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Shehata BM, Cundiff CA, Lee K, Sabharwal A, Lalwani MK, Davis AK, Agrawal V, Sivasubbu S, Iannucci GJ, Gibson G. Exome sequencing of patients with histiocytoid cardiomyopathy reveals a de novo NDUFB11 mutation that plays a role in the pathogenesis of histiocytoid cardiomyopathy. Am J Med Genet A 2015; 167A:2114-21. [PMID: 25921236 DOI: 10.1002/ajmg.a.37138] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Accepted: 04/06/2015] [Indexed: 11/11/2022]
Abstract
Histiocytoid cardiomyopathy (Histiocytoid CM) is a rare form of cardiomyopathy observed predominantly in newborn females that is fatal unless treated early in life. We have performed whole exome sequencing on five parent-proband trios and identified nuclear-encoded mitochondrial protein mutations in three cases. The molecular genetic basis of Histiocytoid CM remains unknown despite several hypotheses in medical literature. The findings presented in this manuscript may represent components of genetic etiologies for this heterogeneous disease. Two probands had de novo non-sense mutations in the second exon of the X-linked nuclear gene NDUFB11. A third proband was doubly heterozygous for inherited rare variants in additional components of complex I, NDUFAF2 and NDUFB9, confirming that Histiocytoid CM is genetically heterogeneous. In a fourth case, the proband with Histiocytoid CM inherited a mitochondrial mutation from her heteroplasmic mother, as did her brother who presented with cardiac arrhythmia. Strong candidate recessive or compound heterozygous variants were not found for this individual or for the fifth case. Although NDUFB11 has not been implicated before in cardiac pathology, morpholino-mediated knockdown of ndufb11 in zebrafish embryos generated defective cardiac tissue with cardiomegaly, looping defects, and arrhythmia which suggests the role of NDUFB11 in the pathogenesis of this abnormal cardiac pathology. Taken together, the unbiased whole exome sequencing approach confirms the suspected genetic heterogeneity of Histiocytoid CM. Therefore, the novel NDUFB11 mutation may cause a complex 1 deficiency in synergy with additional unknown mtDNA variants.
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Affiliation(s)
| | - Caitlin A Cundiff
- School of Medicine, Emory University, Atlanta, Georgia.,School of Biology, CSIR Georgia Institute of Technology, Atlanta, Georgia
| | - Kevin Lee
- School of Biology, CSIR Georgia Institute of Technology, Atlanta, Georgia
| | - Ankit Sabharwal
- Genomics and Molecular Medicine, Institute of Genomics and Integrative Biology, Delhi, India.,Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, New Delhi, India
| | - Mukesh Kumar Lalwani
- Genomics and Molecular Medicine, Institute of Genomics and Integrative Biology, Delhi, India
| | | | - Vartika Agrawal
- School of Biology, CSIR Georgia Institute of Technology, Atlanta, Georgia
| | - Sridhar Sivasubbu
- Genomics and Molecular Medicine, Institute of Genomics and Integrative Biology, Delhi, India.,Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhavan, New Delhi, India
| | | | - Greg Gibson
- School of Medicine, Emory University, Atlanta, Georgia.,School of Biology, CSIR Georgia Institute of Technology, Atlanta, Georgia
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