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| Intellectual disability - microarray and sequencing v5.294 | IQSEC2 | Arina Puzriakova Phenotypes for gene: IQSEC2 were changed from Mental retardation, X-linked 1, 309530; non-syndromic X-linked intellectual disability; Rett like phenotype in males; MENTAL RETARDATION X-LINKED TYPE 1 (MRX1) to Intellectual developmental disorder, X-linked 1, OMIM:309530 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.293 | IQSEC2 | Arina Puzriakova Tag Q2_23_MOI was removed from gene: IQSEC2. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.286 | IQSEC2 | Arina Puzriakova reviewed gene: IQSEC2: Rating: ; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.286 | IQSEC2 |
Arina Puzriakova Source NHS GMS was added to IQSEC2. Mode of inheritance for gene IQSEC2 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) |
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| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 |
Achchuthan Shanmugasundram Added comment: Comment on mode of inheritance: There is sufficient evidence (>3 female cases with monoallelic variants causing ID) to suggest that MOI should be updated to 'X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)' in the next major review. In addition, intellectual disability (MIM #309530) has been associated in both OMIM and Gene2Phenotype with X-linked dominant inheritance. |
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| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 | Achchuthan Shanmugasundram Mode of inheritance for gene: IQSEC2 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 |
Achchuthan Shanmugasundram Added comment: Comment on mode of inheritance: There is sufficient evidence (>3 female cases with monoallelic variants causing ID) to suggest that MOI should be updated to 'X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)' in the next major review. In addition, intellectual disability (MIM #309530) has been associated in both OMIM and Gene2Phenotype with X-linked dominant inheritance. |
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| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 | Achchuthan Shanmugasundram Mode of inheritance for gene: IQSEC2 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 |
Achchuthan Shanmugasundram Added comment: Comment on mode of inheritance: There is sufficient evidence (>3 female cases with monoallelic variants causing ID) to suggest that MOI should be updated to 'X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)' in the next major review. In addition, intellectual disability (MIM #309530) has been associated in both OMIM and Gene2Phenotype with X-linked dominant inheritance. |
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| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 | Achchuthan Shanmugasundram Mode of inheritance for gene: IQSEC2 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 | Achchuthan Shanmugasundram Deleted their comment | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 | Achchuthan Shanmugasundram Deleted their comment | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 |
Achchuthan Shanmugasundram Added comment: Comment on mode of inheritance: There is sufficient evidence (>3 female cases with monoallelic variants causing ID) to suggest that MOI should be updated to 'X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)' in the next major review. In addition, intellectual disability (MIM #309530) has been associated in both OMIM and Gene2Phenotype with X-linked dominant inheritance. |
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| Intellectual disability - microarray and sequencing v5.37 | IQSEC2 | Achchuthan Shanmugasundram Mode of inheritance for gene: IQSEC2 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.36 | IQSEC2 |
Achchuthan Shanmugasundram Added comment: Comment on mode of inheritance: There is sufficient evidence (>3 female cases with monoallelic variants causing ID) to suggest that MOI should be updated to 'X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)' in the next major review. In addition, intellectual disability (MIM #309530) has been associated in both OMIM and Gene2Phenotype with X-linked dominant inheritance. |
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| Intellectual disability - microarray and sequencing v5.36 | IQSEC2 | Achchuthan Shanmugasundram Mode of inheritance for gene: IQSEC2 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.36 | IQSEC2 |
Achchuthan Shanmugasundram Added comment: Comment on mode of inheritance: There is sufficient evidence (>3 female cases with monoallelic variants causing ID) to suggest that MOI should be updated to 'X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)' in the next major review. In addition, intellectual disability (MIM #309530) has been associated in both OMIM and Gene2Phenotype with X-linked dominant inheritance. |
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| Intellectual disability - microarray and sequencing v5.36 | IQSEC2 | Achchuthan Shanmugasundram Mode of inheritance for gene: IQSEC2 was changed from X-LINKED: hemizygous mutation in males, biallelic mutations in females to X-LINKED: hemizygous mutation in males, biallelic mutations in females | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.35 | IQSEC2 |
Achchuthan Shanmugasundram changed review comment from: There are more than 20 unrelated cases identified with variants in IQSEC2 gene, as reported in publications. Moderate to severe intellectual disability was present in all affected males. De novo, truncating variants correlate with severe disease in both female and male patients harboring an IQSEC2 alteration. Missense variants in male and female patients account for a milder disease overall, with more severe symptoms in males than females. This evidence suggests that the MOI should be 'X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males)'. Both OMIM and Gene2Phenotype have associated X-linked dominant variants in IQSEC2 with intellectual disability (MIM #309530); to: There are more than 20 unrelated cases identified with variants in IQSEC2 gene, as reported in publications. Moderate to severe intellectual disability was present in all affected males. De novo, truncating variants correlate with severe disease in both female and male patients harboring an IQSEC2 alteration. Missense variants in male and female patients account for a milder disease overall, with more severe symptoms in males than females. |
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| Intellectual disability - microarray and sequencing v5.35 | IQSEC2 | Achchuthan Shanmugasundram Publications for gene: IQSEC2 were set to 20473311; 23674175; 30842726; 31415821; 33368194 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.36 | IQSEC2 | Achchuthan Shanmugasundram Publications for gene: IQSEC2 were set to 20473311; 23674175; 30842726; 31415821; 33368194 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.36 | IQSEC2 | Achchuthan Shanmugasundram Publications for gene: IQSEC2 were set to 20473311; 23674175; 30842726; 31415821; 33368194 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.36 | IQSEC2 | Achchuthan Shanmugasundram Publications for gene: IQSEC2 were set to 20473311; 23674175; 30842726; 31415821; 33368194 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.35 | IQSEC2 | Achchuthan Shanmugasundram Publications for gene: IQSEC2 were set to 20473311; 23674175; 30842726; 31415821; 33368194 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.36 | IQSEC2 | Achchuthan Shanmugasundram Publications for gene: IQSEC2 were set to 20473311; 23674175; 30842726; 31415821; 33368194 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.35 | IQSEC2 | Achchuthan Shanmugasundram Publications for gene: IQSEC2 were set to 20473311; 23674175; 30842726; 31415821; 33368194 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.35 | IQSEC2 | Achchuthan Shanmugasundram Publications for gene: IQSEC2 were set to 20473311; 23674175; 30842726; 31415821; 33368194 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.35 | IQSEC2 | Achchuthan Shanmugasundram Publications for gene: IQSEC2 were set to | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.34 | IQSEC2 | Achchuthan Shanmugasundram Tag Q2_23_MOI tag was added to gene: IQSEC2. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v5.34 | IQSEC2 | Achchuthan Shanmugasundram reviewed gene: IQSEC2: Rating: GREEN; Mode of pathogenicity: None; Publications: 20473311, 23674175, 30842726, 31415821, 33368194; Phenotypes: Intellectual developmental disorder, X-linked 1, OMIM:309530; Mode of inheritance: X-LINKED: hemizygous mutation in males, monoallelic mutations in females may cause disease (may be less severe, later onset than males) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing v2.1098 | IQSEC1 |
Konstantinos Varvagiannis gene: IQSEC1 was added gene: IQSEC1 was added to Intellectual disability. Sources: Literature Mode of inheritance for gene: IQSEC1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: IQSEC1 were set to 31607425 Phenotypes for gene: IQSEC1 were set to Central hypotonia; Global developmental delay; Intellectual disability; Behavioral abnormality; Short stature Penetrance for gene: IQSEC1 were set to Complete Review for gene: IQSEC1 was set to AMBER Added comment: Ansar et al. (2019 - PMID: 31607425) reported on 5 individuals with biallelic IQSEC1 variants. Common features included hypotonia, DD, speech impairment, severe ID, behavioral problems as well as short stature. Early-onset seizures were observed in 3 sibs (for whom there was also a paternal family history of seizures). These subjects belonging to 2 consanguineous families from Pakistan and S. Arabia were found to harbor homozygous missense variants private to each family (Fam1: NM_001134382.2:c.1028C>T or p.Thr354Met following SNP genotyping of several members and exome of the proband | Fam2: c.962G>A or p.Arg321Gln following exome in 2 affected members). Sanger confirmation and study of parents (+/- sibs) were compatible. The homozygous variant was the only candidate in the 1st family (also following exclusion of other causes of ID/short stature), and most likely/compatible with the patient's phenotype in the 2nd. As the authors note, IQSEC1-3 encode guanine exchange factors (GEFs) for the ARF family of GTPases. IQSEC2 is a known XLID gene, while biallelic IQSEC3 mutations in ID have been recently reported (PMID: 31130284), all presenting phenotypic similarities (ID, short stature, speech defect). Previous studies cited had shown that IQSEC1 & 2 are concentrated at the postsynaptic density of glutamatergic synapses in mammalian brain, playing a role in actin-dependent processes incl. AMPA receptor trafficing at synapses (all refs in article). Drosophila model: The ortholog of IQSEC1, 2 and 3 is schizo and the phenotype associated with its loss is a growth cone guidance defect through dysregulation of the Slit-Robo pathway (all refs in article). The authors studied overexpression of either reference IQSEC1 cDNA or variant cDNAs in wt flies, the former only being toxic/lethal. Loss of schizo was also embryonically lethal but was partially rescued by expression of reference IQSEC1 cDNA. Expression of cDNA for the 2 variants did not rescue lethality. As a result LoF appears to be the underlying effect of both variants. The authors provided evidence that schizo is localized in glia and neurons at various stages of development and is important for proper axon guidance in both CNS and PNS. In Drosophila, schizo is also localized in photoreceptors and RNAi-mediated knockdown resulted in severely impaired sight (also observed in 1 patient). Mouse model: Through generation of Iqsec1-floxed mice, it was demonstrated that targeted depletion of Iqsec1 in the cortex resulted in increased density/immature morphology of dendritic spines. IQSEC1 is not associated with any phenotype in OMIM / G2P / SysID and not commonly included in gene panels for ID. As a result, this gene could be considered for inclusion in the ID panel as probably as amber (2 families/variants). Sources: Literature |
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| Intellectual disability - microarray and sequencing v2.468 | IQSEC2 | Louise Daugherty Source Victorian Clinical Genetics Services was added to IQSEC2. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | IQSEC2 | BRIDGE consortium edited their review of IQSEC2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | IQSEC2 | BRIDGE consortium edited their review of IQSEC2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | IQSEC2 | BRIDGE consortium reviewed IQSEC2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||