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Intellectual disability syndromic and non-syndromic

Gene: PIGQ

Green List (high evidence)

PIGQ (phosphatidylinositol glycan anchor biosynthesis class Q)
EnsemblGeneIds (GRCh38): ENSG00000007541
EnsemblGeneIds (GRCh37): ENSG00000007541
OMIM: 605754, Gene2Phenotype
PIGQ is in 3 panels

1 review

Konstantinos Varvagiannis (Other)

Green List (high evidence)

Homozygous or compound heterozygous mutations in PIGQ cause Epileptic encephalopathy, early infantile, 77 (MIM #618548).

Johnstone et al (2020 - PMID: 32588908) describe the phenotype of 7 children (from 6 families) with biallelic PIGQ pathogenic variants. The authors also review the phenotype of 3 subjects previously reported in the literature (by Martin et al, Alazami et al, Starr et al - respective PMIDs: 24463883, 25558065, 31148362).

Affected individuals displayed severe to profound global DD/ID and seizures with onset in the first year of life. There were variable other features incl. - among others - genitourinary, cardiac, skeletal, ophthalmological anomalies, gastrointestinal issues. Within the cohort there was significant morbidity/mortality.

PIGQ encodes phosphatidylinositol glycan anchor biosynthesis class Q protein, playing a role (early) in the biosynthesis of the GPI-anchor. Several genes in the GPI biosynthesis pathway cause multi-system disease with DD/ID and seizures. Flow cytometry has been used in individuals with PIGQ-related disorder. Serum ALP was elevated in some (4) although - as the authors comment - elevations are more typical in disorders affecting later steps of GPI biosynthesis.

More than 10 variants have been reported to date (missense / pLoF).

Overall PIGQ can be considered for green rating in both ID and epilepsy gene panels.
Sources: Literature
Created: 3 Aug 2020, 10:36 p.m.

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Epileptic encephalopathy, early infantile, 77 (MIM #618548)

Publications

Details

Mode of Inheritance
BIALLELIC, autosomal or pseudoautosomal
Sources
  • Expert Review Green
Phenotypes
  • Epileptic encephalopathy, early infantile, 77 (MIM #618548)
OMIM
605754
Clinvar variants
Variants in PIGQ
Penetrance
Complete
Publications
Panels with this gene

History Filter Activity

4 Aug 2020, Gel status: 3

Entity classified by Genomics England curator

Zornitza Stark (Victorian Clinical Genetics Services; Australian Genomics)

Gene: pigq has been classified as Green List (High Evidence).

4 Aug 2020, Gel status: 3

Entity classified by Genomics England curator

Zornitza Stark (Victorian Clinical Genetics Services; Australian Genomics)

Gene: pigq has been classified as Green List (High Evidence).

3 Aug 2020, Gel status: 0

Created, Added New Source, Set mode of inheritance, Set publications, Set Phenotypes, Set penetrance

Konstantinos Varvagiannis (Other)

gene: PIGQ was added gene: PIGQ was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: PIGQ was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PIGQ were set to 32588908; 24463883; 25558065; 31148362 Phenotypes for gene: PIGQ were set to Epileptic encephalopathy, early infantile, 77 (MIM #618548) Penetrance for gene: PIGQ were set to Complete Review for gene: PIGQ was set to GREEN