rs756953958

Positions:

chr17-10544100-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2PP2PP3_StrongPP5

The NM_017534.6(MYH2):c.533C>T(p.Thr178Ile) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000149 in 1,613,914 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 13/23 in silico tools predict a damaging outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000015 ( 0 hom. )

Consequence

MYH2
NM_017534.6 missense, splice_region

Scores

Splicing: ADA: 0.9790

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:2

Conservation

PhyloP100: 10.0

Variant links:

Genes affected

MYH2 (HGNC:7572): (myosin heavy chain 2) Myosins are actin-based motor proteins that function in the generation of mechanical force in eukaryotic cells. Muscle myosins are heterohexamers composed of 2 myosin heavy chains and 2 pairs of nonidentical myosin light chains. This gene encodes a member of the class II or conventional myosin heavy chains, and functions in skeletal muscle contraction. This gene is found in a cluster of myosin heavy chain genes on chromosome 17. A mutation in this gene results in inclusion body myopathy-3. Multiple alternatively spliced variants, encoding the same protein, have been identified. [provided by RefSeq, Sep 2009]

MYH2 links:

MYHAS (HGNC:):

MYHAS links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), MYH2. . Gene score misZ 1.9724 (greater than the threshold 3.09). Trascript score misZ 4.733 (greater than threshold 3.09). GenCC has associacion of gene with childhood-onset autosomal recessive myopathy with external ophthalmoplegia, hereditary inclusion body myopathy-joint contractures-ophthalmoplegia syndrome, myopathy, proximal, and ophthalmoplegia.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.961

PP5

Variant 17-10544100-G-A is Pathogenic according to our data. Variant chr17-10544100-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 183667.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
MYH2	NM_017534.6 linkuse as main transcript	c.533C>T	p.Thr178Ile	missense_variant, splice_region_variant	6/40	ENST00000245503.10	NP_060004.3
MYHAS	NR_125367.1 linkuse as main transcript	n.168-23437G>A		intron_variant, non_coding_transcript_variant
MYH2	NM_001100112.2 linkuse as main transcript	c.533C>T	p.Thr178Ile	missense_variant, splice_region_variant	6/40		NP_001093582.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYH2	ENST00000245503.10 linkuse as main transcript	c.533C>T	p.Thr178Ile	missense_variant, splice_region_variant	6/40	1	NM_017534.6	ENSP00000245503	P1	Q9UKX2-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152132

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000798

AC:

AN:

250774

Hom.:

AF XY:

0.00000738

AC XY:

AN XY:

135498

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000884

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000151

AC:

AN:

1461782

Hom.:

Cov.:

AF XY:

0.0000165

AC XY:

AN XY:

727192

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000928

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000117

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152132

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74300

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000192

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Myopathy, proximal, and ophthalmoplegia

Pathogenic:2Uncertain:1

Pathogenic, criteria provided, single submitter	clinical testing	Mendelics	May 04, 2022	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jun 01, 2014	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 17, 2023	This variant is present in population databases (rs756953958, gnomAD 0.007%). 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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 183667). This missense change has been observed in individual(s) with proximal myopathy with ophthalmoplegia (PMID: 24193343). This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 178 of the MYH2 protein (p.Thr178Ile). -

MYH2-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 12, 2023

The MYH2 c.533C>T variant is predicted to result in the amino acid substitution p.Thr178Ile. This variant has been reported in the homozygous state in an individual with autosomal recessive myosin myopathy with external ophthalmoplegia (Tajsharghi. 2014. PubMed ID: 24193343). The patient’s parents were heterozygous for the variant and were reported to be unaffected. This variant is reported in 0.0062% of alleles in individuals of African descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Pathogenic

0.35

BayesDel_noAF

Pathogenic

0.44

CADD

Pathogenic

DANN

Benign

0.93

DEOGEN2

Pathogenic

0.80

.;D;D;.;.;.

Eigen

Pathogenic

1.2

Eigen_PC

Pathogenic

1.1

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Uncertain

0.89

.;.;D;D;D;D

M_CAP

Pathogenic

0.72

MetaRNN

Pathogenic

0.96

D;D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Pathogenic

3.6

H;H;H;H;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Pathogenic

0.94

PROVEAN

Pathogenic

-4.7

D;D;D;.;.;D

REVEL

Pathogenic

0.95

Sift

Pathogenic

0.0

D;D;D;.;.;D

Sift4G

Pathogenic

0.0

D;D;D;D;D;.

Polyphen

1.0

.;D;D;.;.;.

Vest4

0.92

MutPred

0.83

Loss of disorder (P = 0.0599);Loss of disorder (P = 0.0599);Loss of disorder (P = 0.0599);Loss of disorder (P = 0.0599);.;Loss of disorder (P = 0.0599);

MVP

0.97

MPC

1.8

ClinPred

0.98

GERP RS

5.6

Varity_R

0.88

gMVP

0.86

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

0.98

dbscSNV1_RF

Benign

0.65

SpliceAI score (max)

0.010

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over