rs397517041

chr12-25209908-C-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Moderate

The NM_004985.5(KRAS):c.454G>T(p.Val152Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 9/15 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V152G) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 33)
• Consequence: KRAS NM_004985.5 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.52

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]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_004985.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr12-25209907-A-C is described in ClinVar as [Pathogenic]. Clinvar id is 12591.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.946
• PP5: Variant 12-25209908-C-A is Pathogenic according to our data. Variant chr12-25209908-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 45126.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KRAS	NM_004985.5	c.454G>T	p.Val152Phe	missense_variant	5/5	ENST00000311936.8
KRAS	NM_033360.4	c.*8G>T		3_prime_UTR_variant	6/6	ENST00000256078.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KRAS	ENST00000311936.8	c.454G>T	p.Val152Phe	missense_variant	5/5	1	NM_004985.5	P4
KRAS	ENST00000256078.10	c.*8G>T		3_prime_UTR_variant	6/6	1	NM_033360.4	A1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Noonan syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 03, 2011

The Val152Phe variant in KRAS has not been previously reported in the literature or been identified by our laboratory. However, a different amino acid change at this position, Val152Gly, has been reported as a de novo variant in an individu al with severe NS overlapping CS and CFC (Carta 2006). Val152 is conserved acros s evolutionarily distinct species and computational analyses (PolyPhen2, SIFT, A lignGVGD) predict that this variant will impact the normal function of KRAS. It should be noted that the sensitivity and specificity of these computational prog rams has not been determined by our laboratory. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.40
Cadd	Pathogenic	29
Dann	Uncertain	1.0
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.89	D;D
M_CAP	Pathogenic	0.41	D
MetaRNN	Pathogenic	0.95	D;D
MetaSVM	Uncertain	0.56	D
MutationTaster	Benign	1.0	D;D;D
PROVEAN	Pathogenic	-4.4	D;N
REVEL	Pathogenic	0.84
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	D;.
Vest4		0.93
MutPred		0.81		Gain of catalytic residue at R149 (P = 0.045);.;
MVP		0.98
ClinPred		0.97	D
GERP RS		5.9

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

Other links and lift over

dbSNP: rs397517041; hg19: chr12-25362842;