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Case Report Open Access

LMNA c.1622G>A mutation and myopathic changes in a family with limb‑girdle muscular dystrophy: A case report

  • Authors:
    • Yanling Zhu
    • Qiushi Wang
    • Tiefeng Zhang
  • View Affiliations / Copyright

    Affiliations: Department of Respiratory and Critical Care Medicine, Affiliated Banan Hospital of Chongqing Medical University, Chongqing 401320, P.R. China
    Copyright: © Zhu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 202
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    Published online on: June 2, 2026
       https://doi.org/10.3892/etm.2026.13198
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Abstract

The present study reports a case of limb‑girdle muscular dystrophy (LGMD) associated with a pathogenic lamin A/C (LMNA) mutation (c.1622G>A). Notably, this case expands the phenotypic and genotypic spectrum of LMNA‑related LGMD, and provides novel familial clinical and genetic evidence for this rare mutation. Genetic sequencing revealed a heterozygous mutation in both the proband and the mother of the proband, suggesting autosomal dominant inheritance. Electromyography (EMG) revealed reduced nerve conduction velocity and abnormal potentials in the proband and mother, indicating muscle weakness and atrophy. Magnetic resonance imaging (MRI) results showed symmetric muscle atrophy in the proximal muscles of the lower legs, with fatty tissue replacement. Both the proband and mother had elevated creatine kinase levels, whereas the father had normal levels. Transthoracic echocardiography ruled out severe heart disorders in the proband and mother. In conclusion, EMG and MRI findings indicated myopathic changes in the proband and the mother of the proband, confirming the significance of this mutation in LGMD. This familial case adds novel clinical, electrophysiological and imaging data to the existing literature on LMNA‑associated LGMD. Further genetic and clinical evaluations are required to understand the long‑term prognosis and potential treatment strategies for LMNA‑related LGMD.
View Figures

Figure 1

EMG and NCV data. (A) Proband EMG
recording: EMG of iliopsoas muscle shows multi-phase potentials,
irregular waveforms and reduced amplitude. (B) Proband NCV
recording: NCV of the common peroneal nerve shows reduced amplitude
and conduction velocity. (C) Proband F-wave response: F-wave shows
normal or slightly delayed latency. (D) Mother EMG recording: EMG
shows multi-phase potentials and irregular waveforms with amplitude
changes. (E) Mother NCV recording: NCV of the tibial nerve shows
normal amplitude and conduction velocity. (F) Mother F-wave
response: F-wave shows normal latency. (G) Father EMG recording:
Needle EMG of the tested muscles shows no abnormal spontaneous
activity or myopathic/neurogenic changes. (H) Father NCV recording:
Tibial nerve NCV shows normal parameters. (I) Father F-wave
response: F-wave shows normal latency. EMG, electromyogram; NCV,
nerve conduction velocity;

Figure 2

Magnetic resonance imaging of calf
muscles. Proband's mother: (A) The quick scan shows the inside
structure of the lower legs; (B) Short tau inversion recovery
images show bright areas in the back muscles of the lower legs; (C)
T1WI images show fat replacing tissue in the back muscles of the
lower legs; (D) T2WI images show changes in muscle structure after
fat has replaced it; (E) T2 FSE coronal images show changes in the
water content of the back muscles in the lower legs. Proband's
father: (F) The fast gradient recalled echo sequence shows the
inside structure of the lower leg; (G) T2 FSE Dixon coronal images
of the lower limbs reveal normal anatomical structures. Proband:
(H) The quick scan clearly shows the inside structure of the lower
leg; (I) T2 FSE Dixon coronal images of both legs. FSE, fast spin
echo.

Figure 3

Sanger sequencing verification
conducted on the proband and family members. The reference sequence
(top) shows the WT G and mutant A bases at the variant position
(red arrow). The proband and mother were het for the G>A
substitution and displayed overlapping G and A peaks at the variant
site. The father was homozygous for the WT G base, confirming a
de novo or maternally inherited origin of the variant in the
proband. WT, wild-type; het, heterozygous.

Figure 4

Transthoracic echocardiogram of the
proband. Upper panel: Color Doppler imaging (apical four-chamber
view) demonstrating normal cardiac chamber dimensions and
intracardiac flow with mild aortic sinus widening and no
pericardial effusion. Lower panel: Pulsed-wave Doppler tracing
confirms preserved left ventricular diastolic function.

Figure 5

Transthoracic echocardiogram of the
proband's mother. This grayscale two-dimensional echocardiogram
(parasternal long-axis view) demonstrates normal cardiac chamber
dimensions with reduced early diastolic relaxation function of both
the left and right ventricles, consistent with subclinical
myocardial dysfunction. No pericardial effusions or significant
valvular abnormalities were observed.
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Copy and paste a formatted citation
Spandidos Publications style
Zhu Y, Wang Q and Zhang T: <em>LMNA</em> c.1622G&gt;A mutation and myopathic changes in a family with limb‑girdle muscular dystrophy: A case report. Exp Ther Med 32: 202, 2026.
APA
Zhu, Y., Wang, Q., & Zhang, T. (2026). <em>LMNA</em> c.1622G&gt;A mutation and myopathic changes in a family with limb‑girdle muscular dystrophy: A case report. Experimental and Therapeutic Medicine, 32, 202. https://doi.org/10.3892/etm.2026.13198
MLA
Zhu, Y., Wang, Q., Zhang, T."<em>LMNA</em> c.1622G&gt;A mutation and myopathic changes in a family with limb‑girdle muscular dystrophy: A case report". Experimental and Therapeutic Medicine 32.2 (2026): 202.
Chicago
Zhu, Y., Wang, Q., Zhang, T."<em>LMNA</em> c.1622G&gt;A mutation and myopathic changes in a family with limb‑girdle muscular dystrophy: A case report". Experimental and Therapeutic Medicine 32, no. 2 (2026): 202. https://doi.org/10.3892/etm.2026.13198
Copy and paste a formatted citation
x
Spandidos Publications style
Zhu Y, Wang Q and Zhang T: <em>LMNA</em> c.1622G&gt;A mutation and myopathic changes in a family with limb‑girdle muscular dystrophy: A case report. Exp Ther Med 32: 202, 2026.
APA
Zhu, Y., Wang, Q., & Zhang, T. (2026). <em>LMNA</em> c.1622G&gt;A mutation and myopathic changes in a family with limb‑girdle muscular dystrophy: A case report. Experimental and Therapeutic Medicine, 32, 202. https://doi.org/10.3892/etm.2026.13198
MLA
Zhu, Y., Wang, Q., Zhang, T."<em>LMNA</em> c.1622G&gt;A mutation and myopathic changes in a family with limb‑girdle muscular dystrophy: A case report". Experimental and Therapeutic Medicine 32.2 (2026): 202.
Chicago
Zhu, Y., Wang, Q., Zhang, T."<em>LMNA</em> c.1622G&gt;A mutation and myopathic changes in a family with limb‑girdle muscular dystrophy: A case report". Experimental and Therapeutic Medicine 32, no. 2 (2026): 202. https://doi.org/10.3892/etm.2026.13198
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