CMT – Roma population panel

CMT – Roma population panel

[3 genes]

TOURNAROUND TIME: 6 WEEKS

HK1 NDRG1 SH3TC2
RELATED PHENOTYPES
Hereditary motor and sensory neuropathy, Lom type NDRG1
Hereditary motor and sensory neuropathy, Russe type HK1
  • Charcot-Marie-Tooth (CMT) disease or hereditary motor and sensory neuropathy is the most frequent inherited neuromuscular disease, with a prevalence of 1/2 500 individuals (Suter and Sherer, 2003).

    CMT is a complex disorder at the molecular level, with at least 1 000 genetic variants associated with about 80 genes (Timmerman et al., 2014). In the wide series described, molecular alteration is identified in 60%-70% of patients (80% of demyelinating forms and 25% of axonal forms) (Rossor et al., 2015). Approximately 90% of alterations are found in genes PMP22, MPZ, GJB1, and MFN2 (DiVicenzo et al., 2015), although this number varies among populations and is particularly reduced in regions with a high prevalence of recessive inheritance forms. 40%-50% of CMT cases are type 1 (CMT1, demyelinating form), of which 70-80% are caused by a duplication of a region of about 1.5 Mb in 17p12 containing the PMP22 gene (CMT1A).

    Hereditary motor neuropathy (HMN) comprises 10% of all hereditary neuropathies, with a diagnosis rate of 20%-32% (Bansagi et al., 2017).

    REFERENCES
    1. Bansagi B, Griffin H, Whittaker RG, Antoniadi T, Evangelista T, Miller J, Greenslade M, Forester N, Duff J, Bradshaw A, Kleinle S, Boczonadi V, Steele H, Ramesh V, Franko E, Pyle A, Lochmüller H, Chinnery PF, Horvath R. Genetic heterogeneity of motor neuropathies. Neurology. 2017 Mar 28;88(13):1226-1234.
    2. DiVincenzo C, Elzinga CD, Medeiros AC, Karbassi I, Jones JR, Evans MC, Braastad CD, Bishop CM, Jaremko M, Wang Z, Liaquat K, Hoffman CA, York MD, Batish SD, Lupski JR, Higgins JJ. The allelic spectrum of Charcot-Marie-Tooth disease in over 17,000 individuals with neuropathy. Mol Genet Genomic Med. 2014 Nov;2(6):522-9.
    3. Rossor AM, Evans MR, Reilly MM. A practical approach to the genetic neuropathies. Pract Neurol. 2015 Jun;15(3):187-98.
    4. Suter U, Scherer SS. Disease mechanisms in inherited neuropathies. Nat Rev Neurosci. 2003 Sep;4(9):714-26. Review. PubMed PMID: 12951564.
    5. Timmerman V, Strickland AV, Züchner S. Genetics of Charcot-Marie-Tooth (CMT) Disease within the Frame of the Human Genome Project Success. Genes (Basel). 2014 Jan 22;5(1):13-32.

 

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VARIANT CLASSIFICATION
Variant classification and clinical usefulness criteria

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