ASXL1 c.2011G>T, p.Ala671Ser
NM_015338.5:c.2011G>T
COSM110703
Population Frequency
0.0 in 100,000
Rare
ClinVar Classification
Uncertain Significance (VUS)
0 publications
REVEL Score
0.108
Likely Benign
COSMIC Recurrence
1 occurrences
No Criteria Applied
Classification Evidence
Detailed Information
Genetic Information
Gene & Transcript Details
Gene
ASXL1
Transcript
NM_015338.6
MANE Select
Total Exons
13
Strand
Forward (+)
Reference Sequence
NC_000020.10
Alternative Transcripts
| ID | Status | Details |
|---|---|---|
| NM_015338.5 | RefSeq Select | 13 exons | Forward |
| NM_015338.4 | Alternative | 13 exons | Forward |
| NM_015338.3 | Alternative | 13 exons | Forward |
Variant Details
HGVS Notation
NM_015338.5:c.2011G>T
Protein Change
A671S
Location
Exon 13
(Exon 13 of 13)
5'
Exon Structure (13 total)
3'
Functional Consequence
Loss of Function
Related Variants
No evidence of other pathogenic variants at position 671 in gene ASXL1
Alternate Identifiers
COSM110703
Variant interpretation based on transcript NM_015338.6
Clinical Evidence
Population Frequency
Global Frequency
0.0 in 100,000
Extremely Rare
Global: 0.0%
0%
0.0005%
0.001%
0.01%
0.05%
1%+
ACMG Criteria Applied
PM2
This variant is not present in gnomAD (PM2 criteria applies).
Classification
Uncertain Significance (VUS)
Based on 2 submitter reviews in ClinVar
Submitter Breakdown
Pathogenic
Likely Pathogenic
VUS
Likely Benign
Benign
Publications
0 publications
Clinical Statement
This variant has been reported in ClinVar as Likely benign (1 clinical laboratories) and as Uncertain significance (1 clinical laboratories).
Functional Domain
Hotspot Status
Not a hotspot
Domain Summary
This variant is not located in a mutational hotspot or critical domain (0 mutations).
Related Variants in This Domain
No evidence of other pathogenic variants at position 671 in gene ASXL1
Functional Studies
Summary
The ASXL1 A671S variant has not been functionally characterized, and its biological significance remains unknown.
Computational Evidence
Pathogenicity Predictions
REVEL Score
0.108
0.108
Likely Benign
0.0
Uncertain (Low)
0.2
Uncertain (Med)
0.5
Likely Pathogenic
0.75
REVEL scores ≥ 0.75 are considered strong evidence of pathogenicity (PP3)
Predictor Consensus
Mixed/VUS
PP3 Applied
No
Additional Predictors
Benign:
CADD: 1.66
polyphen_prediction: benign
metasvm: T
metalr: T
primateai: T
Neutral:
Show all
VCEP Guidelines
Applied ACMG/AMP Criteria
PVS1
PVS1 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PVS1 is: "Null variant (nonsense, frameshift, canonical ±1 or 2 splice sites, initiation codon, single or multi-exon deletion) in a gene where loss of function (LoF) is a known mechanism of disease." The evidence for this variant shows it is a missense change (A671S), not a null variant. Therefore, this criterion is not applied because the variant does not meet the definition of a null variant.
PS1
PS1 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PS1 is: "Same amino acid change as a previously established pathogenic variant regardless of nucleotide change." The evidence for this variant shows there is no previously established pathogenic variant at amino acid position 671 in ASXL1. Therefore, this criterion is not applied.
PS2
PS2 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PS2 is: "De novo (both maternity and paternity confirmed) in a patient with the disease and no family history." There are no data on de novo status for this variant. Therefore, this criterion is not applied.
PS3
PS3 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PS3 is: "Well-established functional studies supportive of a damaging effect on the gene or gene product." There are no functional studies available for ASXL1 A671S. Therefore, this criterion is not applied.
PS4
PS4 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PS4 is: "Prevalence in affected individuals significantly increased compared with controls." There are no case-control or cohort data for A671S. Therefore, this criterion is not applied.
PM1
PM1 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PM1 is: "Located in a mutational hot spot or well-established functional domain without benign variation." The A671 position is not a known mutational hotspot or characterized functional domain. Therefore, this criterion is not applied.
PM2
PM2 (Moderate)
According to standard ACMG guidelines, the rule for PM2 is: "Absent from controls (or at extremely low frequency if recessive)." The evidence for this variant shows it is not found in gnomAD or other population databases (MAF=0%). Therefore, this criterion is applied at Moderate strength because the variant is absent from control populations.
PM3
PM3 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PM3 is: "Detected in trans with a pathogenic variant (for recessive disorders)." There are no data on the variant being in trans with another pathogenic variant. Therefore, this criterion is not applied.
PM4
PM4 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PM4 is: "Protein length changes due to in-frame deletions/insertions or stop-loss variants." This variant is a missense substitution with no change in protein length. Therefore, this criterion is not applied.
PM5
PM5 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PM5 is: "Novel missense change at an amino acid residue where a different pathogenic missense change has been seen." There is no record of any other pathogenic missense change at residue A671. Therefore, this criterion is not applied.
PM6
PM6 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PM6 is: "Assumed de novo, but without confirmation of paternity and maternity." There are no data on de novo occurrence. Therefore, this criterion is not applied.
PP1
PP1 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PP1 is: "Co-segregation with disease in multiple affected family members." There are no segregation data available. Therefore, this criterion is not applied.
PP2
PP2 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PP2 is: "Missense variant in a gene with a low rate of benign missense variation and where missense variants are a common mechanism of disease." ASXL1 disease mechanism is haploinsufficiency (LoF), not missense. Therefore, this criterion is not applied.
PP3
PP3 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PP3 is: "Multiple lines of computational evidence support a deleterious effect on the gene/gene product." Computational evidence (REVEL 0.11, CADD, PolyPhen, SpliceAI) predicts a benign impact. Therefore, this criterion is not applied.
PP4
PP4 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PP4 is: "Patient’s phenotype or family history highly specific for a disease with a single genetic etiology." No phenotype or clinical context is provided. Therefore, this criterion is not applied.
PP5
PP5 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for PP5 is: "Reputable source reports variant as pathogenic, but without accessible evidence." ClinVar reports are VUS and LB, not pathogenic. Therefore, this criterion is not applied.
BA1
BA1 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BA1 is: "Allele frequency is too high for the disorder." The allele frequency is 0% in population databases. Therefore, this criterion is not applied.
BS1
BS1 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BS1 is: "Allele frequency is greater than expected for the disorder." The variant is absent from controls. Therefore, this criterion is not applied.
BS2
BS2 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BS2 is: "Observed in a healthy adult individual for a dominant disorder with full penetrance expected at an early age." There are no data on observation in healthy individuals. Therefore, this criterion is not applied.
BS3
BS3 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BS3 is: "Well-established functional studies show no damaging effect on protein function or splicing." No functional studies are available. Therefore, this criterion is not applied.
BS4
BS4 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BS4 is: "Lack of segregation in affected family members." There are no segregation data. Therefore, this criterion is not applied.
BP1
BP1 (Supporting)
According to standard ACMG guidelines, the rule for BP1 is: "Missense variant in a gene where only loss-of-function causes disease (e.g., ASXL1 haploinsufficiency)." The evidence for this variant shows it is a missense change in ASXL1, where disease is caused by LoF. Therefore, this criterion is applied at Supporting strength.
BP2
BP2 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BP2 is: "Observed in trans with a pathogenic variant for dominant disorders or in cis with a pathogenic variant." There are no data on cis/trans occurrence. Therefore, this criterion is not applied.
BP3
BP3 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BP3 is: "In-frame deletions/insertions in a repetitive region without known function." This is a missense change. Therefore, this criterion is not applied.
BP4
BP4 (Supporting)
According to standard ACMG guidelines, the rule for BP4 is: "Multiple lines of computational evidence suggest no impact on gene or gene product." Computational evidence (REVEL=0.11 below 0.15 threshold, benign CADD, PolyPhen, SpliceAI) supports benign impact. Therefore, this criterion is applied at Supporting strength.
BP5
BP5 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BP5 is: "Variant found in a case with an alternate molecular basis for disease." No cases with alternate molecular basis are reported. Therefore, this criterion is not applied.
BP6
BP6 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BP6 is: "Reputable source reports variant as benign, but without accessible evidence." ClinVar submissions include Likely Benign with evidence, so BP6 is not appropriate. Therefore, this criterion is not applied.
BP7
BP7 (Not Applied)
Strength Modified
According to standard ACMG guidelines, the rule for BP7 is: "Synonymous variant with no predicted impact on splicing." This is a missense change. Therefore, this criterion is not applied.