chr7-128855243-G-C

Variant names:

• chr7-128855243-G-C
• rs1554401561
• NM_001458.5:c.7180G>C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP5

The NM_001458.5(FLNC):​c.7180G>C​(p.Asp2394His) 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 Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: FLNC NM_001458.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 9.91

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]

FLNC-AS1 (HGNC:53474): (FLNC antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 7-128855243-G-C is Pathogenic according to our data. Variant chr7-128855243-G-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 539375.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FLNC	NM_001458.5	c.7180G>C	p.Asp2394His	missense_variant	Exon 43 of 48	ENST00000325888.13	NP_001449.3
FLNC	NM_001127487.2	c.7081G>C	p.Asp2361His	missense_variant	Exon 42 of 47		NP_001120959.1
FLNC-AS1	NR_149055.1	n.103-1846C>G		intron_variant	Intron 1 of 3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FLNC	ENST00000325888.13	c.7180G>C	p.Asp2394His	missense_variant	Exon 43 of 48	1	NM_001458.5	ENSP00000327145.8
FLNC	ENST00000346177.6	c.7081G>C	p.Asp2361His	missense_variant	Exon 42 of 47	1		ENSP00000344002.6
FLNC-AS1	ENST00000469965.1	n.103-1846C>G		intron_variant	Intron 1 of 3	4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Primary familial hypertrophic cardiomyopathy Pathogenic:1

Nov 29, 2017

Rady Children's Institute for Genomic Medicine, Rady Children's Hospital San Diego

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been previously reported in the literature to our knowledge and it is absent from the ExAC and gnomAD population databases, thus it is presumed to be rare. This variant is a non-conservative amino acid change in a missense intolerant gene. The residue is highly conserved among eukaryotes and the change is predicted to be damaging by in silico methods. No functional characterizations of the variant are available for review but missense variants in this gene have previously been demonstrated to cause disease (PMID: 26666891, 25351925). Analysis of the parental samples was negative for the variant, indicating this variant likely occurred as a de novo event. Based on the available evidence, the c.7180G>C, p.Asp2394His variant is classified as likely pathogenic. -

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

Nov 20, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces aspartic acid with histidine at codon 2394 of the FLNC protein (p.Asp2394His). The aspartic acid residue is highly conserved and there is a moderate physicochemical difference between aspartic acid and histidine. 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 do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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	Pathogenic	0.66
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.070
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.82	D;.
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.97	D;D
M_CAP	Uncertain	0.25	D
MetaRNN	Uncertain	0.65	D;D
MetaSVM	Pathogenic	0.90	D
MutationAssessor	Uncertain	2.2	M;.
PrimateAI	Uncertain	0.70	T
PROVEAN	Pathogenic	-4.8	D;D
REVEL	Pathogenic	0.76
Sift	Uncertain	0.0020	D;D
Sift4G	Uncertain	0.0090	D;D
Polyphen		1.0	D;D
Vest4		0.47
MutPred		0.59		Gain of catalytic residue at I2392 (P = 0.0796);.;
MVP		0.85
MPC		1.9
ClinPred		1.0	D
GERP RS		5.3
Varity_R		0.77
gMVP		0.74

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: rs1554401561; hg19: chr7-128495297;