NM_001103.4:c.2276G>C

Variant names:

• chr1-236757607-G-C
• rs786204950
• NM_001103.4:c.2276G>C

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_001103.4(ACTN2):​c.2276G>C​(p.Arg759Thr) 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. Variant has been reported in ClinVar as Pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R759S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ACTN2 NM_001103.4 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 9.96
• Publications: 4 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 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.871
• PP5: Variant 1-236757607-G-C is Pathogenic according to our data. Variant chr1-236757607-G-C is described in ClinVar as Pathogenic. ClinVar VariationId is 189516.Status of the report is no_assertion_criteria_provided, 0 stars.

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.2276G>C	p.Arg759Thr	missense	Exon 18 of 21	NP_001094.1	P35609-1
	ACTN2	NM_001278343.2		c.2276G>C	p.Arg759Thr	missense	Exon 18 of 21	NP_001265272.1	P35609-2
	ACTN2	NR_184402.1		n.2648G>C		non_coding_transcript_exon	Exon 20 of 23

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ACTN2	ENST00000366578.6	TSL:1 MANE Select	c.2276G>C	p.Arg759Thr	missense	Exon 18 of 21	ENSP00000355537.4	P35609-1
	ACTN2	ENST00000542672.7	TSL:1	c.2276G>C	p.Arg759Thr	missense	Exon 18 of 21	ENSP00000443495.1	P35609-2
	ACTN2	ENST00000879537.1		c.2387G>C	p.Arg796Thr	missense	Exon 19 of 22	ENSP00000549596.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Cardiomyopathy, familial hypertrophic, 23, with or without ventricular noncompaction (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.73	D
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.98
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	1.0	D
M_CAP	Benign	0.058	D
MetaRNN	Pathogenic	0.87	D
MetaSVM	Uncertain	0.10	D
MutationAssessor	Uncertain	2.8	M
PhyloP100		10
PrimateAI	Pathogenic	0.84	D
PROVEAN	Pathogenic	-5.4	D
REVEL	Pathogenic	0.69
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0020	D
Polyphen		0.98	D
Vest4		0.91
MutPred		0.57		Loss of methylation at R759 (P = 0.027)
MVP		0.88
MPC		1.0
ClinPred		0.99	D
GERP RS		5.7
Varity_R		0.89
gMVP		0.91
Mutation Taster		=4/96	disease causing (ClinVar)

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: rs786204950; hg19: chr1-236920907;