rs777080663

Variant names:

• chr10-68143056-C-A
• rs777080663
• NM_032578.4:c.1019C>A

Your query was ambiguous. Multiple possible variants found:

• chr10-68143056-C-A
• chr10-68143056-C-G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_032578.4(MYPN):​c.1019C>A​(p.Ser340Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 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. S340C) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYPN NM_032578.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.83
• Publications: 0 publications found

Genes affected

MYPN (HGNC:23246): (myopalladin) Striated muscle in vertebrates comprises large proteins which must be organized properly to contract efficiently. Z-lines in striated muscle are a sign of this organization, representing the ends of actin thin filaments, titin, nebulin or nebulette and accessory proteins required for structure and function. This gene encodes a protein which interacts with nebulin in skeletal muscle or nebulette in cardiac muscle and alpha-actinin. In addition, this gene product can interact with a protein with the I-band indicating it has a regulatory as well as structural function. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2011]

MYPN Gene-Disease associations (from GenCC):

• MYPN-related myopathy

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen
• cap myopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• childhood-onset nemaline myopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial isolated restrictive cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• dilated cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• dilated cardiomyopathy 1KK

  Inheritance: AD Classification: LIMITED Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae)
• hypertrophic cardiomyopathy

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.831

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYPN	NM_032578.4	c.1019C>A	p.Ser340Tyr	missense_variant	Exon 3 of 20	ENST00000358913.10	NP_115967.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYPN	ENST00000358913.10	c.1019C>A	p.Ser340Tyr	missense_variant	Exon 3 of 20	1	NM_032578.4	ENSP00000351790.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Dilated cardiomyopathy 1KK Uncertain:1

Apr 21, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces serine with tyrosine at codon 340 of the MYPN protein (p.Ser340Tyr). The serine residue is highly conserved and there is a large physicochemical difference between serine and tyrosine. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a MYPN-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, this variant is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. -

Cardiovascular phenotype Uncertain:1

Apr 23, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.S340Y variant (also known as c.1019C>A), located in coding exon 2 of the MYPN gene, results from a C to A substitution at nucleotide position 1019. The serine at codon 340 is replaced by tyrosine, an amino acid with dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.47
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.24
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.090	.;.;.;T;.
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.88	D;D;.;D;D
M_CAP	Benign	0.057	D
MetaRNN	Pathogenic	0.83	D;D;D;D;D
MetaSVM	Uncertain	-0.12	T
MutationAssessor	Benign	1.7	L;.;L;.;L
PhyloP100		7.8
PrimateAI	Uncertain	0.78	T
PROVEAN	Uncertain	-2.7	D;D;D;.;D
REVEL	Uncertain	0.51
Sift	Uncertain	0.0010	D;D;D;.;D
Sift4G	Uncertain	0.0040	D;D;D;D;D
Polyphen		1.0	D;D;D;.;D
Vest4		0.89
MutPred		0.66		Loss of phosphorylation at S340 (P = 0.1062);.;Loss of phosphorylation at S340 (P = 0.1062);.;Loss of phosphorylation at S340 (P = 0.1062);
MVP		0.88
MPC		0.69
ClinPred		0.98	D
GERP RS		5.6
Varity_R		0.72
gMVP		0.74
Mutation Taster		=21/79	disease causing

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

Other links and lift over

dbSNP: rs777080663; hg19: chr10-69902813;