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Prepair 1000+

Gene: GJA1

Green List (high evidence)

GJA1 (gap junction protein alpha 1)
EnsemblGeneIds (GRCh38): ENSG00000152661
EnsemblGeneIds (GRCh37): ENSG00000152661
OMIM: 121014, Gene2Phenotype
GJA1 is in 20 panels

1 review

Michelle Torres (Victorian Clinical Genetics Services)

Green List (high evidence)

The GJA1 gene is associated with both AD & AR conditions (OMIM).

For carrier screening testing, the only relevant conditions are the AR disorders: Craniometaphyseal dysplasia MIM#218400; Oculodentodigital dysplasia MIM#257850.

Craniometaphyseal dysplasia (CMD) is a rare sclerosing skeletal disorder with progressive hyperostosis of craniofacial bones. Characteristic ocular and dental features of ODDD as well as syndactyly are absent in patients with CMD (PMID: 23951358). Reports are rare and individuals are homozygous for the p.(Arg239Gln), located in the C-terminus of the GJA1 gene; at least 4x families reported (PMID: 23951358).

Oculodentodigital dysplasia (ODDD) is a rare condition characterised by a typical facial appearance and variable findings of the eyes, teeth, and fingers (PMID: 29902798). ODDD is generally AD (DN and GoF suggested), but rare AR cases have been identified. LoF is associated with AR ODDD (PMID: 29902798), and most variants reported are PTV within the connexin domain (PMID: 34035645).

NB: the association with Hypoplastic left heart syndrome 1, MIM#241550 isn't listed in OMIM anymore, variants associated have been re-classified VUS (OMIM; PMID 38884762).
Created: 9 Jan 2025, 2:51 a.m. | Last Modified: 23 Jan 2025, 1:35 a.m.
Panel Version: 1.1268

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Craniometaphyseal dysplasia, autosomal recessive MIM#218400; Oculodentodigital dysplasia, autosomal recessive MIM#257850

Publications

History Filter Activity

16 Jan 2025, Gel status: 3

Entity classified by Genomics England curator

Zornitza Stark (Victorian Clinical Genetics Services; Australian Genomics)

Gene: gja1 has been classified as Green List (High Evidence).

16 Jan 2025, Gel status: 3

Set Phenotypes

Zornitza Stark (Victorian Clinical Genetics Services; Australian Genomics)

Phenotypes for gene: GJA1 were changed from Hypoplastic left heart syndrome 1, 241550 (3) to Craniometaphyseal dysplasia, autosomal recessive MIM#218400; Oculodentodigital dysplasia, autosomal recessive MIM#257850

16 Jan 2025, Gel status: 3

Set publications

Zornitza Stark (Victorian Clinical Genetics Services; Australian Genomics)

Publications for gene: GJA1 were set to

1 Jun 2022, Gel status: 3

Created, Added New Source, Set mode of inheritance, Set Phenotypes

Zornitza Stark (Victorian Clinical Genetics Services; Australian Genomics)

gene: GJA1 was added gene: GJA1 was added to Reproductive Carrier Screen_VCGS. Sources: Mackenzie's Mission,Expert Review Green Mode of inheritance for gene: GJA1 was set to BIALLELIC, autosomal or pseudoautosomal Phenotypes for gene: GJA1 were set to Hypoplastic left heart syndrome 1, 241550 (3)