PMC Achromatopsia Panel

Up to 8 genes Turn around Time: 10 business days
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Test Description

The Achromatopsia Panel examines genes linked to achromatopsia, a condition characterized by poor vision, sensitivity to light, involuntary eye movements, and difficulty perceiving color. These specific genes were chosen based on current scientific information in order to provide a comprehensive analysis for hereditary achromatopsia. Due to the genetic diversity associated with these disorders, relying solely on physical symptoms can be challenging in pinpointing a definitive cause. Therefore, a broad panel test offers a thorough assessment of multiple potential genes based on a single clinical indication. Testing these genes genetically may validate a diagnosis and assist in determining treatment and management strategies. Identifying a variant responsible for the disease can aid in assessing the risk of recurrence and offering genetic counseling. It is important to note that some genes included in this test may be linked to other conditions not covered by this specific panel.

  • Associated Conditions
    • Achromatopsia
    • Bradyopsia
    • Cone dystrophy
    • Leber congenital amaurosis
    • Macular degeneration, juvenile
    • Retinal cone dystrophy
  • 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:

    8 genes selected