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Intellectual disability

Gene: ZIC1

Amber List (moderate evidence)

ZIC1 (Zic family member 1)
EnsemblGeneIds (GRCh38): ENSG00000152977
EnsemblGeneIds (GRCh37): ENSG00000152977
OMIM: 600470, Gene2Phenotype
ZIC1 is in 6 panels

3 reviews

Zornitza Stark (Australian Genomics)

Green List (high evidence)

5 families with heterozygous mutations located in the final (third) exon of ZIC1 who have a distinct phenotype in which severe craniosynostosis, specifically involving the coronal sutures, and variable learning disability are the most characteristic features. The location of the nonsense mutations predicts escape of mutant ZIC1 transcripts from nonsense-mediated decay, which was confirmed in a cell line from an affected individual. Both nonsense and missense mutations are associated with altered and/or enhanced expression of a target gene, engrailed-2, in a Xenopus embryo assay. Analysis of mouse embryos revealed a localized domain of Zic1 expression at embryonic days 11.5-12.5 in a region overlapping the supraorbital regulatory center, which patterns the coronal suture.

2 sibs with BAIDCS, Vandervore et al. (2018) identified heterozygosity for a frameshift mutation in the ZIC1 gene. Neither parent had evidence of the mutation by whole-exome sequencing, suggesting that gonadal mosaicism for the mutation was present in one of the parents. Expression of the mutated allele was detected in patient fibroblasts by RT-PCR, evidence that the mutant mRNA did not undergo nonsense-mediated decay and probably generates an abnormal protein.
Created: 4 Mar 2020, 1:40 a.m. | Last Modified: 4 Mar 2020, 1:40 a.m.
Panel Version: 3.3

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

Phenotypes
Structural brain anomalies with impaired intellectual development and craniosynostosis, OMIM #618736

Publications

Variants in this GENE are reported as part of current diagnostic practice

BRIDGE consortium (NIHRBR-RD)

Green List (high evidence)

This is a pertinent gene from the NIHR BioResource - Rare Diseases Study (NIHRBR-RD) BRIDGE Study : SPEED (Specialist Pathology: Evaluating Exomes in Diagnostics) which covers epilepsies, movement and microcephaly disorders, this gene is on the SPEED_NEURO_20170705 gene list. Evidences used for SPEED NEURO gene list: in_ddg2p_2_4_2017;in_ddg2p_2_4_2017_conf . Main mutation mechanism : activating
Created: 27 Jul 2017, 8:58 p.m.

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown

Publications

Mode of pathogenicity
Other

Louise Daugherty (Genomics England Curator)

Comment on list classification: This gene is from an expert list and needs further assessment by the Genomics England curation team to access inclusion and pertinence to this panel.
Created: 28 Jul 2017, 5:13 p.m.

Details

Mode of Inheritance
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Sources
  • Expert Review Amber
Phenotypes
  • CRANIOSYNOSTOSIS 6
OMIM
600470
Clinvar variants
Variants in ZIC1
Penetrance
Complete
Mode of Pathogenicity
Other - please provide details in the comments
Panels with this gene

History Filter Activity

12 Mar 2018, Gel status: 2

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.

28 Jul 2017, Gel status: 2

Gene classified by Genomics England curator

Louise Daugherty (Genomics England Curator)

This gene has been classified as Amber List (Moderate Evidence).

27 Jul 2017, Gel status: 0

Created

BRIDGE consortium (NIHRBR-RD)

ZIC1 was created by BRIDGE

27 Jul 2017, Gel status: 0

Added New Source

BRIDGE consortium (NIHRBR-RD)

ZIC1 was added to Intellectual disabilitypanel. Sources: BRIDGE study SPEED NEURO Tier1 Gene