rs397517040

chr12-25245346-G-Achr12-25245346-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PP5_Moderate BP4 BP7

The NM_004985.5(KRAS):c.39C>T(p.Gly13=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000411 in 1,460,512 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. G13G) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: KRAS NM_004985.5 synonymous
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1 U:2
• Conservation: PhyloP100: 2.58

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 Uncertain_significance. Variant got 0 ACMG points.

• PP5: Variant 12-25245346-G-A is Pathogenic according to our data. Variant chr12-25245346-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 45125.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.26).. Strength limited to SUPPORTING due to the PP5.
• BP7: Synonymous conserved (PhyloP=2.58 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KRAS	NM_033360.4	c.39C>T	p.Gly13=	synonymous_variant	2/6	ENST00000256078.10
KRAS	NM_004985.5	c.39C>T	p.Gly13=	synonymous_variant	2/5	ENST00000311936.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KRAS	ENST00000256078.10	c.39C>T	p.Gly13=	synonymous_variant	2/6	1	NM_033360.4	A1
KRAS	ENST00000311936.8	c.39C>T	p.Gly13=	synonymous_variant	2/5	1	NM_004985.5	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000401 AC: 1 AN: 249446 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 134796

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: 0.0000330

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000411 AC: 6 AN: 1460512 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 726488

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000349

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000332

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1 Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Non-small cell lung carcinoma Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Oct 12, 2011

DNA sequencing of KRAS identified the variants listed above. From this test, we are unable to determine if these variants occur on the same chromosome (in cis) or on different chromosomes (in trans; as listed above). The Gly13Val variant h as been reported in 1 lung adenocarcinoma that did not respond to TKI treatment (Marchetti 2009; COSMIC). The Gly13Gly variant has not been reported in a lung t umor, but has been seen in several other tumor sites, including pancreas and lar ge intestine (COSMIC). If the two variants occur on the same chromosome (in cis) , the resulting variant would be 38_39delinsTT (Gly13Val), which has been previo usly identified in 2 lung carcinomas (COSMIC). Somatic KRAS variants have been a ssociated with resistance to EGFR TKIs (Pao 2005). -

Prostate cancer, hereditary, 1 Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Laboratory of Virology, Oncology, Biosciences and Environment, Faculty of Sciences and Techniques, Mohammedia- University Hassan II of Casablanca

Jul 29, 2022

- -

not provided Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.26
Cadd	Benign	15
Dann	Benign	0.73
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs397517040; hg19: chr12-25398280; COSMIC: COSV55756103;