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Cytogenet Genome Res. 2017;152(3):117-121. doi: 10.1159/000479463. Epub 2017 Aug 31.

Genomic and Cytogenetic Characterization of a Balanced Translocation Disrupting NUP98.

Author information

1
Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada.

Abstract

A 41-year-old Asian woman with bilateral renal angiomyolipomas (AML) was incidentally identified to have a balanced translocation, 46,XX,t(11;12)(p15.4;q15). She had no other features or family history to suggest a diagnosis of tuberous sclerosis. Her healthy daughter had the same translocation and no renal AML at the age of 3 years. Whole-genome sequencing was performed on genomic maternal DNA isolated from blood. A targeted de novo assembly was then conducted with ABySS for chromosomes 11 and 12. Sanger sequencing was used to validate the translocation breakpoints. As a result, genomic characterization of chromosomes 11 and 12 revealed that the 11p breakpoint disrupted the NUP98 gene in intron 1, causing a separation of the promoter and transcription start site from the rest of the gene. The translocation breakpoint on chromosome 12q was located in a gene desert. NUP98 has not yet been associated with renal AML pathogenesis, but somatic NUP98 alterations are recurrently implicated in hematological malignancies, most often following a gene fusion event. We also found evidence for complex structural events involving chromosome 12, which appear to disrupt the TDG gene. We identified a TDGP1 partially processed pseudogene at 12p12.1, which adds complexity to the de novo assembly. In conclusion, this is the first report of a germline constitutional structural chromosome rearrangement disrupting NUP98 that occurred in a generally healthy woman with bilateral renal AML.

KEYWORDS:

Balanced translocation; Pseudogene; Renal angiomyolipomas; Tuberous sclerosis; Whole-genome sequencing

PMID:
28854430
DOI:
10.1159/000479463
[Indexed for MEDLINE]

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