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Genome Representation and
  Variant Identification

       Deanna M. Church




    ISCA Consortium Conference
From Green ED et al. Nature 2011
CEPH:
 A=1.000
 G=0
http://www.ncbi.nlm.nih.gov/variation/tools/1000genomes
Multiple                Suspect
submissions
                     1000G
         Frequency
            Data


                 YRI:
                  A=0.5852
                  G=0.4148
         Sudmant et al., 2010
Kidd et al, 2007 APOBEC cluster




BLACK: Deletion
White: Insertion
http://www.ncbi.nlm.nih.gov/dbvar
Variant Call Ambiguity
         start                                                    stop




 Probes with decreased signal intensity
 Probes with expected signal intensity
        breakpoint                                           breakpoint


            Inner start                                      Inner stop




    Outer start                                              Outer stop
                                  Inner start   Inner stop
Fosmid clone (40 Kb +/- 1 Kb)
Variant Call Ambiguity
   Outer start                                        Outer stop




                         20Kb      Clone has an insertion
                                   relative to the genome
Clone has a deletion
relative to the genome     60 Kb
Large-Scale Variation Complicates Genome Assembly

         Sequences from haplotype 1
         Sequences from haplotype 2




Old Assembly model: compress into a consensus



New Assembly model: represent both haplotypes
MHC (chr6)
Chr 6 representation (PGF)




Alt_Ref_Locus_2 (COX)
Church et al., 2011 PLoS Biology




http://genomereference.org
UGT2B17   MHC                  MAPT    GRCh37 (hg19)




                             7 alternate haplotypes
                                        at the MHC

                               Alternate loci released as:
                                                    FASTA
                                                      AGP
                              Alignment to chromosome


http://genomereference.org
Richa Agarwala
Eugene Yaschenko
71 Novel PATCHES: Additional sequence added
70 Fix PATCHES: Chromosome will update in GRCh38

                              Summer of 2013
                              Releasing patches quarterly
GRCh37 chr17




GRCh37 Myo19 Fix Patch
Dennis et al., 2012




        1q32          1q21    1p21

1p21 patch alignment to chromosome 1
Thanks!
 The Genome Reference Consortium
   The Genome Center at Washington University
   The Wellcome Trust Sanger Institute
   The European Bioinformatics Institute
   The National Center for Biotechnology Information

Church group at NCBI For Slides:                       1000 Genome browser:
 Valerie Schneider         Evan Eichler                 Doug Slotta
 Nathan Bouk                                            Eugene Yaschenko
 Hsiu-Chuan Chen                                        Victor Ananiev
 Peter Meric                                            Lon Phan
 Victor Ananiev                                         Steve Sherry
 Chao Chen       Alt-Aware Alignments:
                                                        Rob Cohen
 John Lopez        Richa Agarwala
                                                        Deanna Church
 John Garner       Eugene Yaschenko
 Tim Hefferon
 Cliff Clausen
                   Chunlin Xiao
                   Steve Sherry                                 NCBI

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Church isca2012

  • 1. Genome Representation and Variant Identification Deanna M. Church ISCA Consortium Conference
  • 2. From Green ED et al. Nature 2011
  • 4. Multiple Suspect submissions 1000G Frequency Data YRI: A=0.5852 G=0.4148 Sudmant et al., 2010
  • 5. Kidd et al, 2007 APOBEC cluster BLACK: Deletion White: Insertion
  • 7. Variant Call Ambiguity start stop Probes with decreased signal intensity Probes with expected signal intensity breakpoint breakpoint Inner start Inner stop Outer start Outer stop Inner start Inner stop
  • 8. Fosmid clone (40 Kb +/- 1 Kb) Variant Call Ambiguity Outer start Outer stop 20Kb Clone has an insertion relative to the genome Clone has a deletion relative to the genome 60 Kb
  • 9.
  • 10. Large-Scale Variation Complicates Genome Assembly Sequences from haplotype 1 Sequences from haplotype 2 Old Assembly model: compress into a consensus New Assembly model: represent both haplotypes
  • 11. MHC (chr6) Chr 6 representation (PGF) Alt_Ref_Locus_2 (COX)
  • 12. Church et al., 2011 PLoS Biology http://genomereference.org
  • 13. UGT2B17 MHC MAPT GRCh37 (hg19) 7 alternate haplotypes at the MHC Alternate loci released as: FASTA AGP Alignment to chromosome http://genomereference.org
  • 15. 71 Novel PATCHES: Additional sequence added 70 Fix PATCHES: Chromosome will update in GRCh38 Summer of 2013 Releasing patches quarterly
  • 16.
  • 18. Dennis et al., 2012 1q32 1q21 1p21 1p21 patch alignment to chromosome 1
  • 19. Thanks! The Genome Reference Consortium The Genome Center at Washington University The Wellcome Trust Sanger Institute The European Bioinformatics Institute The National Center for Biotechnology Information Church group at NCBI For Slides: 1000 Genome browser: Valerie Schneider Evan Eichler Doug Slotta Nathan Bouk Eugene Yaschenko Hsiu-Chuan Chen Victor Ananiev Peter Meric Lon Phan Victor Ananiev Steve Sherry Chao Chen Alt-Aware Alignments: Rob Cohen John Lopez Richa Agarwala Deanna Church John Garner Eugene Yaschenko Tim Hefferon Cliff Clausen Chunlin Xiao Steve Sherry NCBI

Editor's Notes

  1. Focal segmental glomerulosclerosis 4
  2. Put plug for Tim here…