rs1171786943

Positions:

• chr11-532688-G-A
• chr11-532688-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_005343.4(HRAS):​c.518C>T​(p.Pro173Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,460,820 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: HRAS NM_005343.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.44

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:25430): (leucine rich repeat containing 56) Predicted to be involved in cell projection organization. Predicted to be located in cilium. Implicated in primary ciliary dyskinesia 39. [provided by Alliance of Genome Resources, Apr 2022]

HRAS (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a chain GTPase HRas, N-terminally processed (size 184) in uniprot entity RASH_HUMAN there are 12 pathogenic changes around while only 2 benign (86%) in NM_005343.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.23409304).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HRAS	NM_005343.4	c.518C>T	p.Pro173Leu	missense_variant	5/6	ENST00000311189.8	NP_005334.1
HRAS	NM_176795.5	c.*87C>T		3_prime_UTR_variant	6/6	ENST00000417302.7	NP_789765.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HRAS	ENST00000311189.8	c.518C>T	p.Pro173Leu	missense_variant	5/6	1	NM_005343.4	ENSP00000309845.7
HRAS	ENST00000417302	c.*87C>T		3_prime_UTR_variant	6/6	5	NM_176795.5	ENSP00000388246.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1460820 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 726730

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

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

Labcorp Genetics (formerly Invitae), Labcorp

Aug 27, 2021

In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. 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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a HRAS-related disease. This sequence change replaces proline with leucine at codon 173 of the HRAS protein (p.Pro173Leu). The proline residue is highly conserved and there is a moderate physicochemical difference between proline and leucine. -

Intellectual disability Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Diagnostic Laboratory, Strasbourg University Hospital

Sep 10, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.082
BayesDel_addAF	Benign	0.0032	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.44	T;T;T
Eigen	Benign	-0.47
Eigen_PC	Benign	-0.38
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Benign	0.080	D
MetaRNN	Benign	0.23	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.95	L;L;L
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-2.2	N;N;N
REVEL	Benign	0.16
Sift	Uncertain	0.017	D;D;D
Sift4G	Uncertain	0.018	D;D;D
Polyphen		0.0030	B;B;B
Vest4		0.45
MutPred		0.27		Loss of methylation at K170 (P = 0.0435);Loss of methylation at K170 (P = 0.0435);Loss of methylation at K170 (P = 0.0435);
MVP		0.82
MPC		1.1
ClinPred		0.54	D
GERP RS		1.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.070
gMVP		0.38

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: rs1171786943; hg19: chr11-532688;