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| Intellectual disability - microarray and sequencing v4.25 | DCX | Arina Puzriakova Phenotypes for gene: DCX were changed from Lissencephaly, X-linked, 300067Subcortical laminal heteropia, X-linked, 300067; SUBCORTICAL BAND HETEROTOPIA X-LINKED (SBHX) to Lissencephaly, X-linked, OMIM:300067; Subcortical laminal heterotopia, X-linked, OMIM:300067 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v2.588 | CTNNA2 |
Konstantinos Varvagiannis gene: CTNNA2 was added gene: CTNNA2 was added to Intellectual disability. Sources: Literature Mode of inheritance for gene: CTNNA2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: CTNNA2 were set to 30013181 Phenotypes for gene: CTNNA2 were set to Cortical dysplasia, complex, with other brain malformations 9 (MIM 618174) Penetrance for gene: CTNNA2 were set to Complete Review for gene: CTNNA2 was set to AMBER Added comment: Biallelic loss-of-function mutations in CTNNA2 cause cortical dysplasia, complex, with other brain malformations 9 (MIM 618174). ------- Schaffer et al. (PMID: 30013181) report on 7 individuals from 3 unrelated consanguineous families. All individuals presented with profoundly impaired motor and cognitive development (severe ID in 6/7 for whom this information was available, all 6 from 2 families - a further individual from the 3rd family was non-ambulatory with absent speech at the age of 28 months), with acquired microcephaly and intractable seizures (7/7 - onset: 6m-3y - atonic/myoclonic/infantile spasms). Pachygyria without posterior-anterior gradient or focal dysplasias was common to all. CTNNA2 encodes αN-catenin. It is expressed in human fetal brain, mainly in regions expressing migration markers DCX and TUJ1. Reduced migration was shown for iPSC-derived neural progenitor cells from an affected individual, compared to controls. The protein contains a putative actin-binding domain (ABD) at its C terminus. Several lines of evidence are provided that this domain is critical for the process of neuronal migration. ------- CTNNA2 is included in the DD panel of G2P associated with disordered cortical neuronal migration (Disease confidence: probable / ID and seizures among the phenotypes assigned to this entry). This gene is not commonly included in gene panels for intellectual disability. ------- As a result CTNNA2 could be considered for inclusion in this panel as amber or possibly green. Sources: Literature |
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| Intellectual disability - microarray and sequencing v2.468 | DCX | Louise Daugherty Source Victorian Clinical Genetics Services was added to DCX. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | DCX | BRIDGE consortium edited their review of DCX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | DCX | BRIDGE consortium edited their review of DCX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | DCX | BRIDGE consortium reviewed DCX | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||