rs770824805

Variant names:

• chr10-68122186-A-C
• rs770824805
• NM_032578.4:c.748A>C

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_Strong BS2

The NM_032578.4(MYPN):​c.748A>C​(p.Thr250Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000412 in 1,457,596 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: MYPN NM_032578.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: 0.325

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 Benign. Variant got -8 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.049315512).
• BS2: High AC in GnomAdExome4 at 6 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MYPN	NM_032578.4	c.748A>C	p.Thr250Pro	missense_variant	Exon 2 of 20	ENST00000358913.10	NP_115967.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MYPN	ENST00000358913.10	c.748A>C	p.Thr250Pro	missense_variant	Exon 2 of 20	1	NM_032578.4	ENSP00000351790.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000161 AC: 4 AN: 247880 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 133966

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000218

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000412 AC: 6 AN: 1457596 Hom.: 0 Cov.: 31 AF XY: 0.00000414 AC XY: 3 AN XY: 724750

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000151

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Oct 11, 2016

Stanford Center for Inherited Cardiovascular Disease, Stanford University

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: provider interpretation

p.Thr250Pro (c.748A>C) in exon 2 of the MYPN gene (NM_032578.3) We have seen this variant in a person with HCM who also had another very likely pathogenic variant. This variant is located in a gene with limited evidence to link it to HCM and there is no case data for this variant. Therefore, we consider this variant to be of uncertain significance and we do not feel it is suitable for assessing risk in healthy relatives ("predictive genetic testing"). The variant has not been reported in the literature. Per the Invitae report, "This sequence change replaces threonine with proline at codon 250 of the MYPN protein (p.Thr250Pro). The threonine residue is weakly conserved and there is a small physicochemical difference between threonine and Proline...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." The variant was reported online in 4 of 124,213 individuals in the Genome Aggregation Consortium Dataset (gnomAD; http://gnomad.broadinstitute.org/), which currently includes variant calls on 126,216 unrelated individuals of African, Asian, European, Ashkenazi, Latino descent. Specifically, the variant was observed in 4 of 8,649 individuals of East Asian descent (0.02% MAF). The phenotype of those individuals is not publicly available. The dataset is comprised of multiple cohorts, some of which were recruited from the general population, others were enriched for common cardiovascular disease. -

Dilated cardiomyopathy 1KK Uncertain:1

Sep 04, 2016

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, this variant is a rare missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. 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 (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. This variant is present in population databases (rs770824805, ExAC 0.02%) but has not been reported in the literature in individuals with a MYPN-related disease. This sequence change replaces threonine with proline at codon 250 of the MYPN protein (p.Thr250Pro). The threonine residue is weakly conserved and there is a small physicochemical difference between threonine and proline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	16
DANN	Benign	0.96
Eigen	Benign	-0.65
Eigen_PC	Benign	-0.52
FATHMM_MKL	Benign	0.15	N
LIST_S2	Benign	0.54	T;.;T
M_CAP	Benign	0.015	T
MetaRNN	Benign	0.049	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.0	N;N;N
PrimateAI	Benign	0.41	T
PROVEAN	Benign	-0.59	N;N;N
REVEL	Benign	0.10
Sift	Benign	0.21	T;T;T
Sift4G	Benign	0.27	T;T;T
Polyphen		0.17	B;B;B
Vest4		0.51
MutPred		0.18		Loss of phosphorylation at T250 (P = 0.0178);Loss of phosphorylation at T250 (P = 0.0178);Loss of phosphorylation at T250 (P = 0.0178);
MVP		0.53
MPC		0.18
ClinPred		0.021	T
GERP RS		2.1
Varity_R		0.087
gMVP		0.32

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: rs770824805; hg19: chr10-69881943;