NM_001613.4:c.445C>G

Variant names:

• chr10-88941794-G-C
• rs121434526
• NM_001613.4:c.445C>G

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM2 PM5 PP2 PP3_Strong

The NM_001613.4(ACTA2):​c.445C>G​(p.Arg149Gly) 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. 13/22 in silico tools predict a damaging outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R149H) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ACTA2 NM_001613.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.93
• Publications: 0 publications found

Genes affected

ACTA2 (HGNC:130): (actin alpha 2, smooth muscle) This gene encodes one of six different actin proteins. Actins are highly conserved proteins that are involved in cell motility, structure, integrity, and intercellular signaling. The encoded protein is a smooth muscle actin that is involved in vascular contractility and blood pressure homeostasis. Mutations in this gene cause a variety of vascular diseases, such as thoracic aortic disease, coronary artery disease, stroke, and Moyamoya disease, as well as multisystemic smooth muscle dysfunction syndrome. [provided by RefSeq, Sep 2017]

STAMBPL1 (HGNC:24105): (STAM binding protein like 1) Predicted to enable Lys63-specific deubiquitinase activity and thiol-dependent deubiquitinase. Predicted to be involved in protein K63-linked deubiquitination. Located in membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr10-88941793-C-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 199671.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP2: Missense variant in the ACTA2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 27 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Trascript score misZ: 4.6117 (above the threshold of 3.09). GenCC associations: The gene is linked to multisystemic smooth muscle dysfunction syndrome, connective tissue disorder, familial thoracic aortic aneurysm and aortic dissection, Moyamoya disease 5, aortic aneurysm, familial thoracic 6.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.966

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001613.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ACTA2	NM_001613.4	MANE Select	c.445C>G	p.Arg149Gly	missense	Exon 5 of 9	NP_001604.1	P62736
	ACTA2	NM_001141945.3		c.445C>G	p.Arg149Gly	missense	Exon 5 of 9	NP_001135417.1	D2JYH4
	ACTA2	NM_001320855.2		c.445C>G	p.Arg149Gly	missense	Exon 5 of 9	NP_001307784.1	P62736

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ACTA2	ENST00000224784.10	TSL:1 MANE Select	c.445C>G	p.Arg149Gly	missense	Exon 5 of 9	ENSP00000224784.6	P62736
	ACTA2	ENST00000713598.1		c.487C>G	p.Arg163Gly	missense	Exon 5 of 9	ENSP00000518894.1	A0AAQ5BGG5
	ACTA2	ENST00000415557.2	TSL:3	c.445C>G	p.Arg149Gly	missense	Exon 5 of 9	ENSP00000396730.2	P62736

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D
Eigen	Pathogenic	0.96
Eigen_PC	Pathogenic	0.89
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.94	D
M_CAP	Pathogenic	0.68	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	4.0	H
PhyloP100		7.9
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-5.5	D
REVEL	Pathogenic	0.96
Sift4G	Uncertain	0.013	D
Polyphen		0.70	P
Vest4		0.94
MutPred		0.83		Loss of methylation at R149 (P = 0.0106)
MVP		0.98
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.99
gMVP		1.0
Mutation Taster		=1/99	disease causing

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

Other links and lift over

dbSNP: rs121434526; hg19: chr10-90701551;