Glycogen storage disease type I diagnostic study of choice: Difference between revisions

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===Molecular genetic testing===
===Molecular genetic testing===
*Molecular genetic testing shows:
*Molecular genetic testing shows:<ref>Bali DS, Chen YT, Austin S, et al. Glycogen Storage Disease Type I. 2006 Apr 19 [Updated 2016 Aug 25]. In: Adam MP, Ardinger HH, Pagon RA, et al., editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2017. Available from: https://www.ncbi.nlm.nih.gov/books/NBK1312/
</ref>
**Biallelic pathogenic variants in G6PC for patients with GSD type 1a
**Biallelic pathogenic variants in G6PC for patients with GSD type 1a
**Biallelic pathogenic variants in SLC37A4 for patients with GSD type 1b
**Biallelic pathogenic variants in SLC37A4 for patients with GSD type 1b
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| style="background:#DCDCDC;" align="center" + |Genome sequencing
| style="background:#DCDCDC;" align="center" + |Genome sequencing
|}
|}
===Enzyme Activity Assay===


==References==
==References==
{{reflist|2}}
{{reflist|2}}

Revision as of 17:21, 20 November 2017

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief:

Overview

Diagnostic Study of Choice

GSD type 1 is diagnosed by identification of proband by either of the following:[1]

  • Molecular genetic testing
  • Enzyme Activity Assay

Molecular genetic testing

  • Molecular genetic testing shows:[2]
    • Biallelic pathogenic variants in G6PC for patients with GSD type 1a
    • Biallelic pathogenic variants in SLC37A4 for patients with GSD type 1b
Molecular genetic testing
Genetic testing Analysis performed
Serial single-gene testing
  • First sequence analysis of G6PC is done
  • sequence analysis of SLC37A4 if no G6PC pathogenic variants identified
Targeted analysis
  • For G6PC pathogenic variant
    • Ashkenazi Jewish ancestry[3]
      • p.Arg83Cys analysis
  • For G6PD pathogenic variant
    • Old Order Amish ancestry
      • p.Gln347Ter analysis
Multigene panel
  • Multiple genes are sequenced at the same time including G6PC, SLC37A4 and other related genes when differential diagnosis is considered
Comprehensive genomic testing Exome sequencing
  • Considered if the diagnosis is not confirmed by serial single-gene testing and/or use of a multigene panel in an individual with features of GSDI
Genome sequencing


Enzyme Activity Assay

References

  1. Bali DS, Chen YT, Austin S, et al. Glycogen Storage Disease Type I. 2006 Apr 19 [Updated 2016 Aug 25]. In: Adam MP, Ardinger HH, Pagon RA, et al., editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2017. Available from: https://www.ncbi.nlm.nih.gov/books/NBK1312/
  2. Bali DS, Chen YT, Austin S, et al. Glycogen Storage Disease Type I. 2006 Apr 19 [Updated 2016 Aug 25]. In: Adam MP, Ardinger HH, Pagon RA, et al., editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2017. Available from: https://www.ncbi.nlm.nih.gov/books/NBK1312/
  3. Ekstein J, Rubin BY, Anderson SL, Weinstein DA, Bach G, Abeliovich D; et al. (2004). "Mutation frequencies for glycogen storage disease Ia in the Ashkenazi Jewish population". Am J Med Genet A. 129A (2): 162–4. doi:10.1002/ajmg.a.30232. PMID 15316959.