Genes in panel
Regions in panel
Prev Next

Intellectual disability

Gene: PIGQ

Red List (low evidence)

PIGQ (phosphatidylinositol glycan anchor biosynthesis class Q)
EnsemblGeneIds (GRCh38): ENSG00000007541
EnsemblGeneIds (GRCh37): ENSG00000007541
OMIM: 605754, Gene2Phenotype
PIGQ is in 4 panels

4 reviews

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.
Created: 3 Aug 2020, 10:37 p.m. | Last Modified: 3 Aug 2020, 10:37 p.m.
Panel Version: 3.226

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

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

Publications

Louise Daugherty (Genomics England Curator)

Red List (low evidence)

There is currently no evidence to suggest there is an association of this gene with intellectual disability.
Created: 18 Dec 2017, 3:39 p.m.

Caroline Wright (Sanger)

Red List (low evidence)

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
SEVERE EARLY-ONSET EPILEPSY

Publications

Lu Raymond (university of cambridge )

Red List (low evidence)

Details

Mode of Inheritance
BIALLELIC, autosomal or pseudoautosomal
Sources
  • Expert Review Red
Phenotypes
  • SEVERE EARLY-ONSET EPILEPSY
  • Epileptic encephalopathy, early infantile, 77, 618548
OMIM
605754
Clinvar variants
Variants in PIGQ
Penetrance
Complete
Publications
Panels with this gene

History Filter Activity

3 Oct 2019, Gel status: 1

Set Phenotypes

Rebecca Foulger (Genomics England curator)

Phenotypes for gene: PIGQ were changed from SEVERE EARLY-ONSET EPILEPSY to SEVERE EARLY-ONSET EPILEPSY; Epileptic encephalopathy, early infantile, 77, 618548

12 Mar 2018, Gel status: 1

Panel promoted to version 2.0

Ellen McDonagh (Genomics England Curator)

12.03.2018: Due to major updates completed (Phase 1, 2 and 3), this panel was promoted to Version 2 in order to reflect the major updates since November 2017 which have resulted in reviews for 836 genes added by Genomics England Curators and the Clinical Team, 130 new Green genes added to the interpretation pipeline (from 751 to 881 Green genes), and the gene total has increased from 1879 to 1927.

13 Nov 2015, Gel status: 1

gel status update

GEL ()

The Gel status was updated for this whole panel

13 Nov 2015, Gel status: 2

gel status update

GEL ()

The Gel status was updated for this whole panel

13 Nov 2015, Gel status: 0

Created

Ellen McDonagh (Genomics England Curator)

PIGQ was created by ellenmcdonagh

13 Nov 2015, Gel status: 0

Added New Source

Ellen McDonagh (Genomics England Curator)

PIGQ was added to Intellectual disabilitypanel. Sources: Expert Review Red