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| Intellectual disability - microarray and sequencing v3.1511 | SPTBN4 | Arina Puzriakova Tag for-review was removed from gene: SPTBN4. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v3.1510 | SPTBN4 | Sarah Leigh commented on gene: SPTBN4 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v3.1509 | SPTBN4 |
Arina Puzriakova Source Expert Review Green was added to SPTBN4. Rating Changed from Amber List (moderate evidence) to Green List (high evidence) |
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| Intellectual disability - microarray and sequencing v3.510 | SPTBN4 | Arina Puzriakova commented on gene: SPTBN4: Review by Helen Brittain (Genomics England Clinical Team): the phenotype is characterised by marked hypotonia in infancy and developmental delay / ID. Adding as Green to the ID panel would therefore cover both of these GMS indications (as the Hypotonic Infant super panel has the ID panel as a sub-panel). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v3.378 | SPTBN4 | Arina Puzriakova Classified gene: SPTBN4 as Amber List (moderate evidence) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v3.378 | SPTBN4 |
Arina Puzriakova Added comment: Comment on list classification: There is sufficient evidence to rate this gene Green at the next GMS panel update. Severe-to-profound DD and/or ID reported in all but one family with a milder phenotype (at least 9 total families described with different biallelic variants in SPTBN4). |
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| Intellectual disability - microarray and sequencing v3.378 | SPTBN4 | Arina Puzriakova Gene: sptbn4 has been classified as Amber List (Moderate Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v3.377 | SPTBN4 | Arina Puzriakova Tag for-review tag was added to gene: SPTBN4. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v3.314 | SPTBN4 | Konstantinos Varvagiannis edited their review of gene: SPTBN4: Added comment: ** Consider also the GeneReview on this disorder - PMID : 32672909; Changed publications: 28540413, 28940097, 29861105, 31230720, 31857255, 32672909 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v3.35 | SPTBN4 |
Konstantinos Varvagiannis gene: SPTBN4 was added gene: SPTBN4 was added to Intellectual disability. Sources: Literature Mode of inheritance for gene: SPTBN4 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SPTBN4 were set to 28540413; 28940097; 29861105; 31230720; 31857255 Phenotypes for gene: SPTBN4 were set to Neurodevelopmental disorder with hypotonia, neuropathy, and deafness MIM#617519 Penetrance for gene: SPTBN4 were set to Complete Review for gene: SPTBN4 was set to GREEN Added comment: Biallelic pathogenic SPTBN4 variants cause Neurodevelopmental disorder with hypotonia, neuropathy, and deafness (MIM #617519). There are several reports on the phenotype of relevant affected individuals with severe/profound DD/ID in at least 9 individuals : - Knierim et al (2017 - PMID: 28540413) [1 affected individual] - Anazi et al (2017 - PMID: 28940097) [1] - Wang et al (2018 - PMID: 29861105) [6] - Pehlivan et al (2019 - PMID: 31230720) [1] A recent article by Häusler et al (2019 - PMID: 31857255) describes the phenotype of 2 sibs, both presenting with motor and speech delay, although the older one had reportedly 'normal' cognitive performance allowing attendance of regular school at the age of 6 years. Features include congenital hypotonia, severe DD and ID (in most as outlined above, ID was the primary indication for testing on several occasions), poor or absent reflexes and weakness secondary to axonal motor neuropathy, feeding and respiratory difficulties, hearing and visual impairment. Seizures have been reported in at least 4 unrelated individuals (3 by Wang et al / 1 by Pehlivan et al). Variants in most cases were nonsense/frameshift although biallelic missense variants have also been reported. Sibs in the report by Häusler et al harbored a homozygous splicing variant. SPTBN4 encodes a member of the beta-spectrin protein family that is expressed in the brain, peripheral nervous system, pancreas, and skeletal muscle. βIV spectrin links ankyrinG and clustered ion channels (at axon initial segments and nodes of Ranvier) to the axonal cytoskeleton. Pathogenic variants are proposed to disrupt the cytoskeletal machinery controlling proper localization of ion channels and function of axonal domains where ion channels are normally clustered in high density. Among the evidence provided : nerve biopsies from an affected individual displayed reduced nodal Na+ channels and no nodal KCNQ2 K+ channels / Loss of AnkyrinG and βIV spectrin in animal model resulted in loss of KCNQ2- and KCNQ3- subunit containing K+ channels. Apart from the ID / epilepsy panels please consider inclusion in other relevant ones. Sources: Literature |
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