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Nonallelic homologous recombination between retrotransposable elements is a driver of de novo unbalanced translocations

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TLDR
The existence of compound maternal/paternal derivative chromosomes is shown, reinforcing the hypothesis that human cleavage stage embryogenesis is a cradle of chromosomal rearrangements and exposes a profoundly different mutational mechanism compared with balanced chromosomal translocations.
Abstract
Large-scale analysis of balanced chromosomal translocation breakpoints has shown nonhomologous end joining and microhomology-mediated repair to be the main drivers of interchromosomal structural aberrations. Breakpoint sequences of de novo unbalanced translocations have not yet been investigated systematically. We analyzed 12 de novo unbalanced translocations and mapped the breakpoints in nine. Surprisingly, in contrast to balanced translocations, we identify nonallelic homologous recombination (NAHR) between (retro)transposable elements and especially long interspersed elements (LINEs) as the main mutational mechanism. This finding shows yet another involvement of (retro)transposons in genomic rearrangements and exposes a profoundly different mutational mechanism compared with balanced chromosomal translocations. Furthermore, we show the existence of compound maternal/paternal derivative chromosomes, reinforcing the hypothesis that human cleavage stage embryogenesis is a cradle of chromosomal rearrangements.

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Journal ArticleDOI

Mechanisms underlying structural variant formation in genomic disorders

TL;DR: These reports showcase the influence of repeat sequences on genomic stability and structural variant complexity and also highlight the tremendous plasticity and dynamic nature of the genome in evolution, health and disease susceptibility.
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Single Cell Genomics: Advances and Future Perspectives

TL;DR: The major technological and biological breakthroughs achieved are reviewed, the remaining challenges to overcome are described, and a glimpse into the promise of recent and future developments are provided.
Journal ArticleDOI

Histone H3.3 is required for endogenous retroviral element silencing in embryonic stem cells

TL;DR: This study identifies a unique heterochromatin state marked by the presence of both H3.3 and H3K9me3, and establishes an important role for H 3.3 in control of ERV retrotransposition in embryonic stem cells.
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Coevolution between transposable elements and recombination

TL;DR: It is hypothesized that TE insertion polymorphism may be important in driving within-species variation in recombination rates in surrounding genomic regions, and the interaction between TEs and recombination may create positive feedback, whereby TE accumulation in non-recombining regions contributes to the spread of recombination suppression.
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Human Structural Variation: Mechanisms of Chromosome Rearrangements.

TL;DR: The genomic organization of simple and complex constitutional SVs, as well as the molecular mechanisms of their formation are reviewed, including non-allelic homologous recombination between paralogous long interspersed nuclear element (LINE) or human endogenous retrovirus (HERV) repeats as a cause of deletions, duplications, and translocations.
References
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Journal ArticleDOI

Fast and accurate short read alignment with Burrows–Wheeler transform

TL;DR: Burrows-Wheeler Alignment tool (BWA) is implemented, a new read alignment package that is based on backward search with Burrows–Wheeler Transform (BWT), to efficiently align short sequencing reads against a large reference sequence such as the human genome, allowing mismatches and gaps.
Journal ArticleDOI

Initial sequencing and analysis of the human genome.

Eric S. Lander, +248 more
- 15 Feb 2001 - 
TL;DR: The results of an international collaboration to produce and make freely available a draft sequence of the human genome are reported and an initial analysis is presented, describing some of the insights that can be gleaned from the sequence.
Journal ArticleDOI

Cytosine methylation and the ecology of intragenomic parasites

TL;DR: It has become increasingly difficult to hold that reversible promoter methylation is commonly involved in developmental gene control; instead, suppression of parasitic sequence elements appears to be the primary function of cytosine methylation, with crucial secondary roles in allele-specific gene expression as seen in X inactivation and genomic imprinting.
Journal ArticleDOI

Mechanisms of change in gene copy number

TL;DR: Current models of the mechanisms that cause copy number variation focus on perturbation of DNA replication and replication of non-contiguous DNA segments and cellular stress might induce repair of broken replication forks to switch from high-fidelity homologous recombination to non-homologous repair, thus promoting copy number change.
Journal ArticleDOI

MMEJ repair of double-strand breaks (director’s cut): deleted sequences and alternative endings

TL;DR: A mechanistic model for MMEJ is proposed and important questions for future research are highlighted, including how microhomology contributes to oncogenic chromosome rearrangements and genetic variation in humans.
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Initial sequencing and analysis of the human genome.

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