Genetic Variant KRAS:c.451-14T>C (chr12-25209925-A-G) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4BP7

This summary comes from the ClinGen Evidence Repository: The c.451-14T>C variant in the KRAS gene is an intronic variant located in intron 6. The filtering allele frequency in gnomAD v4.1.0 is 0.01135% (10/73838 alleles) in the African/African American population (PM2_Supporting/ BS1/ BA1 are not met).This variant is located at a nucleotide that is not highly conserved and is not predicted to impact splicing (BP4, BP7). In summary, this variant meets criteria to be classified as likely benign for autosomal dominant RASopathies based on the ACMG/AMP criteria applied, as specified by the ClinGen RASopathy Variant Curation Expert Panel: BP4, BP7 (Specification Version 2.1, 09/17/2024) LINK:https://erepo.genome.network/evrepo/ui/classification/CA176485/MONDO:0021060/044

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00011 ( 0 hom. )

Consequence

KRAS
NM_004985.5 intron

Scores

Clinical Significance

Likely benign reviewed by expert panel B:4

Conservation

PhyloP100: -0.0430

Variant links:

Genes affected

KRAS (HGNC:6407): (KRAS proto-oncogene, GTPase) This gene, a Kirsten ras oncogene homolog from the mammalian ras gene family, encodes a protein that is a member of the small GTPase superfamily. A single amino acid substitution is responsible for an activating mutation. The transforming protein that results is implicated in various malignancies, including lung adenocarcinoma, mucinous adenoma, ductal carcinoma of the pancreas and colorectal carcinoma. Alternative splicing leads to variants encoding two isoforms that differ in the C-terminal region. [provided by RefSeq, Jul 2008]

KRAS links:

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ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

BP4

For more information check the summary or visit ClinGen Evidence Repository.

BP7

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KRAS	NM_004985.5 link	c.451-14T>C		intron_variant	Intron 4 of 4	ENST00000311936.8	NP_004976.2	P01116-2A0A024RAV5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KRAS	ENST00000311936.8 link	c.451-14T>C		intron_variant	Intron 4 of 4	1	NM_004985.5	ENSP00000308495.3		P01116-2

Frequencies

GnomAD3 genomes

AF:

0.000138

AC:

AN:

152194

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000169

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000162

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000368

AC:

AN:

244656

Hom.:

AF XY:

0.0000378

AC XY:

AN XY:

132450

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000717

Gnomad OTH exome

AF:

0.000169

GnomAD4 exome

AF:

0.000107

AC:

154

AN:

1439078

Hom.:

Cov.:

AF XY:

0.0000921

AC XY:

AN XY:

716772

show subpopulations

Gnomad4 AFR exome

AF:

0.0000926

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000131

Gnomad4 OTH exome

AF:

0.000118

GnomAD4 genome

AF:

0.000138

AC:

AN:

152194

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.000169

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000162

Gnomad4 OTH

AF:

0.000478

Bravo

AF:

0.0000945

ClinVar

Significance: Likely benign

Submissions summary: Benign:4

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not specified

Benign:2

Jul 17, 2013

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

451-14T>C in intron 06 of KRAS: This variant is not expected to have clinical si gnificance because it is not located within the splice consensus sequence and ha s been identified in 0.05% (4/8570) of European American chromosomes by the NHLB I Exome Sequencing Project (http://evs.gs.washington.edu/EVS). -

Apr 23, 2014

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

RASopathy

Benign:2

Jan 23, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 17, 2024

ClinGen RASopathy Variant Curation Expert Panel

Significance: Likely benign

Review Status: reviewed by expert panel

Collection Method: curation

The c.451-14T>C variant in the KRAS gene is an intronic variant located in intron 6. The filtering allele frequency in gnomAD v4.1.0 is 0.01135% (10/73838 alleles) in the African/African American population (PM2_Supporting/ BS1/ BA1 are not met).This variant is located at a nucleotide that is not highly conserved and is not predicted to impact splicing (BP4, BP7). In summary, this variant meets criteria to be classified as likely benign for autosomal dominant RASopathies based on the ACMG/AMP criteria applied, as specified by the ClinGen RASopathy Variant Curation Expert Panel: BP4, BP7 (Specification Version 2.1, 09/17/2024) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.73

CADD

Benign

DANN

Benign

0.69

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over