14-68875001-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001130004.2(ACTN1):c.2603A>G(p.Asp868Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,194 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. D868N) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: ACTN1 NM_001130004.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.02

Genes affected

ACTN1 (HGNC:163): (actinin alpha 1) 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 nonmuscle, cytoskeletal, alpha actinin isoform and maps to the same site as the structurally similar erythroid beta spectrin gene. Three transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, ACTN1

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ACTN1	NM_001130004.2	c.2603A>G	p.Asp868Gly	missense_variant	22/22	ENST00000394419.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ACTN1	ENST00000394419.9	c.2603A>G	p.Asp868Gly	missense_variant	22/22	1	NM_001130004.2	P3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461194 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 726922

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 08, 2023

The c.2603A>G (p.D868G) alteration is located in exon 22 (coding exon 22) of the ACTN1 gene. This alteration results from a A to G substitution at nucleotide position 2603, causing the aspartic acid (D) at amino acid position 868 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Uncertain	0.052	T
BayesDel_noAF	Benign	-0.16
Cadd	Uncertain	25
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.43	T;.;.;T;.
Eigen	Uncertain	0.32
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.96	D;D;D;D;D
M_CAP	Benign	0.058	D
MetaRNN	Uncertain	0.68	D;D;D;D;D
MetaSVM	Benign	-0.33	T
MutationAssessor	Uncertain	2.4	M;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Uncertain	0.63	T
PROVEAN	Uncertain	-3.7	D;D;D;D;D
REVEL	Benign	0.27
Sift	Uncertain	0.0050	D;D;D;D;D
Sift4G	Uncertain	0.040	D;D;D;D;D
Polyphen		0.077	B;.;B;.;.
Vest4		0.59
MutPred		0.55		Gain of catalytic residue at L848 (P = 0.0143);.;.;.;.;
MVP		0.58
MPC		0.050
ClinPred		0.97	D
GERP RS		4.7
Varity_R		0.64
gMVP		0.68

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr14-69341718;