11-534217-T-C

Position:

• chr11-534217-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM1 PM2 BP4

The NM_005343.4(HRAS):​c.106A>G​(p.Ile36Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I36T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: HRAS NM_005343.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.37

Genes affected

HRAS (HGNC:5173): (HRas proto-oncogene, GTPase) This gene belongs to the Ras oncogene family, whose members are related to the transforming genes of mammalian sarcoma retroviruses. The products encoded by these genes function in signal transduction pathways. These proteins can bind GTP and GDP, and they have intrinsic GTPase activity. This protein undergoes a continuous cycle of de- and re-palmitoylation, which regulates its rapid exchange between the plasma membrane and the Golgi apparatus. Mutations in this gene cause Costello syndrome, a disease characterized by increased growth at the prenatal stage, growth deficiency at the postnatal stage, predisposition to tumor formation, cognitive disability, skin and musculoskeletal abnormalities, distinctive facial appearance and cardiovascular abnormalities. Defects in this gene are implicated in a variety of cancers, including bladder cancer, follicular thyroid cancer, and oral squamous cell carcinoma. Multiple transcript variants, which encode different isoforms, have been identified for this gene. [provided by RefSeq, Jul 2008]

LRRC56 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a chain GTPase HRas (size 185) in uniprot entity RASH_HUMAN there are 67 pathogenic changes around while only 17 benign (80%) in NM_005343.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.38337103).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HRAS	NM_005343.4	c.106A>G	p.Ile36Val	missense_variant	2/6	ENST00000311189.8
HRAS	NM_176795.5	c.106A>G	p.Ile36Val	missense_variant	2/6	ENST00000417302.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HRAS	ENST00000311189.8	c.106A>G	p.Ile36Val	missense_variant	2/6	1	NM_005343.4	P1
HRAS	ENST00000417302.7	c.106A>G	p.Ile36Val	missense_variant	2/6	5	NM_176795.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Costello syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 27, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C25"). This variant has not been reported in the literature in individuals affected with HRAS-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces isoleucine with valine at codon 36 of the HRAS protein (p.Ile36Val). The isoleucine residue is highly conserved and there is a small physicochemical difference between isoleucine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.85
BayesDel_addAF	Benign	0.0011	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.46	.;T;.;T;T
Eigen	Benign	-0.030
Eigen_PC	Benign	0.029
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Uncertain	0.090	D
MetaRNN	Benign	0.38	T;T;T;T;T
MetaSVM	Benign	-0.34	T
MutationAssessor	Benign	1.5	L;L;L;L;L
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Uncertain	0.65	T
PROVEAN	Benign	-0.72	N;N;N;N;N
REVEL	Uncertain	0.45
Sift	Uncertain	0.0030	D;D;D;D;D
Sift4G	Uncertain	0.017	D;D;D;D;D
Polyphen		0.18	B;B;B;B;B
Vest4		0.45
MutPred		0.74		Loss of catalytic residue at I36 (P = 0.0624);Loss of catalytic residue at I36 (P = 0.0624);Loss of catalytic residue at I36 (P = 0.0624);Loss of catalytic residue at I36 (P = 0.0624);Loss of catalytic residue at I36 (P = 0.0624);
MVP		0.84
MPC		1.2
ClinPred		0.87	D
GERP RS		3.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.73
gMVP		0.72

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: rs1060502663; hg19: chr11-534217; COSMIC: COSV54242895; COSMIC: COSV54242895;