X-53254526-T-C
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Variant summary
Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3
The NM_001111125.3(IQSEC2):c.1401+4A>G variant causes a splice donor region, intron change. The variant allele was found at a frequency of 0.00000185 in 1,083,163 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).
Frequency
Genomes: not found (cov: 23)
Exomes 𝑓: 0.0000018 ( 0 hom. 1 hem. )
Consequence
IQSEC2
NM_001111125.3 splice_donor_region, intron
NM_001111125.3 splice_donor_region, intron
Scores
2
Splicing: ADA: 0.9984
2
Clinical Significance
Conservation
PhyloP100: 3.80
Genes affected
IQSEC2 (HGNC:29059): (IQ motif and Sec7 domain ArfGEF 2) This gene encodes a guanine nucleotide exchange factor for the ARF family of small GTP-binding proteins. The encoded protein is a component of the postsynaptic density at excitatory synapses, and may play a critical role in cytoskeletal and synaptic organization through the activation of selected ARF substrates including ARF1 and ARF6. Mutations in this gene have been implicated in nonsyndromic X-linked cognitive disability. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Aug 2011]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 3 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
PP3
Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
IQSEC2 | NM_001111125.3 | c.1401+4A>G | splice_donor_region_variant, intron_variant | ENST00000642864.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
IQSEC2 | ENST00000642864.1 | c.1401+4A>G | splice_donor_region_variant, intron_variant | NM_001111125.3 | P1 |
Frequencies
GnomAD3 genomes Cov.: 23
GnomAD3 genomes
Cov.:
23
GnomAD4 exome AF: 0.00000185 AC: 2AN: 1083163Hom.: 0 Cov.: 30 AF XY: 0.00000284 AC XY: 1AN XY: 352709
GnomAD4 exome
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1083163
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30
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1
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352709
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GnomAD4 genome Cov.: 23
GnomAD4 genome
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23
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Intellectual disability, X-linked 1 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Mar 08, 2023 | In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. ClinVar contains an entry for this variant (Variation ID: 538599). This variant has not been reported in the literature in individuals affected with IQSEC2-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change falls in intron 4 of the IQSEC2 gene. It does not directly change the encoded amino acid sequence of the IQSEC2 protein. It affects a nucleotide within the consensus splice site. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_noAF
Benign
CADD
Uncertain
DANN
Benign
Splicing
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Calibrated prediction
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Prediction
dbscSNV1_ADA
Pathogenic
dbscSNV1_RF
Pathogenic
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at