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The genomic landscape of balanced cytogenetic abnormalities associated with human congenital anomalies.

Abstract：

:Despite the clinical significance of balanced chromosomal abnormalities (BCAs), their characterization has largely been restricted to cytogenetic resolution. We explored the landscape of BCAs at nucleotide resolution in 273 subjects with a spectrum of congenital anomalies. Whole-genome sequencing revised 93% of karyotypes and demonstrated complexity that was cryptic to karyotyping in 21% of BCAs, highlighting the limitations of conventional cytogenetic approaches. At least 33.9% of BCAs resulted in gene disruption that likely contributed to the developmental phenotype, 5.2% were associated with pathogenic genomic imbalances, and 7.3% disrupted topologically associated domains (TADs) encompassing known syndromic loci. Remarkably, BCA breakpoints in eight subjects altered a single TAD encompassing MEF2C, a known driver of 5q14.3 microdeletion syndrome, resulting in decreased MEF2C expression. We propose that sequence-level resolution dramatically improves prediction of clinical outcomes for balanced rearrangements and provides insight into new pathogenic mechanisms, such as altered regulation due to changes in chromosome topology.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Redin C,Brand H,Collins RL,Kammin T,Mitchell E,Hodge JC,Hanscom C,Pillalamarri V,Seabra CM,Abbott MA,Abdul-Rahman OA,Aberg E,Adley R,Alcaraz-Estrada SL,Alkuraya FS,An Y,Anderson MA,Antolik C,Anyane-Yeboa K,Atkin JF

doi

10.1038/ng.3720

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

36-45

issue

1

eissn

1061-4036

issn

1546-1718

pii

ng.3720

journal_volume

49

pub_type

杂志文章

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