Bidhan Chandra Krishi Viswavidyalaya

Bidhan Chandra Krishi Viswavidyalaya has published Tender for Supply Of Next-Generation Sequencing (Ngs) Services For Whole Genome Sequencing (Wgs) Of Plant S Les, Including Dna Extraction, 80 Gb (Q30) Data Per S Le, Bulked Segregant Analysis (Bsa-Seq), Pairwise Variant Discovery, Comparative Analysis, Polymorphism Detection, Gene Annotation, Candidate Region /Gene Identification And Linked-Marker Discovery With S Le Transport (Dry Ice) , Next-Generation Sequencing (Ngs) Services For Whole Genome Sequencing (Wgs) Of Plant Samples, Including Dna Extraction, 80 Gb (Q30) Data Per Sample, Bulked Segregant Analysis (Bsa-Seq), Pairwise Variant Discovery, Comparative Analysis, Polymorphism Detection, Gene Annotation, Candidate Region /Gene Identification And Linked-Marker Discovery With Sample Transport (Dry Ice). Detailed Specification Service Required: Reference-Based Whole Genome Sequencing (Wgs) Including Dna Extraction, High-Quality Sequencing, Variant Discovery, Gene Annotation, And Comparative Genomic Analysis. Sample Type:Young Leaf Samples (Fresh Plant Tissue). Sample Transport: Transport From Field To Servicing Laboratory In Dry Ice, Until Extraction Of High-Quality Dna Suitable For Wgs. Cost Must Be Included. Sequencing Platform: Illumina Novaseq 6000 Or Latest Equivalent High-Throughput Platform. Date: Minimum ≥80 Gb High-Quality Trimmed Data (Q30) Per Sample. Service And Analysis Requirement: 1. Dna Extraction, Qc And Bulk Preparation : • High-Quality Genomic Dna Extraction From Each Of The 60 Individual Leaf Samples And 2-4 Parents.Separate Qc Record For Each Of The 60 Dna Samples. Ormalisation Of Dna Concentration Followed By Equal-Quantity/Equimolar Pooling Of 15 Dnas Each Of Four Bulks. Documentation Of The Exact Contribution Of Each Individual Plant To Bulks; 2. Wgs Data Generation And Quality Control : •Trimmed And Quality-Filtered Paired-End Whole-Genome Sequencing Of 2-4 Bulks.Minimum ≥80 Gb Of High-Quality, Q30-Trimmed Data Per Bulk, Unless The Service Provider Proposes A Scientifically Justified Equivalent Coverage.Adapter Removal And Quality Filtering/Trimming.• Fastqc/Multiqc Or Equivalent Quality-Control Assessment. Raw-Read And Clean-Read Statistics, Q20/Q30, Gc Content, Read Count And Duplication Statistics.; 3. Reference-Based Genome Analysis : • Alignment Of Clean Reads To The Latest Appropriate Reference Genome. Reference Genome Accession/Version Must Be Reported. Reference-Based Mapping/Alignment Statistics.Total Reads Mapped And Percentage Mapped. Mapping Quality Statistics.Mean/Median Sequencing Depth.; • Genome-Wide Coverage And Percentage Of Genome Covered At Relevant Depth Thresholds. Coverage/Depth Plots For Both Bulk-1 And Bulk-2. Reference-Based Assembly And Mapping Statistics: Total Reads Mapped, Depth And Genome Coverage, Percentage Of Genome Covered, Mapping Quality Metrics.; 4. Variant Discovery / Polymorphism Detection : • High-Confidence Snp And Indel Calling, Say, Between Bulk-1 And Bulk-2. • Genomic Coordinates Of All Detected Variants. Reference And Alternative Alleles For Both The Parental Genotypes And Discarding Of Common Alternate Alleles Between The Two Parental Genotypes. • Read Depth, Genotype/Allele Information And Quality Score For Each Variant.A Variant Was Retained Only When The Sequencing Depth Of Both Parents Was At Least 20 Reads. • At Least 90% Of Parent-1 Reads Were Required To Support The Reference Allele And Similarly, At Least 90% Of Parent-2 Reads Were Required To Support The Alternative Allele. •A Stringent 90% Allele-Support Threshold Must Be Applied At Each Informative Marker.The 90% Threshold Must Be Applied Only To The Parental Samples, Not To The Bulks.; 5. Bulked Segregant Analysis (Bsa-Seq) Consider Both Snp And Indel Markers : When The Parent-1-Derived Allele Was The Reference Allele; • Snp-Index (Bulk1) = Parent-1 Derived Allele Reads In Bulk-1 / Total Bulk-1 Reads; Snp-Index(Bulk-2) = Parent-1-Derived Allele Reads In Bulk 2/ Total Bulk-2 Reads.; When The Parent-2-Derived Allele Was The Alternative Allele; Snp-Index (Bulk-1) = Parent-1 Derived Allele Reads In Bulk-1 / Total Bulk-1 Read; Snp-Index(Bulk-2) = Parent-1-Derived Allele Reads In Bulk 2/ Total Bulk-2 Reads.; Thus, The Calculated Index Always Represented The Proportion Of Reads Carrying The Allele Inherited From Parent-1, Rather Than Simply Representing The Frequency Of The Vcf Ref Or Alt Allele.; • Δsnp-Index (Snp-Index Bulk 1 − Snp-Index Bulk-2) Calculation Across The Genome.A Positive Δsnp-Index Therefore Indicated That The Parent-1-Derived Allele Was More Frequent In The Bulk-1 Than In The Bulk-2. Conversely, A Negative Δsnp-Index Indicated That The Parent-1-Derived Allele Was More Frequent In The Bulk-2. Identification Of Statistically/Significantly Differentiated Genomic Regions/Peaks. Sliding Window: A Window Size Of 0.1 Mb (1,000,00 Bp) And A Step Size Of 10 Kb (100,00 Bp) Must Be Used. ; Window Level-Qtl-Seq Stat: For Each Sliding Window, Mean Bulk-1Parent-1-Derived Allele Index = Sum Of Bulk-1 Parent-1-Derived Allele Indices / Number Of Informative Variants; Mean Bulk-2Parent-1-Derived Allele Index = Sum Of Bulk-2 Parent-1-Derived Allele Indices / Number Of Informative Variants. Mean Δsnp-Index = Sum Of Individual Δsnp-Index Values / Number Of Informative Variants. The Resulting Window-Level Dataset Therefore Summarized The Genomic Distribution Of Allele-Frequency Differences While Reducing The Influence Of Individual Marker-Level Fluctuations.; 6. Variant Annotation And Functional Impact• Annotation Of Snps And Indels Against The Reference Gene Annotation.• Classification Into Intergenic, Upstream/Downstream, Intronic, Exonic And Other Relevant Categories.• Synonymous, Missense, Nonsense/Stop-Gain, Splice-Site And Other Predicted Effects Where Applicable.• Functional Impact Prediction/Prioritization Of Variants.• Identification Of Variants Located Within Or Near Candidate Genes.; 7. Additional Deliverables • Summary Reports With All Statistical Outputs• Raw Data And Analysis Supporting Files Should Be Provided. ; • Fasta, Gff3, Vcf, Jpegand Bam Files For All The Samples As Applicable; • Detailed Compiled Report With Interpretations As Per The Instructions Of The Pi.. Last date of submission for this tender is 2026-10-01. This is a Nucleic Acid Extraction Kits tender in Nadia, West Bengal