gene conversion-like events in the analysis of vh...
TRANSCRIPT
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Analysis of VH replacement and gene conversion-like events in the
joint diversity of IgHAnastasiya Vinogradova
Adel Gazizova
Oksana Ayzsilnieks, Andrey Slabodkin, Maria Chernigovskaya
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Antibodies structure
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VDJ recombination
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VDJ recombination
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VDJ recombination
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VDJ recombination
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Annotation
(IgBLAST, High-VQuest, Partis, iHMMune, etc.)
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v 3 D2 J3 Cv 2
D2 J3 Cv 2
footprint
N1 zone
VH replacement
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1. Identify VH replacement (VHR) in sequences
2. Associate found VHRs to phenotypes
3. Detect phenotype groups that significantly differ from each other
Goals of the project
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Results
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CDR3 length: Partis, iHMMune vs IgBLAST
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CDR3 length: High-VQuest vs IgBLAST
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1. Footprint must be in CDR3
2. Footprints can’t be in VH6.1 gene
3. Footprint V gene must be located before sequence V gene in the locus
4. Footprint must be in N1 zone
Footprints criteria
footprint
D 2 J3 CV 2
N1 zone
CDR3
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Footprints criteria
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● Healthy people● People with:
○ autoimmune diseases○ lymphomas○ leukemia○ chronic infections○ acute infections
Phenotypes
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Pipeline for phenotypes detection
Download data from GenBank
Parse files and eject titles
Use Partis to divide sequences into clonal
families
Exact footprint search
Footprint search with one mismatch
Analysis
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Exact footprint search
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Footprint search with 1 mismatch
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Results
1. We compared IGH annotation tools based on alignment and HMM
2. We created pipeline that searches footprints in IGH sequences
3. We analysed human IGH sequences with different phenotypes
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Thank you for your attention!
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Used dataset
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● Healthy people: N = 2742● Systemic lupus erythematosus: N = 1257● Multiple sclerosis: N = 202● X-linked hyper-IgM syndrome: N = 994● Wegners granuloma: N = 160● Chronic lymphocytic leukemia: N = 741● Hodgkin lymphoma: N = 98● Non-Hodgkin lymphomas: N = 328● Hepatitis C: N = 317● HIV-1: N = 80● Infectious mononucleosis: N = 130● Acute viral and bacterial infections: N = 249● Pneumococcal vaccine: N = 97
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х1 х3 х2
у1 у2 у3
a1
a2
a3
b1 b2 b3
х2
HMM