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Yadav N, Kirola L, Geetha TS, Mittal K, Kadandale J, Yogev Y, Birk OS, Gupta N, Balakrishnan P, Jana M, Gupta M, Kabra M, Thelma BK. A novel leaky splice variant in centromere protein J (CENPJ)-associated Seckel syndrome. Ann Hum Genet 2022; 86:245-256. [PMID: 35451063 DOI: 10.1111/ahg.12469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 03/12/2022] [Accepted: 03/31/2022] [Indexed: 11/29/2022]
Abstract
Primary microcephaly and Seckel syndrome are rare genetically and clinically heterogenous brain development disorders. Several exonic/splicing mutations are reported for these disorders to date, but ∼40% of all cases remain unexplained. We aimed to uncover the genetic correlate(s) in a family of multiple siblings with microcephaly. A novel homozygous intronic variant (NC_000013.10:g.25459823T>C) in CENPJ (13q12) segregating with all four affected male siblings was identified by exome sequencing and validated by targeted linkage approach (logarithm of the odds score 1.8 at θ 0.0). RT-PCR of CENPJ in affected siblings using their EBV derived cell lines showed aberrant transcripts suggestive of exon skipping confirmed by Sanger sequencing. Significantly reduced wild type transcript/protein in the affected siblings having the splice variant indicates a leaky gene expression of pathological relevance. Based on known CENPJ function, assessing for mitotic alterations revealed defect in centrosome duplication causing mono/multicentrosome(s) at prophase, delayed metaphase, and unequal chromosomal segregation in patient cells. Clinical features witnessed in this study expand the spectrum of CENPJ-associated primary microcephaly and Seckel syndrome. Furthermore, besides the importance of regulatory variants in classical monogenic disorders these findings provide new insights into splice site biology with possible implications for ASO-based therapies.
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Affiliation(s)
- Navneesh Yadav
- Department of Genetics, University of Delhi South Campus, New Delhi, India
| | - Laxmi Kirola
- Department of Genetics, University of Delhi South Campus, New Delhi, India.,Department of Molecular and Human Genetics, Banaras Hindu University, Uttar Pradesh, India
| | - Thenral S Geetha
- Department of Genetics, University of Delhi South Campus, New Delhi, India.,Medgenome, Labs, Bangalore, India
| | - Kirti Mittal
- Department of Genetics, University of Delhi South Campus, New Delhi, India.,Lunenfeld-Tanenbaum, Research Institute, Toronto, Canada
| | | | - Yuval Yogev
- The Morris Kahn Laboratory of Human Genetics, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Ohad S Birk
- The Morris Kahn Laboratory of Human Genetics, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Neerja Gupta
- Division of Genetics, Department of Paediatrics, All India Institute of Medical Sciences, New Delhi, India
| | - Prahlad Balakrishnan
- Division of Genetics, Department of Paediatrics, All India Institute of Medical Sciences, New Delhi, India.,Genes2me, Haryana, India
| | - Manisha Jana
- Department of Radiodiagnosis, All India Institute of Medical Sciences, New Delhi, India
| | - Meena Gupta
- Department of Neurology, Institute of Human Behaviour and Allied Sciences, New Delhi, India.,Department of Neurology, Paras Hospitals, Haryana, India
| | - Madhulika Kabra
- Division of Genetics, Department of Paediatrics, All India Institute of Medical Sciences, New Delhi, India
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Wang Z, Liu T. Placental growth factor signaling regulates isoform splicing of vascular endothelial growth factor A in the control of lung cancer cell metastasis. Mol Cell Biochem 2017; 439:163-169. [PMID: 28861767 DOI: 10.1007/s11010-017-3145-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 08/02/2017] [Indexed: 12/13/2022]
Abstract
Vascular endothelial growth factor (VEGF) family members play critical and complex roles in the regulation of cancer vascularization and metastasis. The exact molecular control of lung cancer metastasis by VEGF family members is not completely understood. Here, we showed that specimens from non-small cell lung cancer (NSCLC) contained significantly higher levels of placental growth factor (PlGF) than paired non-cancer tissue (p < 0.05, N = 25). Moreover, higher levels of PlGF were detected in NSCLC specimens from the patients who had distal metastases than those who had not. High-PlGF levels appeared to be associated with poor patient survival. In vitro, PlGF dose-dependently increased the ratio of pro-angiogenic VEGF isoform (VEGF165) versus anti-angiogenic VEGF isoform (VEGF165b), seemingly through induction of expression of splicing regulatory factor SRp40, resulting in the enhancement of the cancer cell metastatic potential. Higher levels of SRp40 were detected in NSCLC specimens, compared to paired non-cancer tissue (p < 0.05, N = 25). Finally, a strong correlation was detected between the levels of PlGF and SRp40 in NSCLC specimens (r = 0.83, p < 0.0001, N = 25). Together, these data suggest that PlGF may increase NSCLC metastasis through SRp40-mediated mRNA splicing of VEGF.
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Affiliation(s)
- Zanfeng Wang
- Department of Respiratory Medicine, First Affiliated Hospital of China Medical University, 155 Nanjing North Street, Shenyang, 110001, China.
| | - Tingwei Liu
- Department of Respiratory Medicine, First Affiliated Hospital of China Medical University, 155 Nanjing North Street, Shenyang, 110001, China
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