chr7-128830653-G-C

Position:

• chr7-128830653-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 5P and 2B. PM1 PM2 PP2 BP4_Moderate

The NM_001458.5(FLNC):​c.16G>C​(p.Gly6Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: FLNC NM_001458.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0750

Genes affected

FLNC (HGNC:3756): (filamin C) This gene encodes one of three related filamin genes, specifically gamma filamin. These filamin proteins crosslink actin filaments into orthogonal networks in cortical cytoplasm and participate in the anchoring of membrane proteins for the actin cytoskeleton. Three functional domains exist in filamin: an N-terminal filamentous actin-binding domain, a C-terminal self-association domain, and a membrane glycoprotein-binding domain. Mutations in this gene are a cause of cardiopathy. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a region_of_interest Actin-binding (size 258) in uniprot entity FLNC_HUMAN there are 10 pathogenic changes around while only 2 benign (83%) in NM_001458.5
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), FLNC. . Gene score misZ 2.789 (greater than the threshold 3.09). Trascript score misZ 5.9457 (greater than threshold 3.09). GenCC has associacion of gene with dilated cardiomyopathy, heart conduction disease, familial isolated restrictive cardiomyopathy, hypertrophic cardiomyopathy 26, distal myopathy with posterior leg and anterior hand involvement, myofibrillar myopathy 5.
• BP4: Computational evidence support a benign effect (MetaRNN=0.12517154).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FLNC	NM_001458.5	c.16G>C	p.Gly6Arg	missense_variant	1/48	ENST00000325888.13	NP_001449.3
FLNC	NM_001127487.2	c.16G>C	p.Gly6Arg	missense_variant	1/47		NP_001120959.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FLNC	ENST00000325888.13	c.16G>C	p.Gly6Arg	missense_variant	1/48	1	NM_001458.5	ENSP00000327145.8
FLNC	ENST00000346177.6	c.16G>C	p.Gly6Arg	missense_variant	1/47	1		ENSP00000344002.6

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Myofibrillar myopathy 5;C3279722:Distal myopathy with posterior leg and anterior hand involvement;C4310749:Hypertrophic cardiomyopathy 26;CN239310:Dilated Cardiomyopathy, Dominant Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 20, 2018

This sequence change replaces glycine with arginine at codon 6 of the FLNC protein (p.Gly6Arg). The glycine residue is weakly conserved and there is a moderate physicochemical difference between glycine and arginine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with FLNC-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.46
CADD	Benign	21
DANN	Uncertain	0.98
DEOGEN2	Benign	0.26	T;.
Eigen	Benign	-0.55
Eigen_PC	Benign	-0.49
FATHMM_MKL	Benign	0.37	N
LIST_S2	Benign	0.86	D;D
M_CAP	Pathogenic	0.68	D
MetaRNN	Benign	0.13	T;T
MetaSVM	Benign	-0.56	T
MutationAssessor	Benign	-0.69	N;N
MutationTaster	Benign	0.98	N;N
PrimateAI	Uncertain	0.74	T
PROVEAN	Benign	-1.2	N;N
REVEL	Benign	0.20
Sift	Benign	0.031	D;D
Sift4G	Benign	0.52	T;T
Polyphen		0.013	B;B
Vest4		0.11
MutPred		0.24		Loss of glycosylation at S5 (P = 0.0339);Loss of glycosylation at S5 (P = 0.0339);
MVP		0.26
MPC		1.2
ClinPred		0.12	T
GERP RS		2.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.066
gMVP		0.23

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: rs1284761356; hg19: chr7-128470707;