11-533774-G-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.282C>G(p.His94Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,040 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict 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. H94Y) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: HRAS NM_005343.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.12

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 64 pathogenic changes around while only 17 benign (79%) in NM_005343.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.35338843).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HRAS	NM_005343.4	c.282C>G	p.His94Gln	missense_variant	3/6	ENST00000311189.8
HRAS	NM_176795.5	c.282C>G	p.His94Gln	missense_variant	3/6	ENST00000417302.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HRAS	ENST00000311189.8	c.282C>G	p.His94Gln	missense_variant	3/6	1	NM_005343.4	P1
HRAS	ENST00000417302.7	c.282C>G	p.His94Gln	missense_variant	3/6	5	NM_176795.5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461040 Hom.: 0 Cov.: 34 AF XY: 0.00000550 AC XY: 4 AN XY: 726846

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Costello syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

May 28, 2022

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt HRAS protein function. ClinVar contains an entry for this variant (Variation ID: 852174). This variant has not been reported in the literature in individuals affected with HRAS-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces histidine, which is basic and polar, with glutamine, which is neutral and polar, at codon 94 of the HRAS protein (p.His94Gln). -

Cardiovascular phenotype Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 10, 2024

The p.H94Q variant (also known as c.282C>G), located in coding exon 2 of the HRAS gene, results from a C to G substitution at nucleotide position 282. The histidine at codon 94 is replaced by glutamine, an amino acid with highly similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Uncertain	0.049	T
BayesDel_noAF	Benign	-0.17
Cadd	Benign	19
Dann	Benign	0.83
Eigen	Benign	-1.1
Eigen_PC	Benign	-0.87
FATHMM_MKL	Uncertain	0.97	D
M_CAP	Uncertain	0.089	D
MetaRNN	Benign	0.35	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-1.1	N;N;N;N;N
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Uncertain	0.77	T
PROVEAN	Benign	-1.8	N;N;N;N;N
REVEL	Uncertain	0.40
Sift	Benign	0.46	T;T;T;T;T
Sift4G	Benign	0.78	T;T;T;T;T
Polyphen		0.0050	B;B;B;B;B
Vest4		0.72
MutPred		0.25		Gain of relative solvent accessibility (P = 0.1066);Gain of relative solvent accessibility (P = 0.1066);Gain of relative solvent accessibility (P = 0.1066);Gain of relative solvent accessibility (P = 0.1066);Gain of relative solvent accessibility (P = 0.1066);
MVP		0.50
MPC		1.0
ClinPred		0.18	T
GERP RS		-0.40
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.47
gMVP		0.46

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs375893752; hg19: chr11-533774;