Abstract
Tinospora cordifolia is known for its medicinal properties owing to the presence of useful constituents such as terpenes, glycosides, steroids, alkaloids, and flavonoids belonging to secondary metabolism origin. However, there is little information available pertaining to critical genomic elements (ESTs, molecular markers) necessary for judicious exploitation of its germplasm. We employed 454 GS-FLX pyrosequencing of entire transcripts and altogether ∼25 K assembled transcripts or Expressed sequence tags (ESTs) were identified. As the interest in T. cordifolia is primarily due to its secondary metabolite constituents, the ESTs pertaining to terpenoids biosynthetic pathway were identified in the present study. Additionally, several ESTs were assigned to different transcription factor families. To validate our transcripts dataset, the novel EST-SSR markers were generated to assess the genetic diversity among germplasm of T. cordifolia. These EST-SSR markers were found to be polymorphic and the dendrogram based on dice similarity index revealed three distinct clustering of accessions. The present study demonstrates effectiveness in using both NEWBLER and MIRA sequence read assembler software for enriching transcript-dataset and thus enables better exploitation of EST resources for mining candidate genes and designing molecular markers.
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Acknowledgments
We are grateful to Dr Jonathan K. Stiles, Professor and Co-Director, UJMT Fogarty Global Health Fellows Program, Morehouse School of Medicine, Atlanta, GA 30310, USA for manuscript editing. Thanks are due to the Director, NBPGR, New Delhi, for providing the facilities to carry out this study. Financial support provided by the Indian Council of Agricultural Research, New Delhi, India is also gratefully acknowledged.
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Fig. S1
Filtered read length distribution of Tinospora cordifolia transcriptome shotgun sequences. (DOCX 288 kb)
Fig. S2
Length distribution of unassembled 67,296 reads/singletons. (DOCX 25 kb)
Fig. S3
Transcript length distribution (10,370) which had shown no BLAST hit with NCBI nr database. (DOCX 19 kb)
Fig. S4
Sequence similarity distribution in Tinospora cordifolia showing the transcript alignment length (the range of highest peak lies between 75-95 %). (DOCX 23 kb)
Fig. S5
Sequence similarity of Tinospora cordifolia transcriptome with other species. (DOCX 14 kb)
Fig. S6
EC distributions of Tinospora cordifolia transcripts. (DOCX 12 kb)
Fig. S7
Distribution of the 15,036 contigs under gene ontology terms: biological processes, cellular components, molecular functions. (DOCX 559 kb)
Fig. S8
Transcription factor categorization in Tinospor acordifolia and its comparison with Arabidopsis thaliana, Malus domestica and Fragaria vesca. (DOCX 189 kb)
Table S1
List of Tinospora cordifolia accessions used for genetic diversity study. (DOCX 39 kb)
Table S2
Details of Tinospora cordifolia Transcriptome shotgun reads and their assembly into TSA using 454- Newbler and MIRA4.0 assembler. (DOCX 12 kb)
Table S3
Mapping result of High quality reads on Newbler assembled transcripts and final set of transcripts (Newbler + MIRA 4.2 assembled and merged). (DOCX 13 kb)
Table S4
List of gene products identified from transcript of Tinospora cordifolia involved in terpenoid-backbone biosynthesis. (XLSX 10 kb)
Table S5
List of EST-SSR primers used for characterization of Tinospora cordifolia accessions (DOCX 24 kb)
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Singh, R., Kumar, R., Mahato, A.K. et al. De novo transcriptome sequencing facilitates genomic resource generation in Tinospora cordifolia . Funct Integr Genomics 16, 581–591 (2016). https://doi.org/10.1007/s10142-016-0508-x
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DOI: https://doi.org/10.1007/s10142-016-0508-x