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Structural variation of the gorilla genome

ABSTRACT: Structural variation has played an important role in the evolutionary restructuring of human and great ape genomes. We generated approximately 10-fold genomic sequence coverage from a western lowland gorilla and integrated these data into a physical and cytogenetic framework to develop a comprehensive view of structural variation. We discovered and validated over 7,665 structural changes within the gorilla lineage including sequence resolution of inversions, deletions, duplications and retrotranspositions. A comparison with human and other ape genomes shows that the gorilla genome has been subjected to the highest rate of segmental duplication. We show that both the gorilla and chimpanzee genomes have experienced independent yet parallel patterns of structural mutation that have not occurred in humans, including the formation of subtelomeric heterochromatic caps, the hyperexpansion of segmental duplications and bursts of retroviral integrations. Our analysis suggests that the chimpanzee and gorilla genomes are structurally more derived than either orangutan or human.

ORGANISM(S): Gorilla gorilla Pan troglodytes Homo sapiens

PROVIDER: GSE27072 | GEO | 2011/05/01

SECONDARY ACCESSION(S): PRJNA137559

REPOSITORIES: GEO

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Structural variation of the gorilla genome

Project description:Structural variation has played an important role in the evolutionary restructuring of human and great ape genomes. We generated approximately 10-fold genomic sequence coverage from a western lowland gorilla and integrated these data into a physical and cytogenetic framework to develop a comprehensive view of structural variation. We discovered and validated over 7,665 structural changes within the gorilla lineage including sequence resolution of inversions, deletions, duplications and retrotranspositions. A comparison with human and other ape genomes shows that the gorilla genome has been subjected to the highest rate of segmental duplication. We show that both the gorilla and chimpanzee genomes have experienced independent yet parallel patterns of structural mutation that have not occurred in humans, including the formation of subtelomeric heterochromatic caps, the hyperexpansion of segmental duplications and bursts of retroviral integrations. Our analysis suggests that the chimpanzee and gorilla genomes are structurally more derived than either orangutan or human. all combinations of human, chimpanzee and gorilla are used in 2 different arrayCGH designs. First, a standard 2.1 was used to detected CNVs, and second, we used a custom designed arrayCGH to validate gorilla specific duplications and deletions

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Project description:Wilson and King were among the first to recognize that the extent of phenotypic change between humans and great apes was dissonant with the rate of molecular change. Proteins are virtually identical; cytogenetically there are few rearrangements that distinguish ape-human chromosomes; rates of single-basepair change and retroposon activity have slowed particularly within hominid lineages when compared to rodents or monkeys. Here, we perform a systematic analysis of duplication content of four primate genomes (macaque, orangutan, chimpanzee and human) in an effort to understand the pattern and rates of genomic duplication during hominid evolution. We find that the ancestral branch leading to human and African great apes shows the most significant increase in duplication activity both in terms of basepairs and in terms of events. This duplication acceleration within the ancestral species is significant when compared to lineage-specific rate estimates even after accounting for copy-number polymorphism and homoplasy. We discover striking examples of recurrent and independent gene-containing duplications within the gorilla and chimpanzee that are absent in the human lineage. Our results suggest that the evolutionary properties of copy-number mutation differ significantly from other forms of genetic mutation and, in contrast to the hominid slowdown of single basepair mutations, there has been a genomic burst of duplication activity at this period during human evolution. A total of 3 chimpanzees, 2 bonobos, 3 gorillas, 1 orangutan and 1 macaque were hybridized against human (NA15510). Other hybridizations (other humans, and non-humans) were also used as a replicate.

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