetic marks) not determined","Transcription factors driving sequential promoter activation unidentified"]},{"year":1989,"claim":"Revealed adipose tissue as an unrecognized endogenous expression site through the activity of the weak liver promoter, broadening the tissue scope of the gene.","evidence":"Transgenic mice expressing the Amy-1a liver promoter fused to SV40 T antigen plus expression analysis of non-transgenic adipose tissue","pmids":["2785714"],"confidence":"Medium","gaps":["Functional role of amylase in adipose tissue not addressed","Single-lab transgenic readout"]},{"year":1994,"claim":"Established that N-linked glycosylation is functionally required, not merely decorative, for enzyme thermostability and kinetics.","evidence":"Site-directed mutagenesis of the N-glycosylation site with in vitro kinetic and thermostability assays (rice ortholog)","pmids":["7957256"],"confidence":"High","gaps":["Conducted on a plant ortholog; conservation of the requirement in mammalian AMY1A not tested in this corpus","Structural basis of glycan-dependent stabilization not resolved"]},{"year":1997,"claim":"Mapped distinct enzymatic functions to specific protein domains, separating soluble-starch from oligosaccharide hydrolysis.","evidence":"Construction of Amy1A/Amy3D chimeric enzymes and in vitro activity assays on soluble starch and oligosaccharide substrates (rice ortholog)","pmids":["9163949"],"confidence":"High","gaps":["Performed on plant orthologs","Atomic-level structural rationale for domain contributions not determined"]},{"year":null,"claim":"The transcription factors and cis-regulatory elements that confer parotid-exclusive strong-promoter activity and enforce heritable lineage commitment remain unidentified.","evidence":"","pmids":[],"confidence":"High","gaps":["No trans-acting factor isolated for either promoter","Epigenetic basis of heritable commitment uncharacterized","Physiological function of amylase expression in liver and adipose tissue undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[8,9]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[8,9]}],"localization":[],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[8,9]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,0]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P0DUB6","full_name":"Alpha-amylase 1A","aliases":["1,4-alpha-D-glucan glucanohydrolase 1","Salivary alpha-amylase"],"length_aa":511,"mass_kda":57.8,"function":"Calcium-binding enzyme that initiates starch digestion in the oral cavity (PubMed:12527308). Catalyzes the hydrolysis of internal (1->4)-alpha-D-glucosidic bonds, yielding a mixture of maltose, isomaltose, small amounts of glucose as well as small linear and branched oligosaccharides called dextrins (PubMed:12527308)","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P0DUB6/entry"},"depmap":{"release":"DepMap","has_data":false,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/AMY1A"},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/AMY1A","total_profiled":1310},"omim":[{"mim_id":"104702","title":"AMYLASE, SALIVARY, C; AMY1C","url":"https://www.omim.org/entry/104702"},{"mim_id":"104701","title":"AMYLASE, SALIVARY, B; AMY1B","url":"https://www.omim.org/entry/104701"},{"mim_id":"104700","title":"AMYLASE, SALIVARY, A; AMY1A","url":"https://www.omim.org/entry/104700"},{"mim_id":"104660","title":"AMYLASE, PANCREATIC, B; AMY2B","url":"https://www.omim.org/entry/104660"},{"mim_id":"104650","title":"AMYLASE, PANCREATIC, A; AMY2A","url":"https://www.omim.org/entry/104650"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Golgi apparatus","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"salivary gland","ntpm":7769.4}],"url":"https://www.proteinatlas.org/search/AMY1A"},"hgnc":{"alias_symbol":[],"prev_symbol":["AMY1"]},"alphafold":{"accession":"P0DUB6","domains":[{"cath_id":"3.20.20.80","chopping":"26-269_357-397","consensus_level":"high","plddt":98.6004,"start":26,"end":397},{"cath_id":"2.60.40.1180","chopping":"420-508","consensus_level":"medium","plddt":98.7388,"start":420,"end":508}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P0DUB6","model_url":"https://alphafold.ebi.ac.uk/files/AF-P0DUB6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P0DUB6-F1-predicted_aligned_error_v6.png","plddt_mean":96.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=AMY1A","jax_strain_url":"https://www.jax.org/strain/search?query=AMY1A"},"sequence":{"accession":"P0DUB6","fasta_url":"https://rest.uniprot.org/uniprotkb/P0DUB6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P0DUB6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P0DUB6"}},"corpus_meta":[{"pmid":"6190572","id":"PMC_6190572","title":"Two 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variation","url":"https://pubmed.ncbi.nlm.nih.gov/39313504","citation_count":3,"is_preprint":false},{"pmid":"32769329","id":"PMC_32769329","title":"Diagnostic utility of amylase α-1A, MOC 31, and CD 82 in renal oncocytoma versus chromophobe renal cell carcinoma.","date":"2020","source":"Indian journal of pathology & microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/32769329","citation_count":2,"is_preprint":false},{"pmid":"37707684","id":"PMC_37707684","title":"Plasma proteins as potential biomarkers of aging of single tissue and cell type.","date":"2023","source":"Biogerontology","url":"https://pubmed.ncbi.nlm.nih.gov/37707684","citation_count":2,"is_preprint":false},{"pmid":"38009164","id":"PMC_38009164","title":"Draft genome sequencing of halotolerant bacterium Salinicola sp. DM10 unravels plant growth-promoting potentials.","date":"2023","source":"3 Biotech","url":"https://pubmed.ncbi.nlm.nih.gov/38009164","citation_count":2,"is_preprint":false},{"pmid":"1451766","id":"PMC_1451766","title":"[Genetic profile of LIBP/1 inbred strain derived from the Kunming outbred stock of the mouse].","date":"1992","source":"Jikken dobutsu. Experimental animals","url":"https://pubmed.ncbi.nlm.nih.gov/1451766","citation_count":2,"is_preprint":false},{"pmid":"38730308","id":"PMC_38730308","title":"Large-scale transcriptomic and genomic analyses reveal a novel functional gene SERPINB6 for chicken carcass traits.","date":"2024","source":"Journal of animal science and biotechnology","url":"https://pubmed.ncbi.nlm.nih.gov/38730308","citation_count":1,"is_preprint":false},{"pmid":"42152161","id":"PMC_42152161","title":"Carbohydrate-dependent interaction between AMY1A/AMY2B copy number variation and APOA5 rs651821 associated with hypertriglyceridemia in Korean middle-aged adults.","date":"2026","source":"BMC nutrition","url":"https://pubmed.ncbi.nlm.nih.gov/42152161","citation_count":0,"is_preprint":false},{"pmid":"37216679","id":"PMC_37216679","title":"[From genotype to phenotype: amylase gene in childhood obesity].","date":"2023","source":"Revista medica del Instituto Mexicano del Seguro Social","url":"https://pubmed.ncbi.nlm.nih.gov/37216679","citation_count":0,"is_preprint":false},{"pmid":"41928242","id":"PMC_41928242","title":"​The inverse relationship between copy number variation burden and age of onset of metabolic syndrome in Korean middle-aged adults.","date":"2026","source":"BMC medical genomics","url":"https://pubmed.ncbi.nlm.nih.gov/41928242","citation_count":0,"is_preprint":false},{"pmid":"16152770","id":"PMC_16152770","title":"On the genetic polymorphism of the serum alpha-amylase in the population of the south western Bulgaria (second communication).","date":"2005","source":"Folia medica","url":"https://pubmed.ncbi.nlm.nih.gov/16152770","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":28559,"output_tokens":2456,"usd":0.061259,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9691,"output_tokens":2346,"usd":0.053553,"stage2_stop_reason":"end_turn"},"total_usd":0.114812,"stage1_batch_id":"msgbatch_0179Z2pxRYBsXi2xADneafRw","stage2_batch_id":"msgbatch_01LaY9ZaVdgjWArcZo9eqQE5","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1981,\n      \"finding\": \"A single mouse alpha-amylase gene Amy-1a (AMY1A ortholog) generates two tissue-specific mRNAs (salivary gland and liver) that are identical except for their 5' non-translated sequences; the liver mRNA has a unique 161-nt leader specified by DNA 4.5 kb upstream of the common body, while the salivary gland mRNA has a 50-nt leader from sequences 7.5 kb upstream, demonstrating differential transcription and/or processing from the same gene locus.\",\n      \"method\": \"Genomic cloning, DNA sequencing, S1 nuclease mapping, Northern blot hybridization\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct sequencing of cloned genomic DNA with S1 mapping, replicated across multiple tissues, foundational mechanistic paper\",\n      \"pmids\": [\"6162570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1981,\n      \"finding\": \"The Amy-1a gene uses alternative polyadenylation sites to produce two mRNA species differing in 3' non-translated region length in both liver and salivary gland; sequence analysis shows transcription can read through the major polyadenylation site, and flanking sequences downstream of each site share extensive homology implicated in polyadenylation or transcription termination.\",\n      \"method\": \"Genomic DNA sequencing, S1 nuclease mapping, Northern blot\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct genomic sequencing combined with S1 mapping, two orthogonal methods establishing alternative polyadenylation\",\n      \"pmids\": [\"6166922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1983,\n      \"finding\": \"Two promoters of different strengths control Amy-1a transcription: a strong promoter active exclusively in the parotid gland (~30-fold stronger, drives parotid-specific leader mRNA) and a weaker promoter active in both parotid and liver (drives liver-type leader mRNA); neither promoter is used in tissues lacking cytoplasmic alpha-amylase mRNA (brain, kidney, spleen).\",\n      \"method\": \"Run-on transcription, S1 nuclease mapping, Northern blot, tissue fractionation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — nuclear run-on transcription plus S1 mapping across multiple tissues, multiple orthogonal methods\",\n      \"pmids\": [\"6190572\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1982,\n      \"finding\": \"Amy-1a is interrupted by 10 introns and the two tissue-specific mRNAs are generated by tissue-specific splicing events; regulation of Amy-1a expression occurs primarily at the transcriptional level, with a strong promoter exclusive to salivary gland and a weak promoter active in both salivary gland and liver.\",\n      \"method\": \"S1 nuclease mapping of nuclear transcripts, cDNA/genomic sequence comparison\",\n      \"journal\": \"Advances in experimental medicine and biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — S1 mapping of nuclear transcripts, single lab, consistent with companion papers but review-format presentation\",\n      \"pmids\": [\"6186131\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"During postnatal mouse parotid gland differentiation, the two Amy-1a promoters are differentially activated in sequence: the weaker downstream promoter is first activated (active in virtually all acinar cells by 2 weeks), followed progressively by the strong parotid-specific promoter; once an acinar cell commits to expressing the strong-promoter transcript, this commitment is heritably passed to daughter cells.\",\n      \"method\": \"Run-on transcription, Northern blot, in situ hybridization\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — run-on transcription combined with in situ hybridization across developmental time points, multiple orthogonal methods\",\n      \"pmids\": [\"3872721\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"Amy-1a and Amy-2a are closely linked on the same chromosome, with Amy-2a located ~23 kb downstream of Amy-1a within a contiguous 106-kb cloned segment; transcription termination of Amy-1a occurs within 3 kb downstream of the polyadenylation site in both parotid and liver.\",\n      \"method\": \"Genomic cloning, restriction mapping, Northern blot, run-on transcription\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct cloning and physical mapping of 106-kb genomic segment with transcription termination mapping\",\n      \"pmids\": [\"2989529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1985,\n      \"finding\": \"The weak Amy-1a promoter that directs liver-type leader mRNA synthesis is also active in the pancreas, making it active in all alpha-amylase-producing tissues (salivary gland, liver, and pancreas), while the strong parotid-specific promoter is exclusive to the parotid.\",\n      \"method\": \"In vitro elongation of nascent transcripts mapped to restriction fragments, Northern blot\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — nascent transcript mapping, single lab, extends findings from the primary Amy-1a promoter papers\",\n      \"pmids\": [\"3877171\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1989,\n      \"finding\": \"The Amy-1a liver promoter, when fused to SV40 T antigen in transgenic mice, drives expression in adipose tissue (brown and white), revealing that the endogenous Amy-1a gene is expressed in adipose tissue—a previously unrecognized site of expression.\",\n      \"method\": \"Transgenic mouse generation, Southern blot, gene expression analysis of adipose tissue from non-transgenic mice\",\n      \"journal\": \"Science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic mouse experiment revealing endogenous expression site, single lab but direct experimental demonstration\",\n      \"pmids\": [\"2785714\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The N-linked carbohydrate chain on rice alpha-amylase Amy1A (AMY1A ortholog) is required for thermostability; its removal reduces thermostability and alters kinetic parameters (Vm and Km) for starch hydrolysis as well as substrate recognition.\",\n      \"method\": \"Site-directed mutagenesis to eliminate N-glycosylation site, in vitro enzyme kinetics assay, thermal stability assay\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of N-glycosylation site combined with in vitro kinetic and thermostability assays, multiple functional readouts\",\n      \"pmids\": [\"7957256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Domain-swap experiments between rice Amy1A and Amy3D established that the Amy1A-type N-terminal domain confers high activity against soluble starch and contributes to protein stability, while the barrel structure (active site domain) predominantly determines oligosaccharide hydrolysis activity.\",\n      \"method\": \"Chimeric enzyme construction (Amy1A/3D and Amy3D/1A), in vitro enzyme activity assays with soluble starch and oligosaccharide substrates\",\n      \"journal\": \"Applied microbiology and biotechnology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution of chimeric enzymes with domain-swap mutagenesis and in vitro functional characterization\",\n      \"pmids\": [\"9163949\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1979,\n      \"finding\": \"Variant Amy1A proteins (Amy1R1 and Amy1R2 alleles) differ from the normal Amy1A protein by enhanced deamidation of asparagine and/or glutamine residues, as determined by isoelectric focusing and electrophoretic analysis of purified protein products.\",\n      \"method\": \"Isoelectric focusing, electrophoresis of purified proteins, family segregation analysis\",\n      \"journal\": \"Human heredity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical characterization of purified protein variants, single lab\",\n      \"pmids\": [\"468278\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"AMY1A (and its mouse ortholog Amy-1a) encodes an alpha-amylase whose expression is controlled by two differentially regulated promoters producing tissue-specific mRNAs via alternative transcription initiation and splicing: a strong promoter exclusive to the parotid gland and a weaker promoter active in parotid, liver, and pancreas; the protein's N-linked glycosylation is required for thermostability and normal starch-hydrolysis kinetics, and its N-terminal domain governs soluble starch hydrolysis while the catalytic barrel domain governs oligosaccharide hydrolysis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"AMY1A encodes a secreted alpha-amylase that hydrolyzes starch and oligosaccharides, and its defining biological feature in this corpus is dual-promoter, tissue-specific transcriptional control of a single gene locus [#2, #0]. In the mouse ortholog Amy-1a, a strong promoter active exclusively in the parotid gland and a ~30-fold weaker promoter active across all alpha-amylase-producing tissues generate transcripts that differ only in their 5' leader sequences via alternative initiation and tissue-specific splicing, while alternative polyadenylation further diversifies the 3' ends [#2, #0, #1, #3]. During postnatal parotid differentiation these promoters activate in sequence\\u2014the weak downstream promoter first, then the strong parotid-specific promoter\\u2014and commitment to strong-promoter transcription is heritably propagated to daughter cells, with the weak promoter also driving expression in liver, pancreas, and adipose tissue [#4, #6, #7]. At the protein level, an N-linked carbohydrate chain is required for thermostability and normal starch-hydrolysis kinetics [#8], and domain-swap analysis assigns soluble-starch hydrolysis and protein stability to the N-terminal domain while the catalytic barrel domain governs oligosaccharide hydrolysis [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 1981,\n      \"claim\": \"Established that a single alpha-amylase gene, not separate genes, produces the distinct salivary and liver mRNAs, resolving how one locus yields tissue-specific transcripts.\",\n      \"evidence\": \"Genomic cloning, DNA sequencing, and S1 nuclease mapping of mouse Amy-1a across tissues\",\n      \"pmids\": [\"6162570\", \"6166922\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve whether the 5' leader difference arises from alternative initiation versus differential processing\", \"No characterization of the encoded protein's enzymatic properties\"]\n    },\n    {\n      \"year\": 1982,\n      \"claim\": \"Defined the gene architecture (10 introns) and located regulation primarily at the transcriptional level via tissue-specific splicing.\",\n      \"evidence\": \"S1 nuclease mapping of nuclear transcripts and cDNA/genomic sequence comparison\",\n      \"pmids\": [\"6186131\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Review-format presentation from a single lab\", \"Splice-site usage not mapped at nucleotide resolution across all introns\"]\n    },\n    {\n      \"year\": 1983,\n      \"claim\": \"Showed that two promoters of different strengths, not post-transcriptional events, drive the tissue-specific leader mRNAs, defining the core regulatory mechanism.\",\n      \"evidence\": \"Nuclear run-on transcription and S1 mapping across parotid, liver, and non-expressing tissues\",\n      \"pmids\": [\"6190572\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"cis-elements and trans-acting factors conferring promoter strength not identified\", \"Mechanism restricting the strong promoter to parotid unknown\"]\n    },\n    {\n      \"year\": 1985,\n      \"claim\": \"Demonstrated developmental sequencing and heritable commitment of promoter usage during parotid differentiation, and mapped the locus physically relative to Amy-2a.\",\n      \"evidence\": \"Run-on transcription, in situ hybridization across developmental time points, and genomic cloning/restriction mapping of a 106-kb segment\",\n      \"pmids\": [\"3872721\", \"2989529\", \"3877171\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of heritable commitment (epigenetic marks) not determined\", \"Transcription factors driving sequential promoter activation unidentified\"]\n    },\n    {\n      \"year\": 1989,\n      \"claim\": \"Revealed adipose tissue as an unrecognized endogenous expression site through the activity of the weak liver promoter, broadening the tissue scope of the gene.\",\n      \"evidence\": \"Transgenic mice expressing the Amy-1a liver promoter fused to SV40 T antigen plus expression analysis of non-transgenic adipose tissue\",\n      \"pmids\": [\"2785714\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of amylase in adipose tissue not addressed\", \"Single-lab transgenic readout\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Established that N-linked glycosylation is functionally required, not merely decorative, for enzyme thermostability and kinetics.\",\n      \"evidence\": \"Site-directed mutagenesis of the N-glycosylation site with in vitro kinetic and thermostability assays (rice ortholog)\",\n      \"pmids\": [\"7957256\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Conducted on a plant ortholog; conservation of the requirement in mammalian AMY1A not tested in this corpus\", \"Structural basis of glycan-dependent stabilization not resolved\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Mapped distinct enzymatic functions to specific protein domains, separating soluble-starch from oligosaccharide hydrolysis.\",\n      \"evidence\": \"Construction of Amy1A/Amy3D chimeric enzymes and in vitro activity assays on soluble starch and oligosaccharide substrates (rice ortholog)\",\n      \"pmids\": [\"9163949\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Performed on plant orthologs\", \"Atomic-level structural rationale for domain contributions not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The transcription factors and cis-regulatory elements that confer parotid-exclusive strong-promoter activity and enforce heritable lineage commitment remain unidentified.\",\n      \"evidence\": null,\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No trans-acting factor isolated for either promoter\", \"Epigenetic basis of heritable commitment uncharacterized\", \"Physiological function of amylase expression in liver and adipose tissue undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [8, 9]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [8, 9]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [8, 9]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":3,"faith_total":4,"faith_pct":75.0}}