Academic Journal

Haplotype-resolved autotetraploid genome of Dioscorea nipponica provides insights into recent polyploidization, metabolic rewiring, and environmental adaptation.

Λεπτομέρειες βιβλιογραφικής εγγραφής
Τίτλος: Haplotype-resolved autotetraploid genome of Dioscorea nipponica provides insights into recent polyploidization, metabolic rewiring, and environmental adaptation.
Συγγραφείς: Li SS; Jiangsu Provincial Key Laboratory for Plant Taxonomy, Resource Conservation and Utilization, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China., Sun XQ; Jiangsu Provincial Key Laboratory for Plant Taxonomy, Resource Conservation and Utilization, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China., Feng Y; Key Laboratory of Mountain Ecological Rehabilitation and Biological Resource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences (CAS), Chengdu, 610041, China., Hu K; Jiangsu Provincial Key Laboratory for Plant Taxonomy, Resource Conservation and Utilization, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China., Li P; College of Life Sciences, Zhejiang University, Hangzhou, 310058, China., Liu Y; Jiangsu Provincial Key Laboratory for Plant Taxonomy, Resource Conservation and Utilization, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China., Gu JH; Jiangsu Provincial Key Laboratory for Plant Taxonomy, Resource Conservation and Utilization, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China., Chen M; Jiangsu Provincial Key Laboratory for Plant Taxonomy, Resource Conservation and Utilization, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China., Lu RS; Jiangsu Provincial Key Laboratory for Plant Taxonomy, Resource Conservation and Utilization, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, 210014, China.
Πηγή: The Plant journal : for cell and molecular biology [Plant J] 2026 Sep; Vol. 127 (6), pp. e71153.
Τύπος έκδοσης: Journal Article
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Blackwell Scientific Publishers and BIOS Scientific Publishers in association with the Society for Experimental Biology Country of Publication: England NLM ID: 9207397 Publication Model: Print Cited Medium: Internet ISSN: 1365-313X (Electronic) Linking ISSN: 09607412 NLM ISO Abbreviation: Plant J Subsets: MEDLINE
Imprint Name(s): Original Publication: Oxford : Blackwell Scientific Publishers and BIOS Scientific Publishers in association with the Society for Experimental Biology, c1991-
Ιατρικοί όροι (MeSH): Dioscorea*/genetics , Dioscorea*/metabolism , Dioscorea*/physiology , Genome, Plant*/genetics, Haplotypes/genetics ; Adaptation, Physiological/genetics ; Tetraploidy ; Polyploidy
Περίληψη: Whole-genome duplication (WGD, or polyploidization) is a major evolutionary force in plants, yet the genomic, transcriptional, and metabolic consequences of autopolyploidy remain less understood than those of allopolyploidy. Dioscorea nipponica, a medicinal species producing diosgenin-type steroidal saponins, harbors both diploid and autopolyploid populations, providing a unique system to investigate these processes. Here, we present a haplotype-resolved, chromosome-scale genome assembly of autotetraploid D. nipponica (2n = 4x = 40). Comparative and population genomic analyses indicate a single, recent autotetraploid origin (<1.63 Ma), after the divergence of its diploid ancestors (~2.5-2.9 Ma), coinciding with Pliocene-Pleistocene climatic shifts that may have promoted population isolation and genome duplication. The four haplotypes exhibit high average nucleotide identity, extensive synteny and similar global gene expression, with pervasive allele loss (~32% of genes) and widespread allelic transcriptional suppression (~60% of expressed tetrads), together buffering dosage effects. Metabolomic profiling reveals a metabolic trade-off in rhizomes, with autotetraploids accumulating higher flavonoids but lower diosgenin-type steroidal saponins than diploids, potentially enhancing reproductive fitness and adaptation to marginal environments. This shift is supported by expanded flavonoid gene families (e.g., PAL, CHS), some exhibiting positive dosage effects, whereas diosgenin pathway genes (e.g., CYP90, CYP94) remain copy number stable and mostly show negative dosage effects in autotetraploids. Selective sweep analysis further identified genes linked to genome stability (e.g., AtTOP3α, AtDMC1) and abiotic stress response, crucial for polyploid establishment. Overall, these findings offer novel insights into how autopolyploidy shapes gene expression, metabolic evolution, and ecological adaptation, with implications for the conservation and utilization of this medicinally important species.
(© 2026 The Author(s). The Plant Journal published by Society for Experimental Biology and John Wiley & Sons Ltd.)
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Grant Information: 32570444 National Natural Science Foundation of China; 32671990 National Natural Science Foundation of China; 32200192 National Natural Science Foundation of China; JSPKLB202401 Open Fund of the Jiangsu Provincial Key Laboratory for Plant Taxonomy, Resource Conservation and Utilization; JSTJ-2025-004 Jiangsu Provincial Science and Technology Association Youth Talent Support Project
Contributed Indexing: Keywords: Dioscorea nipponica; autopolyploidy; haplotype‐resolved genome; metabolic trade‐off; population genomics
Entry Date(s): Date Created: 20260928 Date Completed: 20260928 Latest Revision: 20260930
Update Code: 20260930
PubMed Central ID: PMC13618807
DOI: 10.1111/tpj.71153
PMID: 42804372
Βάση Δεδομένων: MEDLINE
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  Data: Haplotype-resolved autotetraploid genome of Dioscorea nipponica provides insights into recent polyploidization, metabolic rewiring, and environmental adaptation.
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  Data: Whole-genome duplication (WGD, or polyploidization) is a major evolutionary force in plants, yet the genomic, transcriptional, and metabolic consequences of autopolyploidy remain less understood than those of allopolyploidy. Dioscorea nipponica, a medicinal species producing diosgenin-type steroidal saponins, harbors both diploid and autopolyploid populations, providing a unique system to investigate these processes. Here, we present a haplotype-resolved, chromosome-scale genome assembly of autotetraploid D. nipponica (2n = 4x = 40). Comparative and population genomic analyses indicate a single, recent autotetraploid origin (&amp;lt;1.63 Ma), after the divergence of its diploid ancestors (~2.5-2.9 Ma), coinciding with Pliocene-Pleistocene climatic shifts that may have promoted population isolation and genome duplication. The four haplotypes exhibit high average nucleotide identity, extensive synteny and similar global gene expression, with pervasive allele loss (~32% of genes) and widespread allelic transcriptional suppression (~60% of expressed tetrads), together buffering dosage effects. Metabolomic profiling reveals a metabolic trade-off in rhizomes, with autotetraploids accumulating higher flavonoids but lower diosgenin-type steroidal saponins than diploids, potentially enhancing reproductive fitness and adaptation to marginal environments. This shift is supported by expanded flavonoid gene families (e.g., PAL, CHS), some exhibiting positive dosage effects, whereas diosgenin pathway genes (e.g., CYP90, CYP94) remain copy number stable and mostly show negative dosage effects in autotetraploids. Selective sweep analysis further identified genes linked to genome stability (e.g., AtTOP3α, AtDMC1) and abiotic stress response, crucial for polyploid establishment. Overall, these findings offer novel insights into how autopolyploidy shapes gene expression, metabolic evolution, and ecological adaptation, with implications for the conservation and utilization of this medicinally important species.&lt;br /&gt; (&#169; 2026 The Author(s). The Plant Journal published by Society for Experimental Biology and John Wiley &amp; Sons Ltd.)
– Name: Ref
  Label: References
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– Name: GrantInfo
  Label: Grant Information
  Group: Grant
  Data: 32570444 National Natural Science Foundation of China; 32671990 National Natural Science Foundation of China; 32200192 National Natural Science Foundation of China; JSPKLB202401 Open Fund of the Jiangsu Provincial Key Laboratory for Plant Taxonomy, Resource Conservation and Utilization; JSTJ-2025-004 Jiangsu Provincial Science and Technology Association Youth Talent Support Project
– Name: SubjectMinor
  Label: Contributed Indexing
  Group:
  Data: &lt;i&gt;Keywords: &lt;/i&gt;Dioscorea nipponica; autopolyploidy; haplotype‐resolved genome; metabolic trade‐off; population genomics
– Name: DateEntry
  Label: Entry Date(s)
  Group: Date
  Data: &lt;i&gt;Date Created: &lt;/i&gt;20260928 &lt;i&gt;Date Completed: &lt;/i&gt;20260928 &lt;i&gt;Latest Revision: &lt;/i&gt;20260930
– Name: DateUpdate
  Label: Update Code
  Group: Date
  Data: 20260930
– Name: PubmedCentralID
  Label: PubMed Central ID
  Group: ID
  Data: PMC13618807
– Name: DOI
  Label: DOI
  Group: ID
  Data: 10.1111/tpj.71153
– Name: AN
  Label: PMID
  Group: ID
  Data: 42804372
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=cmedm&AN=42804372
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1111/tpj.71153
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        StartPage: e71153
    Subjects:
      – SubjectFull: Haplotypes genetics
        Type: general
      – SubjectFull: Adaptation, Physiological genetics
        Type: general
      – SubjectFull: Tetraploidy
        Type: general
      – SubjectFull: Polyploidy
        Type: general
      – SubjectFull: Dioscorea genetics
        Type: general
      – SubjectFull: Dioscorea metabolism
        Type: general
      – SubjectFull: Dioscorea physiology
        Type: general
      – SubjectFull: Genome, Plant genetics
        Type: general
    Titles:
      – TitleFull: Haplotype-resolved autotetraploid genome of Dioscorea nipponica provides insights into recent polyploidization, metabolic rewiring, and environmental adaptation.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Li SS
      – PersonEntity:
          Name:
            NameFull: Sun XQ
      – PersonEntity:
          Name:
            NameFull: Feng Y
      – PersonEntity:
          Name:
            NameFull: Hu K
      – PersonEntity:
          Name:
            NameFull: Li P
      – PersonEntity:
          Name:
            NameFull: Liu Y
      – PersonEntity:
          Name:
            NameFull: Gu JH
      – PersonEntity:
          Name:
            NameFull: Chen M
      – PersonEntity:
          Name:
            NameFull: Lu RS
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 09
              Text: 2026 Sep
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-electronic
              Value: 1365-313X
          Numbering:
            – Type: volume
              Value: 127
            – Type: issue
              Value: 6
          Titles:
            – TitleFull: The Plant journal : for cell and molecular biology
              Type: main
ResultId 1