Analysis of short tandem repeat expansions and their methylation state with nanopore sequencing.

Abstract:

:Expansions of short tandem repeats are genetic variants that have been implicated in several neuropsychiatric and other disorders, but their assessment remains challenging with current polymerase-based methods1-4. Here we introduce a CRISPR-Cas-based enrichment strategy for nanopore sequencing combined with an algorithm for raw signal analysis. Our method, termed STRique for short tandem repeat identification, quantification and evaluation, integrates conventional sequence mapping of nanopore reads with raw signal alignment for the localization of repeat boundaries and a hidden Markov model-based repeat counting mechanism. We demonstrate the precise quantification of repeat numbers in conjunction with the determination of CpG methylation states in the repeat expansion and in adjacent regions at the single-molecule level without amplification. Our method enables the study of previously inaccessible genomic regions and their epigenetic marks.

journal_name

Nat Biotechnol

journal_title

Nature biotechnology

authors

Giesselmann P,Brändl B,Raimondeau E,Bowen R,Rohrandt C,Tandon R,Kretzmer H,Assum G,Galonska C,Siebert R,Ammerpohl O,Heron A,Schneider SA,Ladewig J,Koch P,Schuldt BM,Graham JE,Meissner A,Müller FJ

doi

10.1038/s41587-019-0293-x

subject

Has Abstract

pub_date

2019-12-01 00:00:00

pages

1478-1481

issue

12

eissn

1087-0156

issn

1546-1696

pii

10.1038/s41587-019-0293-x

journal_volume

37

pub_type

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