rs1554846764

chr10-68174095-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_032578.4(MYPN):c.2003A>T(p.Asn668Ile) 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 30)
• Consequence: MYPN NM_032578.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: 7.22

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYPN	NM_032578.4	c.2003A>T	p.Asn668Ile	missense_variant	11/20	ENST00000358913.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYPN	ENST00000358913.10	c.2003A>T	p.Asn668Ile	missense_variant	11/20	1	NM_032578.4	P1

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 30

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, no assertion criteria provided

provider interpretation

Stanford Center for Inherited Cardiovascular Disease, Stanford University

Aug 02, 2017

This variant was seen in one patient with ARVC. Testing was performed at Invitae. Given the weak gene-disease association and lack of case data we consider this variant a variant of uncertain significance and we do not feel it is suitable for assessing risk in healthy relatives ("predictive genetic testing"). The MYPN gene is associated with autosomal recessive nemaline myopathy and there's some preliminary evidence associating it with autosomal dominant DCM, HCM and RCM (Purevjav et al. 2012). The variant has not been reported in the literature (per PubMed and Google). 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. The variant is not listed in the Genome Aggregation Consortium Dataset (gnomAD; http://gnomad.broadinstitute.org/), which currently includes variant calls on >140,000 unrelated individuals of African, Asian, European, Latino, and Ashkenazi descent. The average coverage at that site in gnomAD is 90x in exomes and 33x in genomes. -

Dilated cardiomyopathy 1KK Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 16, 2022

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: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C15"). ClinVar contains an entry for this variant (Variation ID: 477745). This variant has not been reported in the literature in individuals affected with MYPN-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces asparagine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 668 of the MYPN protein (p.Asn668Ile). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.64
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.030
Cadd	Benign	22
Dann	Uncertain	0.99
Eigen	Uncertain	0.51
Eigen_PC	Uncertain	0.52
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Uncertain	0.93	D;D;.;D
M_CAP	Benign	0.071	D
MetaRNN	Uncertain	0.56	D;D;D;D
MetaSVM	Benign	-0.30	T
MutationAssessor	Uncertain	2.8	M;.;M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.46	T
PROVEAN	Pathogenic	-4.6	D;D;D;.
REVEL	Uncertain	0.31
Sift	Pathogenic	0.0	D;D;D;.
Sift4G	Uncertain	0.0040	D;D;D;D
Polyphen		0.94	P;D;P;.
Vest4		0.62
MutPred		0.34		Loss of loop (P = 0.0986);.;Loss of loop (P = 0.0986);.;
MVP		0.83
MPC		0.48
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.76
gMVP		0.41

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: rs1554846764; hg19: chr10-69933852;