NM_001615.4:c.104T>A

Variant names:

• chr2-73901415-T-A
• rs1461116147
• NM_001615.4:c.104T>A

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP2 PP3_Strong

The NM_001615.4(ACTG2):​c.104T>A​(p.Ile35Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,174 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 34)
• Consequence: ACTG2 NM_001615.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.96

Genes affected

ACTG2 (HGNC:145): (actin gamma 2, smooth muscle) Actins are highly conserved proteins that are involved in various types of cell motility and in the maintenance of the cytoskeleton. Three types of actins, alpha, beta and gamma, have been identified in vertebrates. Alpha actins are found in muscle tissues and are a major constituent of the contractile apparatus. The beta and gamma actins co-exist in most cell types as components of the cytoskeleton and as mediators of internal cell motility. This gene encodes actin gamma 2; a smooth muscle actin found in enteric tissues. Alternative splicing results in multiple transcript variants encoding distinct isoforms. Based on similarity to peptide cleavage of related actins, the mature protein of this gene is formed by removal of two N-terminal peptides.[provided by RefSeq, Dec 2010]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the ACTG2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 35 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: 3.3487 (above the threshold of 3.09). Trascript score misZ: 4.3482 (above the threshold of 3.09). GenCC associations: The gene is linked to visceral myopathy 1, familial visceral myopathy, megacystis-microcolon-intestinal hypoperistalsis syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.957

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ACTG2	NM_001615.4	c.104T>A	p.Ile35Asn	missense_variant	Exon 2 of 9	ENST00000345517.8	NP_001606.1
ACTG2	NM_001199893.2	c.104T>A	p.Ile35Asn	missense_variant	Exon 2 of 8		NP_001186822.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ACTG2	ENST00000345517.8	c.104T>A	p.Ile35Asn	missense_variant	Exon 2 of 9	1	NM_001615.4	ENSP00000295137.3

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152174 Hom.: 0 Cov.: 34

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 35

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152174 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 74332

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.36
CADD	Pathogenic	28
DANN	Uncertain	0.97
DEOGEN2	Pathogenic	0.81	.;D;D;.;D
Eigen	Pathogenic	0.73
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.78	T;.;D;D;D
M_CAP	Pathogenic	0.75	D
MetaRNN	Pathogenic	0.96	D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.1	H;H;.;.;H
PrimateAI	Pathogenic	0.92	D
PROVEAN	Uncertain	-3.0	D;D;D;D;D
REVEL	Pathogenic	0.95
Sift4G	Pathogenic	0.0	D;D;D;D;D
Polyphen		1.0, 0.98	.;D;D;.;D
Vest4		0.91
MutPred		0.83		Gain of disorder (P = 0.007);Gain of disorder (P = 0.007);Gain of disorder (P = 0.007);Gain of disorder (P = 0.007);Gain of disorder (P = 0.007);
MVP		1.0
MPC		3.2
ClinPred		0.99	D
GERP RS		3.9
Varity_R		0.96
gMVP		0.95

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: rs1461116147; hg19: chr2-74128542;