Abstract
Background and aims
Some hereditary transthyretin (ATTRv) amyloidosis patients are misdiagnosed as Charcot−Marie−Tooth disease (CMT) at onset. We assess the findings to identify ATTRv amyloidosis among patients with suspected CMT to screen transthyretin gene variants for treatments.
Methods
We assessed clinical, cerebrospinal fluid, and electrophysiological findings by comparing ATTRv amyloidosis patients with suspected CMT (n = 10) and CMT patients (n = 489).
Results
The median (interquartile range) age at onset of neurological symptoms was 69 (64.2–70) years in the ATTRv amyloidosis vs 12 (5–37.2) years in CMT group (Mann−Whitney U, p < 0.01).
The proportion of patients with initial sensory symptoms was 70% in the ATTRv amyloidosis group vs 7.1% in CMT group (Fisher’s exact, p < 0.01). The proportion of patients with histories of suspected chronic inflammatory demyelinating polyneuropathy (CIDP) were 50% in the ATTRv amyloidosis group vs 8.7% in CMT group (Fisher’s exact, p < .01). Other measures and outcomes were not different between the two groups. Five of the six patients with ATTRv amyloidosis received treatment and survived.
Interpretation
For effective treatments, the transthyretin gene should be screened in patients with suspected CMT with old age at onset of neurological symptoms, initial sensory symptoms, and histories of suspected CIDP.
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Acknowledgements
The authors appreciate Tomoko Ohnishi for her great technical assistance. The authors are supported by Enago (www.enago.jp) for reviewing the English in this report. We appreciate the Joint Research Laboratory, at the Kagoshima University Graduate School of Medicine and Dental Sciences, for the use of their facilities.
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All authors contributed to acquisition of patients’ data, analysis or interpretation of data, drafting or revising of the manuscript. MA, YH, YO and HT contributed to study conception and supervision.
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HT has been funded by Grants-in-Aid from the Research Committee of Ataxia, Health Labour Sciences Research Grant, the Ministry of Health, Labour and Welfare, Japan (201610002B), Japan Agency for Medical Research and Development (AMED) and Japan Society for the Promotion of Science (JSPS). YH and MA have been funded by Japan Society for the Promotion of Science (JSPS). Grant numbers of AMED are 201442014A, 201442071A, 17929553, and those of JSPS are JP18H02742, JP20K16604, JP21K15702, JP21H02842.
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Taniguchi, T., Ando, M., Okamoto, Y. et al. Elderly patients with suspected Charcot-Marie-Tooth disease should be tested for the TTR gene for effective treatments. J Hum Genet 67, 353–362 (2022). https://doi.org/10.1038/s10038-021-01005-w
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DOI: https://doi.org/10.1038/s10038-021-01005-w
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