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2015 ; 47
(3
): 296-303
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Large multiallelic copy number variations in humans
#MMPMID25621458
Handsaker RE
; Van Doren V
; Berman JR
; Genovese G
; Kashin S
; Boettger LM
; McCarroll SA
Nat Genet
2015[Mar]; 47
(3
): 296-303
PMID25621458
show ga
Thousands of genomic segments appear to be present in widely varying copy numbers
in different human genomes. We developed ways to use increasingly abundant
whole-genome sequence data to identify the copy numbers, alleles and haplotypes
present at most large multiallelic CNVs (mCNVs). We analyzed 849 genomes
sequenced by the 1000 Genomes Project to identify most large (>5-kb) mCNVs,
including 3,878 duplications, of which 1,356 appear to have 3 or more segregating
alleles. We find that mCNVs give rise to most human variation in gene
dosage-seven times the combined contribution of deletions and biallelic
duplications-and that this variation in gene dosage generates abundant variation
in gene expression. We describe 'runaway duplication haplotypes' in which genes,
including HPR and ORM1, have mutated to high copy number on specific haplotypes.
We also describe partially successful initial strategies for analyzing mCNVs via
imputation and provide an initial data resource to support such analyses.