Genotype complements the phenotype: identification of the pathogenicity of an LMNA splice variant by nanopore long-read sequencing in a large DCM family
Dilated cardiomyopathy (DCM) is a common cause of heart failure (HF) and is of familial origin in 20-40% of cases. Genetic testing by next-generation sequencing (NGS) has yielded a definite diagnosis in many cases; however, some remain elusive. In this study, we used a combination of NGS, human-indu...
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| Hauptverfasser: | , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
13 October 2022
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| In: |
International journal of molecular sciences
Year: 2022, Jahrgang: 23, Heft: 20, Pages: 1-11 |
| ISSN: | 1422-0067 |
| DOI: | 10.3390/ijms232012230 |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.3390/ijms232012230 Verlag, Volltext: https://www.mdpi.com/1422-0067/23/20/12230 
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| Verfasserangaben: | Farbod Sedaghat-Hamedani, Sabine Rebs, Elham Kayvanpour, Chenchen Zhu, Ali Amr, Marion Müller, Jan Haas, Jingyan Wu, Lars M. Steinmetz, Philipp Ehlermann, Katrin Streckfuss-Bömeke, Norbert Frey and Benjamin Meder |
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| 245 | 1 | 0 | |a Genotype complements the phenotype |b identification of the pathogenicity of an LMNA splice variant by nanopore long-read sequencing in a large DCM family |c Farbod Sedaghat-Hamedani, Sabine Rebs, Elham Kayvanpour, Chenchen Zhu, Ali Amr, Marion Müller, Jan Haas, Jingyan Wu, Lars M. Steinmetz, Philipp Ehlermann, Katrin Streckfuss-Bömeke, Norbert Frey and Benjamin Meder |
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| 520 | |a Dilated cardiomyopathy (DCM) is a common cause of heart failure (HF) and is of familial origin in 20-40% of cases. Genetic testing by next-generation sequencing (NGS) has yielded a definite diagnosis in many cases; however, some remain elusive. In this study, we used a combination of NGS, human-induced pluripotent-stem-cell-derived cardiomyocytes (iPSC-CMs) and nanopore long-read sequencing to identify the causal variant in a multi-generational pedigree of DCM. A four-generation family with familial DCM was investigated. Next-generation sequencing (NGS) was performed on 22 family members. Skin biopsies from two affected family members were used to generate iPSCs, which were then differentiated into iPSC-CMs. Short-read RNA sequencing was used for the evaluation of the target gene expression, and long-read RNA nanopore sequencing was used to evaluate the relevance of the splice variants. The pedigree suggested a highly penetrant, autosomal dominant mode of inheritance. The phenotype of the family was suggestive of laminopathy, but previous genetic testing using both Sanger and panel sequencing only yielded conflicting evidence for LMNA p.R644C (rs142000963), which was not fully segregated. By re-sequencing four additional affected family members, further non-coding LMNA variants could be detected: rs149339264, rs199686967, rs201379016, and rs794728589. To explore the roles of these variants, iPSC-CMs were generated. RNA sequencing showed the LMNA expression levels to be significantly lower in the iPSC-CMs of the LMNA variant carriers. We demonstrated a dysregulated sarcomeric structure and altered calcium homeostasis in the iPSC-CMs of the LMNA variant carriers. Using targeted nanopore long-read sequencing, we revealed the biological significance of the variant c.356+1G>A, which generates a novel 5′ splice site in exon 1 of the cardiac isomer of LMNA, causing a nonsense mRNA product with almost complete RNA decay and haploinsufficiency. Using novel molecular analysis and nanopore technology, we demonstrated the pathogenesis of the rs794728589 (c.356+1G>A) splice variant in LMNA. This study highlights the importance of precise diagnostics in the clinical management and workup of cardiomyopathies. | ||
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