Arthrogryposis
Gene: KCNK3
The rating of this gene has been updated to Green and the mode of inheritance set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown following NHS Genomic Medicine Service approval.Created: 10 Oct 2023, 4:08 p.m. | Last Modified: 10 Oct 2023, 4:08 p.m.
Panel Version: 5.15
Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Comment on list classification: Given the number of unrelated cases with a comparable phenotype (including arthrogryposis/flexion contractures/foot deformities), all shown to have variants that cluster near the X-gate and cause increased channel activation, this gene should be promoted to Green status at the next GMS panel update.Created: 16 Dec 2022, 1:05 p.m. | Last Modified: 16 Dec 2022, 2:22 p.m.
Panel Version: 4.2
Heterozygous variant in the KCNK3 gene already have a well-established link with pulmonary arterial hypertension (OMIM:615344).
However, Sormann et al. 2022 (PMID: 36195757) identified nine unrelated individuals harbouring one of six de novo missense variants in KCNK3 who presented with developmental delay and sleep apnea among other variable features (musculoskeletal and limb anomalies, abnormalities of male genitalia/groin and digestive disturbance). The variants were shown to cause defective X-gating leading to overactive channels that no longer respond to inhibition by G-protein-coupled receptor pathways (i.e. GOF), distinct from the PAH mechanism which is caused by LOF variants.
Sources: LiteratureCreated: 16 Dec 2022, 12:18 p.m.
Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Phenotypes
Developmental disorder with sleep apnea
Publications
Mode of pathogenicity
Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments
Tag Q4_22_promote_green was removed from gene: KCNK3.
Source NHS GMS was added to KCNK3. Source Expert Review Green was added to KCNK3. Rating Changed from Amber List (moderate evidence) to Green List (high evidence)
gene: KCNK3 was added gene: KCNK3 was added to Arthrogryposis. Sources: Literature,Expert Review Amber Q4_22_promote_green tags were added to gene: KCNK3. Mode of inheritance for gene: KCNK3 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: KCNK3 were set to 36195757 Phenotypes for gene: KCNK3 were set to Developmental disorder with sleep apnea Mode of pathogenicity for gene: KCNK3 was set to Loss-of-function variants (as defined in pop up message) DO NOT cause this phenotype - please provide details in the comments