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Identification and analysis of deletion breakpoints in four Mohr-Tranebjærg syndrome (MTS) patients.

Authors :
Rendtorff ND
Karstensen HG
Lodahl M
Tolmie J
McWilliam C
Bak M
Tommerup N
Nazaryan-Petersen L
Kunst H
Wong M
Joss S
Carelli V
Tranebjærg L
Source :
Scientific reports [Sci Rep] 2022 Sep 02; Vol. 12 (1), pp. 14959. Date of Electronic Publication: 2022 Sep 02.
Publication Year :
2022

Abstract

Mohr-Tranebjærg syndrome is an X-linked syndrome characterized by sensorineural hearing impairment in childhood, followed by progressive neurodegeneration leading to a broad phenotypic spectrum. Genetically MTS is caused by pathogenic variants in the TIMM8A gene, including gene deletions and larger contiguous gene deletions. Some of the latter involve the neighboring gene BTK, resulting in agammaglobulinemia. By next-generation mate-pair sequencing we have mapped the chromosomal deletion breakpoints of one MTS case and three XLA-MTS cases and used breakpoint-spanning PCR to fine map the breakpoints by Sanger sequencing. Two of the XLA-MTS cases presented with large deletions (63.5 and 27.2 kb), and the junctional regions were characterized by long stretches of microhomology, indicating that the events have emerged through homologous recombination. Conversely, the MTS case exhibited a small 2 bp region of microhomology, and the regions were not characterized by extensive microhomology. The third XLA-MTS case had a more complex breakpoint, including a 59 bp inverted insertion, thus at least four breakpoints were involved in this event. In conclusion, mate-pair library generation combined with next-generation sequencing is an efficient method for breakpoint identification, also in regions characterized by repetitive elements.<br /> (© 2022. The Author(s).)

Details

Language :
English
ISSN :
2045-2322
Volume :
12
Issue :
1
Database :
MEDLINE
Journal :
Scientific reports
Publication Type :
Academic Journal
Accession number :
36056138
Full Text :
https://doi.org/10.1038/s41598-022-18040-y