19-38647758-C-T

Position:

• chr19-38647758-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM1 PM2 PP2

The NM_004924.6(ACTN4):​c.13C>T​(p.His5Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000143 in 1,398,308 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ACTN4 NM_004924.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.70

Genes affected

ACTN4 (HGNC:166): (actinin alpha 4) 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, alpha actinin isoform which is concentrated in the cytoplasm, and thought to be involved in metastatic processes. Mutations in this gene have been associated with focal and segmental glomerulosclerosis. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a region_of_interest Actin-binding (size 268) in uniprot entity ACTN4_HUMAN there are 17 pathogenic changes around while only 4 benign (81%) in NM_004924.6
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), ACTN4. . Gene score misZ 4.1552 (greater than the threshold 3.09). Trascript score misZ 5.6825 (greater than threshold 3.09). GenCC has associacion of gene with familial idiopathic steroid-resistant nephrotic syndrome, focal segmental glomerulosclerosis 1.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ACTN4	NM_004924.6	c.13C>T	p.His5Tyr	missense_variant	1/21	ENST00000252699.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ACTN4	ENST00000252699.7	c.13C>T	p.His5Tyr	missense_variant	1/21	1	NM_004924.6	A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000143 AC: 2 AN: 1398308 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 691194

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.24e-7

Gnomad4 OTH exome AF: 0.0000173

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 01, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Not Available"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Not Available"). This variant has not been reported in the literature in individuals with ACTN4-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This sequence change replaces histidine with tyrosine at codon 5 of the ACTN4 protein (p.His5Tyr). The histidine residue is moderately conserved and there is a moderate physicochemical difference between histidine and tyrosine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Uncertain	0.040	T
BayesDel_noAF	Benign	-0.18
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.31	T;.;T
Eigen	Benign	-0.20
Eigen_PC	Benign	-0.041
FATHMM_MKL	Uncertain	0.97	D
M_CAP	Pathogenic	0.96	D
MetaRNN	Uncertain	0.45	T;T;T
MetaSVM	Benign	-0.72	T
MutationAssessor	Benign	-0.20	N;N;.
MutationTaster	Benign	0.99	D;N;N
PrimateAI	Pathogenic	0.88	D
PROVEAN	Benign	0.040	N;N;N
REVEL	Benign	0.15
Sift	Uncertain	0.0090	D;D;D
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		0.21	B;.;.
Vest4		0.37
MutPred		0.10		Gain of phosphorylation at H5 (P = 0.0238);Gain of phosphorylation at H5 (P = 0.0238);Gain of phosphorylation at H5 (P = 0.0238);
MVP		0.64
MPC		2.4
ClinPred		0.91	D
GERP RS		4.7
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		2.9
Varity_R		0.25
gMVP		0.85

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: rs1599749535; hg19: chr19-39138398;