1-236720170-A-G

Variant names:

• chr1-236720170-A-G
• rs786205453
• NM_001103.4:c.427A>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001103.4(ACTN2):​c.427A>G​(p.Ile143Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. I143T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 34)
• Consequence: ACTN2 NM_001103.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 9.20
• Publications: 1 publications found

Genes affected

ACTN2 (HGNC:164): (actinin alpha 2) Alpha actinins belong to the spectrin gene superfamily which represents a diverse group of cytoskeletal proteins, including the alpha and beta spectrins and dystrophins. Alpha actinin is an actin-binding protein with multiple roles in different cell types. In nonmuscle cells, the cytoskeletal isoform is found along microfilament bundles and adherens-type junctions, where it is involved in binding actin to the membrane. In contrast, skeletal, cardiac, and smooth muscle isoforms are localized to the Z-disc and analogous dense bodies, where they help anchor the myofibrillar actin filaments. This gene encodes a muscle-specific, alpha actinin isoform that is expressed in both skeletal and cardiac muscles. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2013]

ACTN2 Gene-Disease associations (from GenCC):

• ACTN2-related cardiac and skeletal myopathy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• myopathy, congenital, with structured cores and z-line abnormalities

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• dilated cardiomyopathy 1AA

  Inheritance: AD Classification: MODERATE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• intrinsic cardiomyopathy

  Inheritance: AD Classification: MODERATE Submitted by: Laboratory for Molecular Medicine
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• heart conduction disease

  Inheritance: AD Classification: LIMITED Submitted by: Genomics England PanelApp
• myopathy, distal, 6, adult-onset, autosomal dominant

  Inheritance: AD, Unknown Classification: LIMITED Submitted by: Broad Center for Mendelian Genomics, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001103.4. 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
	ACTN2	NM_001103.4	MANE Select	c.427A>G	p.Ile143Val	missense	Exon 4 of 21	NP_001094.1	P35609-1
	ACTN2	NM_001278343.2		c.427A>G	p.Ile143Val	missense	Exon 4 of 21	NP_001265272.1	P35609-2
	ACTN2	NR_184402.1		n.602A>G		non_coding_transcript_exon	Exon 4 of 23

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ACTN2	ENST00000366578.6	TSL:1 MANE Select	c.427A>G	p.Ile143Val	missense	Exon 4 of 21	ENSP00000355537.4	P35609-1
	ACTN2	ENST00000542672.7	TSL:1	c.427A>G	p.Ile143Val	missense	Exon 4 of 21	ENSP00000443495.1	P35609-2
	ACTN2	ENST00000879537.1		c.427A>G	p.Ile143Val	missense	Exon 4 of 22	ENSP00000549596.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 34

Alfa AF: 0.00000506 Hom.: 0

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	not provided (2)
-	1	-	Primary familial hypertrophic cardiomyopathy;C2677338:Dilated cardiomyopathy 1AA (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.84
BayesDel_addAF	Uncertain	0.058	T
BayesDel_noAF	Benign	-0.15
CADD	Uncertain	24
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.59	D
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D
M_CAP	Benign	0.011	T
MetaRNN	Uncertain	0.53	D
MetaSVM	Benign	-0.41	T
MutationAssessor	Uncertain	2.3	M
PhyloP100		9.2
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-0.86	N
REVEL	Uncertain	0.35
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.024	D
Polyphen		0.079	B
Vest4		0.53
MutPred		0.80		Gain of disorder (P = 0.1545)
MVP		0.65
MPC		0.89
ClinPred		0.95	D
GERP RS		5.8
Varity_R		0.68
gMVP		0.51
Mutation Taster		=53/47	polymorphism

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

Other links and lift over

dbSNP: rs786205453; hg19: chr1-236883470;