PMC Exostosis and Related Disorders Panel

Up to 3 genes Turn around Time: 10 business days
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Test Description

The Exostosis and Related Disorders Panel is designed to detect genetic changes linked to conditions that cause abnormal bone growth. These disorders are often marked by the development of benign bony outgrowths that can affect mobility, cause discomfort, or lead to other complications depending on their size and location. This panel helps identify the genetic basis of these conditions, supporting accurate diagnosis, clinical decision-making, and family risk assessment.

  • Associated Conditions
    • Acrofacial dysostosis 1, Nager
    • Acrofacial dysostosis, Cincinnati type
    • Cornelia de Lange syndrome
    • Craniofrontonasal dysplasia
    • Craniosynostosis
    • Dyssegmental dysplasia Rolland-Desbuquis type
    • Dyssegmental dysplasia Silverman-Handmaker type
  • 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