PMC Familial Hemiplegic Migraine Panel

Up to 7 genes Turn around Time: 10 business days
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Test Description

PMC Familial Hemiplegic Migraine Panel examines genes linked to familial hemiplegic migraine (FHM)| alternating hemiplegia of childhood (AHC)| and related conditions. Due to overlapping clinical features of hereditary susceptibility conditions| utilizing a comprehensive panel test enables a thorough evaluation of potential genes for individuals with similar clinical symptoms. Some genes included in this panel may also be associated with conditions unrelated to the clinical indication for testing.

Genetic testing can help with establishing accurate diagnosis| targeted treatment| prognosis prediction| family planning and preventive measures.

  • Associated Conditions
    • dystonia 12 (DYT12), cerebellar ataxia, areflexia, pes cavus, optic atrophy and sensorineural hearing loss (CAPOS) syndrome, alternating hemiplegia of childhood type 2 (AHC2)
    • episodic ataxia type 2 (EA2), familial hemiplegic migraine type 1 (FHM1)
    • episodic ataxia type 6 (EA6)
    • episodic kinesigenic dyskinesia 1 (EKD1), benign familial infantile seizures 2 (BFIS2), familial infantile convulsions with paroxysmal choreoathetosis (ICCA)
    • familial hemiplegic migraine 3 (FHM3)
    • familial hemiplegic migraine type 2 (FHM2), alternating hemiplegia of childhood type 1 (AHC1)
    • glucose transporter type 1 deficiency syndrome (Glut1 DS)
  • Methodology

    Targeted Exome/ Slice Exome (Next Generation Sequencing including Copy Number Variation)

  • Limitations

    All sequencing technologies have limitations. A negative result from this analysis does not rule out a possible genetic diagnosis as some variants may not be detected by this test. This test is not designed to detect low level mosaicism, structural rearrangements, indels >40bp, deep intronic variants of unknown clinical significance, or large cytogenetic CNVs. Certain inherent qualities of the human genome, for example repetitive regions/homopolymers, GC rich, pseudogenes, and rare polymorphisms, pose significant technical challenges such as sequence misalignment that may potentially impact the accuracy of the results. False negative results may also occur in the setting of allogeneic bone marrow, stem cell transplantation, active or chronic hematologic conditions, recent blood transfusions, suboptimal DNA quality or PCR trace contamination. Other potential sources of error include sample mix-ups and clerical issues.

  • References
    • 1. Richards S et al. Genetics in medicine. Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology. 2015 May;17(5):405-24 (PMID: 25741868)
    • 2. GnomAD (gnomAD)
    • 3. CSPEC (ClinGen variant classification rules registry) Criteria Specification Registry
    • 4. Normal copy number variation in healthy individuals database of genomic variants: http://dgv.tcag.ca/dgv/app/home
  • Tagged Genes

    Primary panel:

    7 genes selected