chr3-52451854-G-C

Position:

• chr3-52451854-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_003280.3(TNNC1):​c.207C>G​(p.Ser69Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TNNC1 NM_003280.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.86

Genes affected

TNNC1 (HGNC:11943): (troponin C1, slow skeletal and cardiac type) Troponin is a central regulatory protein of striated muscle contraction, and together with tropomyosin, is located on the actin filament. Troponin consists of 3 subunits: TnI, which is the inhibitor of actomyosin ATPase; TnT, which contains the binding site for tropomyosin; and TnC, the protein encoded by this gene. The binding of calcium to TnC abolishes the inhibitory action of TnI, thus allowing the interaction of actin with myosin, the hydrolysis of ATP, and the generation of tension. Mutations in this gene are associated with cardiomyopathy dilated type 1Z. [provided by RefSeq, Oct 2008]

TNNC1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a binding_site (size 0) in uniprot entity TNNC1_HUMAN
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TNNC1	NM_003280.3	c.207C>G	p.Ser69Arg	missense_variant	4/6	ENST00000232975.8	NP_003271.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TNNC1	ENST00000232975.8	c.207C>G	p.Ser69Arg	missense_variant	4/6	1	NM_003280.3	ENSP00000232975.3
TNNC1	ENST00000496590.1	c.75C>G	p.Ser25Arg	missense_variant	3/4	2		ENSP00000420596.1
TNNC1	ENST00000461086.1	n.138C>G		non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Dilated cardiomyopathy 1Z;C2750472:Hypertrophic cardiomyopathy 13 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 05, 2018

In summary, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. 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 C15"). This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a TNNC1-related disease. This sequence change replaces serine with arginine at codon 69 of the TNNC1 protein (p.Ser69Arg). The serine residue is highly conserved and there is a moderate physicochemical difference between serine and arginine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
CADD	Benign	15
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.55	D;T
Eigen	Benign	-0.39
Eigen_PC	Benign	-0.62
FATHMM_MKL	Benign	0.35	N
LIST_S2	Uncertain	0.95	D;D
M_CAP	Uncertain	0.27	D
MetaRNN	Uncertain	0.58	D;D
MetaSVM	Uncertain	0.27	D
MutationAssessor	Benign	1.9	L;.
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-2.2	N;N
REVEL	Uncertain	0.54
Sift	Uncertain	0.0010	D;D
Sift4G	Uncertain	0.0080	D;.
Polyphen		1.0	D;.
Vest4		0.72
MutPred		0.47		Loss of glycosylation at S69 (P = 0.0058);.;
MVP		0.86
MPC		3.7
ClinPred		0.93	D
GERP RS		-7.0
Varity_R		0.92
gMVP		0.97

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		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: rs202173903; hg19: chr3-52485870;