Primary immunodeficiencyGene: PI4KA
There is enough evidence to support a gene-disease association. This gene should be rated Green at the next review.
Review by Sophie Hambleton (Newcastle University):
"The immunological abnormalities in PI4KA def are obviously rather variable and a slight side-show to the primary GI and neurologic pathology – however that is a detail that should come out when any putative case is reviewed in detail so I would include this as a “CID with associated or syndromic features” on the same basis as TTC7A"
Created: 1 Nov 2021, 8:18 a.m. | Last Modified: 1 Nov 2021, 8:18 a.m.
Panel Version: 2.481
This gene is associated with a relevant phenotype in OMIM and Gene2Phenotype.
PMID: 25855803. From OMIM: "3 fetuses were all diagnosed in utero with multiple congenital anomalies resulting in the termination of pregnancy between 16 and 34 weeks' gestation. All fetuses had bilateral perisylvian polymicrogyria and cerebellar hypoplasia or dysplasia. One had a small pons. Additional features included severe talipes equinovarus, externally rotated hips, and variable contractures of the limbs or fingers."
PMID:34415322. 10 patients from 10 unrelated families with biallelic varaints in PI4KA. Patients showed a spectrum of severe global neurodevelopmental delay (8/10 moderate to severe ID), hypomyelination, cerebellar hyoplasia (1/10), cerebellar atrophy (5/10), bilateral perisylvian polymicrogyria (1/10), immunological problems (hypogammaglobulinaemia, lymphopaenia, and autoimmune neutorpaenia - 4/10), bowl dysfunction (4/10). Age of onset ranged from newborn to 17 years.
PMID: 34415310. 7 unrelated families. Family 1: Amish. Severe extensive multiple intestinal atresia, IBD and combined immunodeficiency (2/4). Families 3 - 8 all have 1 affected individual, (Turkish, Indian, German and Italian). Global developmental delay (all), ID (severe to mild), cerebellar and/or brainstem anomalies (3/6), spasticity (all), immature gyral pattern (1/6), leukodystrophy (6/6), multiple intestinal atresia (0/6), IBD (3/6), combined immunodeficiency (2/6). Early age of onset.
Created: 1 Sep 2021, 1:47 p.m. | Last Modified: 1 Sep 2021, 1:47 p.m.
Panel Version: 2.230
gene: PI4KA was added gene: PI4KA was added to Primary immunodeficiency. Sources: Expert Review Amber Q3_21_rating tags were added to gene: PI4KA. Mode of inheritance for gene: PI4KA was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PI4KA were set to 25855803; 34415322; 34415310 Phenotypes for gene: PI4KA were set to Polymicrogyria, perisylvian, with cerebellar hypoplasia and arthrogryposis, OMIM:616531