Abstract:
BACKGROUND:Fanconi anemia (FA) affects only one in 130,000 births, but has severe and diverse clinical consequences. It has been theorized that defects in the FA DNA cross-link repair complex lead to a spectrum of variants that are responsible for those diverse clinical phenotypes. METHODS:Using NextGen sequencing, we show that a clinically derived FA cell line had accumulated numerous genetic variants, including high-impact mutations, such as deletion of start codons, introduction of premature stop codons, missense mutations, and INDELs. RESULTS:About 65% of SNPs and 55% of INDELs were found to be commonly present in both the FA dysfunctional and retrovirally corrected cell lines, showing their common origin. The number of INDELs, but not SNPs, is decreased in FANCD2-corrected samples, suggesting that FANCD2 deficiency preferentially promotes the origin of INDELs. These genetic modifications had a considerable effect on the transcriptome, with statistically significant changes in the expression of 270 genes. These genetic and transcriptomic variants significantly impacted pathways and molecular functions, spanning a diverse spectrum of disease phenotypes/symptoms, consistent with the disease diversity seen in FA patients. CONCLUSION:These results underscore the consequences of defects in the DNA cross-link repair mechanism and indicate that accumulating diverse mutations from individual parent cells may make it difficult to anticipate the longitudinal clinical behavior of emerging disease states in an individual with FA.
journal_name
Mol Genet Genomic Medjournal_title
Molecular genetics & genomic medicineauthors
Velmurugan KR,Michalak P,Kang L,Fonville NC,Garner HRdoi
10.1002/mgg3.502subject
Has Abstractpub_date
2018-11-01 00:00:00pages
1199-1208issue
6issn
2324-9269journal_volume
6pub_type
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