Seqanswers Leaderboard Ad

Collapse

Announcement

Collapse
No announcement yet.
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Originally posted by bssharma View Post
    Hi, I think i got my answer, thanks. If you can also tell me in Illumina sequencing which sequencing read length format generates overlapping end? and how long is the overlapping region for 230bp insert?
    Thank you so much
    I am sure you can do the calculation yourself.

    --
    Phillip

    Comment


    • Originally posted by pmiguel View Post
      I am sure you can do the calculation yourself.

      --
      Phillip
      According to my calculation there will not be any overlapping. Plz correct me if i am wrong.
      Thanks!

      Comment


      • Originally posted by bssharma View Post
        According to my calculation there will not be any overlapping. Plz correct me if i am wrong.
        Thanks!
        That would depend on the length of the reads.

        --
        Phillip

        Comment


        • Thanks for sharing!

          Comment


          • PCR primers sequences?

            Originally posted by protist View Post
            The original adapters (what I called legacy) released by Illumina are not exactly the same sequence as the currently in use TruSeq adapters - e.g. old adapters did not have indexes TruSeq ones do. The sequences for the individual TruSeq adapters can be found in the Illumina customer letter (see attached) which can also be downloaded from the Illumina website. I have also attached an alignment I had illustrating the differences between the original adapters and the currently in use TruSeq adapters.
            sorry,I am new.I want to know, in Truseq vs old adapters.pdf, which are PCR primers? Can you give the specific sequences? Thank you !

            Comment


            • Can any body has details of illumina miseq sequencing for 16S amplicon library construction specific to V3 region only . I need primer , adapter and barcode sequences used for V3 region 16S sequencing ..... Please help

              Comment


              • Hi everybody,
                do you know if it is possible to sequence in one run on MiSeq libraries from Nextera DNA and TruSeq PCR-Free together?

                Comment


                • Yes. They are perfect match if prepared by standard method. Both would have relatively similar peak size, so preferential clustering of smaller fragments will not be an issue and you can expect to get reads from both in proportion to input library.

                  Comment


                  • 2x300 MiSeq amplicon libraries barcoded primers

                    I'm new to MiSeq sequencing and to this blog and I'm having difficulties:

                    I'm sure these info are somewhere in the blog, but would someone be so kind and tell me where to find the primer design info for barcoded amplicon library for a 2x300 MiSeq run?
                    Are there any other info needed
                    Thanks in advance

                    Comment


                    • Skewer supports demultiplexing amplicon pairs

                      Originally posted by Sarutis View Post
                      I'm new to MiSeq sequencing and to this blog and I'm having difficulties:

                      I'm sure these info are somewhere in the blog, but would someone be so kind and tell me where to find the primer design info for barcoded amplicon library for a 2x300 MiSeq run?
                      Are there any other info needed
                      Thanks in advance
                      Recently we indexed 6 amplicon libraries and sequenced them in a 2 x 300bp MiSeq run. Each of these 6 amplicon libraries was also a mixed library which contains about 60 samples barcoded by different combination of forward-primer sequence and reverse-primer sequence (In fact, fragments from these samples were also ligated with 6 nucleotides index sequences). Hence we may demultiplex about 360 samples using this protocol.

                      In my understanding, the first level barcoding is easy to handle, you should note down the 6 bp index sequences when construct the libraries, and later you can specify the 6 bp sequences in the Sample Sheet when preparing a MiSeq run. For the second level barcoding, you need to know what gene region is amplified with what primers (forward and reverse).

                      For demultiplexing, I suggest you use skewer (http://sourceforge.net/projects/skewer/) which supports demultiplexing amplicon pairs.
                      Last edited by relipmoc; 09-29-2014, 09:31 AM. Reason: title

                      Comment


                      • Thanks, relipmoc
                        Since you were so kind to answer quickly, I'll ask few more things:
                        what do you use to connect overlapping paired sequences? I found PEAR and stitch as avaliable softwares, but I'd like an expert opinion

                        Comment


                        • I'm quite lost. I've got a set of paired end 100 nt HiSeq reads (library insert size was ~300bp) from a colleague and I can't determine what adapter sequences to trim. The current Illumina letter to customers lists a variety of sequences. Can someone explain the use of this set

                          Oligonucleotide sequences for Paired End DNA

                          PE Adapters
                          5' P-GATCGGAAGAGCGGTTCAGCAGGAATGCCGAG
                          5' ACACTCTTTCCCTACACGACGCTCTTCCGATCT
                          PE PCR Primer 1.0
                          5' AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACGCTCTTCCGATCT
                          PE PCR Primer 2.0
                          5' CAAGCAGAAGACGGCATACGAGATCGGTCTCGGCATTCCTGCTGAACCGCTCTTCCGATCT
                          PE Read 1 Sequencing Primer
                          5' ACACTCTTTCCCTACACGACGCTCTTCCGATCT
                          PE Read 2 Sequencing Primer
                          5' CGGTCTCGGCATTCCTGCTGAACCGCTCTTCCGATCT
                          versus this set?
                          Oligonucleotide sequences for the Multiplexing Sample Prep Oligo Only Kit
                          Multiplexing Adapters
                          5' P-GATCGGAAGAGCACACGTCT
                          5' ACACTCTTTCCCTACACGACGCTCTTCCGATCT
                          Multiplexing PCR Primer 1.0
                          5' AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACGCTCTTCCGATCT
                          Multiplexing PCR Primer 2.0
                          5' GTGACTGGAGTTCAGACGTGTGCTCTTCCGATCT
                          Multiplexing Read 1 Sequencing Primer
                          5' ACACTCTTTCCCTACACGACGCTCTTCCGATCT
                          Multiplexing Index Read Sequencing Primer
                          5' GATCGGAAGAGCACACGTCTGAACTCCAGTCAC
                          Multiplexing Read 2 Sequencing Primer
                          5' GTGACTGGAGTTCAGACGTGTGCTCTTCCGATCT
                          PCR Primer, Index 1
                          5’ CAAGCAGAAGACGGCATACGAGATCGTGATGTGACTGGAGTTC
                          PCR Primer, Index 2
                          5’ CAAGCAGAAGACGGCATACGAGATACATCGGTGACTGGAGTTC
                          .
                          .
                          .etc for 12 indexes total..

                          For a paired end set that includes indices (barcodes) which set would have been used?


                          Also, what are the 2 sequences of the oligos that coat a paired end flowcell used in the current HiSeq platform? (these would be sequences complementary to adapters sequences)
                          Last edited by ssully; 11-17-2014, 07:22 PM.

                          Comment


                          • Illumina helped sort me out. The seqs I posted last time are from an old , discontinued version of the kit (pp 20-21 of the July 2014 letter). The newer TruSeq adapters('universal' and 'indexed') are found on pp 12-13 of the letter .

                            These 'floppy end' adapters dimerize only at their last 12 nt. After they're ligated to flanks of the insert DNA fragment the result looks like this:
                            Code:
                            universal                                                                                                                indexed
                            5'             AATGATACGGCGACCACCGAGATCTACACACACTCTTTCCCTACACGACGCTCTTCCGATCT---insert--AGATCGGAAGAGCACACGTCTGAACTCCAGTCACNNNNNNATCTCGTATGCCGTCTTCTGCTTG 3'
                                                                                            |||||||||||||||||||||||||||||||||||||                          
                            3'     GTTCGTCTTCTGCCGTATGCTCTNNNNNNAGCACTACACTGACCTCAAGTCTGCACACGAGAAGGCTAGA---insert--TCTAGCCTTCTCGCAGCACATCCCTTTCTCACATCTAGAGCCACCAGCGGCATAGTAA  5'
                            indexed                                                                                                                  universal
                            If there is a PCR enrichment step (which is omitted from the new PCR-free kits) the PCR primers are

                            P1: 5' AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTA
                            (i.e. the first 44 bases of the universal adapter)

                            P2: 5' CAAGCAGAAGACGGCATACGAGAT
                            (reverse complement of the last 24 bases of the indexed primer)

                            P2 primes first, and then the ssDNA from P2 priming/extension becomes the template for P1. So the PCR product is:

                            Code:
                            5'AATGATACGGCGACCACCGAGATCTACACACACTCTTTCCCTACACGACGCTCTTCCGATCT---insert-----AGATCGGAAGAGCACACGTCTGAACTCCAGTCACNNNNNNATCTCGTATGCCGTCTTCTGCTTG 3'
                            3'TTACTATGCCGCTGGTGGCTCTAGATGTGTGTGAGAAAGGGATGTGCTGCGAGAAGGCTAGA---insert-----TCTAGCCTTCTCGTGTGCAGACTTGAGGTCAGTGNNNNNNTAGAGCATACGGCAGAAGACGAAC 5'

                            The enriched PCR product can then be denatured and each strand hydbridized to the bound flowcell oligos for cluster generation and reading.
                            Last edited by ssully; 11-18-2014, 01:57 PM.

                            Comment


                            • Indexed PCR Primer Ordering

                              Hello, I'm new here so apologies if this question has been answered.

                              I'm following the Buckler Lab GBS protocol and only have access to 48 adapters for ApeKI. I'd like to multiplex these into one Illumina lane using indexed PCR primers. I found sequences for PCR primers from the ddRAD protocol(Peterson). Do I have to alter the sequence at all to match my ApeKI adapters? Do I have to request anything particular when ordering these primers from IDT? Or would it be better for me to just order the NEBNext Multiplex Oligos for Illumina Kit? (https://www.neb.com/products/e7335-n...-primers-set-1)

                              ApeKI Common Adapter:
                              5'-CWGAGATCGGAAGAGCGGTTCAGCAGGAATGCCGAG
                              5'-CTCGGCATTCCTGCTGAACCGCTCTTCCGATCT

                              ApeKI Barcoded Adapter:
                              5’-CWGxxxxAGATCGGAAGAGCGTCGTGTAGGGAAAGAGTGT
                              5’-ACACTCTTTCCCTACACGACGCTCTTCCGATCTyyyy

                              PCR primers I'm considering ordering:
                              PCR1: AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACG
                              PCR2_Idx_1_ATCACG: CAAGCAGAAGACGGCATACGAGATCGTGATGTGACTGGAGTTCAGACGTGTGC
                              PCR2_Idx_2_CGATGT: CAAGCAGAAGACGGCATACGAGATACATCGGTGACTGGAGTTCAGACGTGTGC
                              PCR2_Idx_3_TTAGGC: CAAGCAGAAGACGGCATACGAGATGCCTAAGTGACTGGAGTTCAGACGTGTGC
                              PCR2_Idx_4_TGACCA: CAAGCAGAAGACGGCATACGAGATTGGTCAGTGACTGGAGTTCAGACGTGTGC

                              Comment


                              • Originally posted by ssully View Post
                                Illumina helped sort me out. The seqs I posted last time are from an old , discontinued version of the kit (pp 20-21 of the July 2014 letter). The newer TruSeq adapters('universal' and 'indexed') are found on pp 12-13 of the letter .

                                These 'floppy end' adapters dimerize only at their last 12 nt. After they're ligated to flanks of the insert DNA fragment the result looks like this:
                                Code:
                                universal                                                                                                                indexed
                                5'             AATGATACGGCGACCACCGAGATCTACACACACTCTTTCCCTACACGACGCTCTTCCGATCT---insert--AGATCGGAAGAGCACACGTCTGAACTCCAGTCACNNNNNNATCTCGTATGCCGTCTTCTGCTTG 3'
                                                                                                |||||||||||||||||||||||||||||||||||||                          
                                3'     GTTCGTCTTCTGCCGTATGCTCTAGNNNNNNCACTACACTGACCTCAAGTCTGCACACGAGAAGGCTAGA---insert--TCTAGCCTTCTCGCAGCACATCCCTTTCTCACATCTAGAGCCACCAGCGGCATAGTAA  5'
                                indexed                                                                                                                  universal
                                I think your index in the 3' to 5' read was off for so I adjusted it. Based on the 07-14 Illumina Customer letter for TruSeq HT indexes, the dual index would look something like this?
                                Code:
                                5' AATGATACGGCGACCACCGAGATCTACAC[i5]ACACTCTTTCCCTACACGACGCTCTTCCGATC-T-insert-A-GATCGGAAGAGCACACGTCTGAACTCCAGTCAC[i7]ATCTCGTATGCCGTCTTCTGCTTG 3'
                                			      	                      |||||||||||||||||||||||||||||||||||
                                3'     GTTCGTCTTCTGCCGTATGCTCTA[i7]CACTGACCTCAAGTCTGCACACGAGAAGGCTAG-A-insert-T-CTAGCCTTCTCGCAGCACATCCCTTTCTCACA[i5]CACATCTAGAGCCACCAGCGGCATAGTAA 5'

                                Comment

                                Latest Articles

                                Collapse

                                • seqadmin
                                  Strategies for Sequencing Challenging Samples
                                  by seqadmin


                                  Despite advancements in sequencing platforms and related sample preparation technologies, certain sample types continue to present significant challenges that can compromise sequencing results. Pedro Echave, Senior Manager of the Global Business Segment at Revvity, explained that the success of a sequencing experiment ultimately depends on the amount and integrity of the nucleic acid template (RNA or DNA) obtained from a sample. “The better the quality of the nucleic acid isolated...
                                  03-22-2024, 06:39 AM
                                • seqadmin
                                  Techniques and Challenges in Conservation Genomics
                                  by seqadmin



                                  The field of conservation genomics centers on applying genomics technologies in support of conservation efforts and the preservation of biodiversity. This article features interviews with two researchers who showcase their innovative work and highlight the current state and future of conservation genomics.

                                  Avian Conservation
                                  Matthew DeSaix, a recent doctoral graduate from Kristen Ruegg’s lab at The University of Colorado, shared that most of his research...
                                  03-08-2024, 10:41 AM

                                ad_right_rmr

                                Collapse

                                News

                                Collapse

                                Topics Statistics Last Post
                                Started by seqadmin, Yesterday, 06:37 PM
                                0 responses
                                11 views
                                0 likes
                                Last Post seqadmin  
                                Started by seqadmin, Yesterday, 06:07 PM
                                0 responses
                                10 views
                                0 likes
                                Last Post seqadmin  
                                Started by seqadmin, 03-22-2024, 10:03 AM
                                0 responses
                                51 views
                                0 likes
                                Last Post seqadmin  
                                Started by seqadmin, 03-21-2024, 07:32 AM
                                0 responses
                                68 views
                                0 likes
                                Last Post seqadmin  
                                Working...
                                X