Intellectual disability - microarray and sequencing
Gene: C2CD3Comment on list classification: Despite phenotypic diversity among cases with C2CD3 variants, ID/DD is consistently reported in living patients.
Therefore, this gene could be promoted from Amber to Green at the next GMS panel update (added 'for-review' tag).Created: 13 Oct 2020, 3:03 p.m. | Last Modified: 13 Oct 2020, 3:03 p.m.
Panel Version: 3.435
- PMID: 24997988 (2014) - Two unrelated cases with OFD syndrome and biallelic variants (p.Arg62* and p.Cys1029Gly; p.Ala1304Valfs*3, respectively) in C2CD3. In a 4-year-old male, additional manifestations included severe microcephaly (-5 SD), severe ID, micropenis, and brain malformations including Molar Tooth Sign. In the second patient, a terminated foetus, severe microcephaly (-4 SD) was combined with canonical OFD symptoms, but assessment of ID was not possible. No functional studies of the variants; however, some data supporting a role of C2CD3 in cilium assembly and function.
- PMID: 26092869 (2015) - Two unrelated individuals with biallelic variants in C2CD3. Clinical details are limited but both had features of Joubert syndrome (as JBTS screening study), as well as oral features including oral frenulae and/or cleft palate. No report on ID status, but could possibly be present in view of the JBTS diagnosis. One patient also harboured biallelic variants in TTC21B.
- PMID: 26477546 (2015) - Compound het variants identified in two affected sibs with a classic form of JBTS and severe GDD but without any extraneural manifestations, as described in previous cases.
- PMID: 27094867 (2016) - Two sibling fetuses with skeletal dysplasia, brain malformations but no microcephaly, in association with compound het variants in C2CD3. Due to termination of pregnancies, ID status could not be established. Analysis of patient-derived fibroblasts showed impaired cilium assembly.
- PMID: 30097616 (2018) - Four individuals from three unrelated families with different biallelic variants in C2CD3. Each family exhibited distinct clinical phenotypes and severity of disease:
Family 1: two sibs with a diagnosis of OFD including polydactyly, cleft palate and/or incomplete cleft lip, microcephaly, brain malformations and bilateral colobomas. GDD was noted in both sibs.
Family 2: fetus with encephalocele and a ventricular septal defect. Similar abnormalities were identified in a sib (also a terminated fetus), but DNA analysis was not performed on the latter.
Family 3: one male with various fetal anomalies, and subsequent diagnosis of JBTS following identification of consistent findings on brain MRI. Other features included DD and bilateral retina colobomas.Created: 13 Oct 2020, 2:03 p.m. | Last Modified: 13 Oct 2020, 2:05 p.m.
Panel Version: 3.432
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Orofaciodigital syndrome XIV, 615948; Joubert-related disorder
Publications
Six families reported with bi-allelic variants in this gene and a ciliopathy, ranging in severity, but generally including ID.Created: 29 Jan 2020, 11:01 a.m. | Last Modified: 29 Jan 2020, 11:01 a.m.
Panel Version: 3.0
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
Orofaciodigital syndrome XIV, MIM# 615948
Publications
Variants in this GENE are reported as part of current diagnostic practice
Comment on list classification: Changed rating of gene from Red to Amber. This gene was rated as Amber in v2.467 and incorrectly automatically demoted to Red in v2.468. This was due to a defect in the automatic PanelApp uploading tool where a reference gene list was added as a new Source (Victorian Clinical Genetics Services), and under certain conditions associated to previous sources listed, resulted in the rating of the gene being automatically changed when it should not have been.Created: 29 Sep 2018, 9:26 p.m.
The rating of this gene has been updated following NHS Genomic Medicine Service approval.Created: 9 Mar 2022, 3:40 p.m. | Last Modified: 9 Mar 2022, 3:40 p.m.
Panel Version: 3.1510
Associated with phenotype in OMIM and as a probable G2P. At least 3 variants reported in two cases of orofaciodigital syndrome XIV 615948 (one homozygous, one compound heterozygous). Two additional variants were reported in two sibling fetuses (terminations), with an overall defect in ciliogenesis resulting in a different clinical presentation, dominated by skeletal dysplasia with no microcephaly, clearly intellectual status could not be establishedCreated: 15 Dec 2017, 9:38 a.m.
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Publications
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
OROFACIODIGITAL SYNDROME XIV
Publications
Comment on list classification: 2 families reported to date - awaiting confirmationCreated: 3 Feb 2016, 12:09 p.m.
Tag for-review was removed from gene: C2CD3.
Source Expert Review Green was added to C2CD3. Rating Changed from Amber List (moderate evidence) to Green List (high evidence)
Gene: c2cd3 has been classified as Amber List (Moderate Evidence).
Phenotypes for gene: C2CD3 were changed from ?Orofaciodigital syndrome XIV 615948 to Orofaciodigital syndrome XIV, 615948; Joubert-related disorder
Publications for gene: C2CD3 were set to 27094867; 24997988
Tag for-review tag was added to gene: C2CD3.
Gene: c2cd3 has been classified as Amber List (Moderate Evidence).
Source Victorian Clinical Genetics Services was added to C2CD3.
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.
Expert Review Amber was added to C2CD3. Panel: Intellectual disability Publications for gene C2CD3 was set to ['27094867', ' 24997988']
This gene has been classified as Red List (Low Evidence).
This gene has been classified as Red List (Low Evidence).
The Gel status was updated for this whole panel
The Gel status was updated for this whole panel
C2CD3 was added to Intellectual disabilitypanel. Sources: Expert Review Amber
C2CD3 was created by ellenmcdonagh