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A Dominant C150Y Mutation in FHL1 Induces Structural Alterations in LIM2 Domain Causing Protein Aggregation In Human and Drosophila Indirect Flight Muscles

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Abstract

FHL1-related myopathies are rare X-linked dominant myopathies. Though clinically classified into several subgroups, spinal and scapuloperoneal muscle involvement are common to all. In this study, we identified c.449G > A, p.C150Y mutation by clinical exome sequencing in two patients from same family (son and mother) of Indian origin who presented with multiple contractures. Muscle biopsy showed numerous intracytoplasmic aggregates intensely stained on HE and MGT. The strong reactions to M-NBT revealed aggregates to be reducing bodies and positively labeled to anti-FHL1 antibody. Ultrastructurally, Z-band streaming and granular and granulofilamentous material were seen. Further, the translational evidence of mutant peptide was confirmed using mass spectrometric analysis. To establish p.C150Y as the cause for protein aggregation, in vivo studies were carried out using transgenic Drosophila model which highlighted Z-band abnormalities and protein aggregates in indirect flight muscles with compromised physiological function. Thus, recapitulating the X-linked human disease phenotype. Additionally, the molecular dynamics simulation analysis unraveled the drastic change in α-helix of LIM2, the region immediately next to site of C150Y mutation that could be the plausible cause for protein aggregation. To the best of our knowledge, this is the first study of p.C150Y mutation in FHL1 identified in Indian patients with in vivo and in silico analysis to establish the cause for protein aggregation in muscle.

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Acknowledgments

We are thankful to the patients for participating in this study. We are also grateful to Dr. Carsten G. Bonnemann, NIH, USA, for providing FHL1 antibody.

Funding

The work was supported by the Department of Science and Technology (DST Ref No. F.NO.SR/SO/HS-103/2009/1(G)dated 8 Sept 2011), Government of India.

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Correspondence to Gayathri Narayanappa.

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All the authors declare that there is no conflict of interest.

Ethical Approval

The study was approved by the Institute ethical committee (NIMHANS IEC NO. Sl.No.1, Clinical Neurosciences). Written informed consent was taken from patients prior to inclusion in the study.

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Santhoshkumar, R., Preethish-Kumar, V., Mangalaparthi, K. et al. A Dominant C150Y Mutation in FHL1 Induces Structural Alterations in LIM2 Domain Causing Protein Aggregation In Human and Drosophila Indirect Flight Muscles. J Mol Neurosci 71, 2324–2335 (2021). https://doi.org/10.1007/s12031-020-01777-4

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  • DOI: https://doi.org/10.1007/s12031-020-01777-4

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