Consideration of the haplotype diversity at nonallelic homologous recombination hotspots improves the precision of rearrangement breakpoint identification.
Hum Mutat
; 38(12): 1711-1722, 2017 12.
Article
em En
| MEDLINE
| ID: mdl-28862369
ABSTRACT
Precise characterization of nonallelic homologous recombination (NAHR) breakpoints is key to identifying those features that influence NAHR frequency. Until now, analysis of NAHR-mediated rearrangements has generally been performed by comparison of the breakpoint-spanning sequences with the human genome reference sequence. We show here that the haplotype diversity of NAHR hotspots may interfere with breakpoint-mapping. We studied the transmitting parents of individuals with germline type-1 NF1 deletions mediated by NAHR within the paralogous recombination site 1 (PRS1) or paralogous recombination site 2 (PRS2) hotspots. Several parental wild-type PRS1 and PRS2 haplotypes were identified that exhibited considerable sequence differences with respect to the reference sequence, which also affected the number of predicted PRDM9-binding sites. Sequence comparisons between the parental wild-type PRS1 or PRS2 haplotypes and the deletion breakpoint-spanning sequences from the patients (method #2) turned out to be an accurate means to assign NF1 deletion breakpoints and proved superior to crude reference sequence comparisons that neglect to consider haplotype diversity (method #1). The mean length of the deletion breakpoint regions assigned by method #2 was 269-bp in contrast to 502-bp by method #1. Our findings imply that paralog-specific haplotype diversity of NAHR hotspots (such as PRS2) and population-specific haplotype diversity must be taken into account in order to accurately ascertain NAHR-mediated rearrangement breakpoints.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Genoma Humano
/
Neurofibromatose 1
/
Recombinação Homóloga
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Humans
Idioma:
En
Revista:
Hum Mutat
Assunto da revista:
GENETICA MEDICA
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Alemanha