Skeletal ciliopathies
Gene: IQCE
The rating of this gene has been updated following NHS Genomic Medicine Service approval.Created: 6 Mar 2022, 4:57 p.m. | Last Modified: 6 Mar 2022, 4:57 p.m.
Panel Version: 1.17
Comment on list classification: Promoting from red to amber, but with recommendation of promoting to green following GMS review. 4 cases now reported.Created: 18 Jan 2021, 4:05 p.m. | Last Modified: 18 Jan 2021, 4:05 p.m.
Panel Version: 1.7
Green Expert Review of this gene on the Limb disorders panel.
PMID: 28488682 Umair et al 2017 report a large consanguineous family of Pakistani origin segregating post-axial polydactyly type A in the feet. A homozygous splice acceptor site variant (c.395-1G>A) was identified by WES in the IQCE gene, which completely co-segregated with the phenotype in the family. They report that the Iqce knockout mouse (MGI:1921489) shows various types of skeletal deformities including pre-axial polydactyly, digit abnormalities, and short and long tibia.
PMID: 31549751 - Estrada-Cuzcano et al 2019 - report 3 families with biallelic pathogenic variations in IQCE identified by WES. The same variant c.895_904del (p.Val301Serfs*8) was found in all families without sharing a common haplotype, suggesting a recurrent mechanism. In one family this variant as compound heterozygous with another IQCE variant p.Glu451Argfs*15. These families with post-axial polydactyly were initially recruited as syndromic ciliopathies and two have additional pathogenic variations in other genes (TULP1 and ATP6V1B1) explaining their apparent syndromic phenotype. Functional studies based on the patient's cells or zebrafish (Danio rerio) assays confirm the ciliary role of IQCE.
Sources: LiteratureCreated: 18 Jan 2021, 4:04 p.m.
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Polydactyly, postaxial, type A7 OMIM:617642; polydactyly, postaxial, type a7 MONDO:0060550
Publications
Tag for-review was removed from gene: IQCE.
Source Expert Review Green was added to IQCE. Rating Changed from Amber List (moderate evidence) to Green List (high evidence)
Tag for-review tag was added to gene: IQCE.
Gene: iqce has been classified as Amber List (Moderate Evidence).
gene: IQCE was added gene: IQCE was added to Skeletal ciliopathies. Sources: Literature Mode of inheritance for gene: IQCE was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: IQCE were set to 28488682; 31549751 Phenotypes for gene: IQCE were set to Polydactyly, postaxial, type A7 OMIM:617642; polydactyly, postaxial, type a7 MONDO:0060550 Review for gene: IQCE was set to GREEN