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LYFE SCIENCES
Project: HERA
NM_002524.4:c.71T>A
p.Ile24Asn  ·  NRAS
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Classification rationale
1

The NRAS c.71T>A (p.Ile24Asn) variant has been reported in ClinVar and is classified as Likely Pathogenic by the ClinGen RASopathy expert panel.

clinvar ↗
2

This variant is absent from gnomAD v2.1 and gnomAD v4.1, supporting rarity under the NRAS RASopathy framework.

gnomad_v2 ↗ gnomad_v4 ↗ cspec ↗
3

In expert-panel-reviewed functional evidence, RAS activation assays showed mildly increased GTP-bound RAS with enhanced MAPK phosphorylation, and a zebrafish model showed developmental and craniofacial defects that were rescued by MEK inhibition, supporting an abnormal gain-of-function effect.

clinvar ↗
4

Computational evidence supports a damaging missense effect, with REVEL 0.863 above the PP3 threshold of 0.7, SpliceAI showing no significant splice impact with a maximum delta score of 0.00, and BayesDel 0.159947.

spliceai ↗ cspec ↗
Applied criteria
Met
Not met
Not assessed
N/A
Very strong
Strong
Moderate
Supporting
Pathogenic evidence
PVS
PVS1
PS
PS1
PS2
PS3
PS4
PM
PM1
PM2
PM3
PM4
PM5
PM6
PP
PP1
PP2
PP3
PP4
PP5
Benign evidence
BA
BA1
BS
BS1
BS2
BS3
BS4
BP
BP1
BP2
BP3
BP4
BP5
BP6
BP7
PVS1
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Rationale
Select a criterion to inspect its explanation.
Evidence used
  • —
Gaps remaining
  • —
Rule
—
Publications
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Research and evidence
ClinVar evidence
02
ClinVar
This variant has been reported in ClinVar as Pathogenic (1 clinical laboratory) and as Likely Pathogenic by ClinGen RASopathy Variant Curation Expert Panel (expert panel).
ClinVar ↗
Functional evidence
03
Functional
OncoKB: Likely Oncogenic
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Likely Gain-of-function; curated oncogenicity label: Likely Oncogenic.
OncoKB ↗
In silico evidence
04
In silico
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). REVEL score = 0.863. BayesDel score = 0.159947.
SpliceAI ↗
COSMIC evidence
05
COSMIC
This variant does not lie in a statistically significant hotspot. This variant has not previously been reported in somatic cancers (COSMIC).
COSMIC ↗
Cancer hotspots evidence
06
Cancer hotspots Not found
This variant does not lie in a statistically significant hotspot.
ResidueI24
Hotspots ↗