NM_017534.6:c.1068G>C

Variant names:

• chr17-10540007-C-G
• rs116419997
• NM_017534.6:c.1068G>C

Variant summary

Our verdict is Benign. The variant received -7 ACMG points: 0P and 7B. BP4_Moderate BP6 BS1

The NM_017534.6(MYH2):​c.1068G>C​(p.Thr356Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000399 in 1,614,028 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. T356T) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0022 (1 hom., cov: 32)
  • Exomes 𝑓: 0.00022 (0 hom.)
• Consequence: MYH2 NM_017534.6 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2
• Conservation: PhyloP100: -0.615
• Publications: 3 publications found

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]

MYHAS (HGNC:50609): (myosin heavy chain gene cluster antisense RNA) Predicted to enable primary miRNA binding activity. Predicted to be involved in response to muscle activity and skeletal muscle fiber development. Predicted to act upstream of or within with a positive effect on gene expression. Predicted to be located in cytoplasm and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Our verdict: Benign. The variant received -7 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.31).
• BP6: Variant 17-10540007-C-G is Benign according to our data. Variant chr17-10540007-C-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 465918.
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00216 (329/152190) while in subpopulation AFR AF = 0.00766 (318/41526). AF 95% confidence interval is 0.00696. There are 1 homozygotes in GnomAd4. There are 159 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017534.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYH2	NM_017534.6	MANE Select	c.1068G>C	p.Thr356Thr	synonymous	Exon 12 of 40	NP_060004.3
	MYH2	NM_001100112.2		c.1068G>C	p.Thr356Thr	synonymous	Exon 12 of 40	NP_001093582.1
	MYHAS	NR_125367.1		n.168-27530C>G		intron	N/A

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYH2	ENST00000245503.10	TSL:1 MANE Select	c.1068G>C	p.Thr356Thr	synonymous	Exon 12 of 40	ENSP00000245503.5
	MYH2	ENST00000532183.6	TSL:1	c.1068G>C	p.Thr356Thr	synonymous	Exon 11 of 17	ENSP00000433944.1
	MYH2	ENST00000622564.4	TSL:1	c.1068G>C	p.Thr356Thr	synonymous	Exon 12 of 18	ENSP00000482463.1

Frequencies

GnomAD3 genomes AF: 0.00214 AC: 326 AN: 152072 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.00761

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000459

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.000956

GnomAD2 exomes AF: 0.000577 AC: 145 AN: 251386 AF XY: 0.000449

Gnomad AFR exome AF: 0.00806

Gnomad AMR exome AF: 0.000318

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000215 AC: 315 AN: 1461838 Hom.: 0 Cov.: 32 AF XY: 0.000190 AC XY: 138 AN XY: 727222

African (AFR) AF: 0.00786 AC: 263 AN: 33480

American (AMR) AF: 0.000313 AC: 14 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.000867 AC: 5 AN: 5768

European-Non Finnish (NFE) AF: 0.00000360 AC: 4 AN: 1111966

Other (OTH) AF: 0.000480 AC: 29 AN: 60394

GnomAD4 genome AF: 0.00216 AC: 329 AN: 152190 Hom.: 1 Cov.: 32 AF XY: 0.00214 AC XY: 159 AN XY: 74394

African (AFR) AF: 0.00766 AC: 318 AN: 41526

American (AMR) AF: 0.000458 AC: 7 AN: 15278

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5166

South Asian (SAS) AF: 0.00 AC: 0 AN: 4824

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10596

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000294 AC: 2 AN: 68008

Other (OTH) AF: 0.000946 AC: 2 AN: 2114

Alfa AF: 0.0000435 Hom.: 0

Bravo AF: 0.00241

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:1

Apr 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

MYH2: BP4, BP7

Jun 10, 2021

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Has not been previously published as pathogenic or benign to our knowledge; In-silico analysis is inconclusive as to whether the variant alters gene splicing. In the absence of RNA/functional studies, the actual effect of this sequence change is unknown.

Myopathy, proximal, and ophthalmoplegia Benign:1

Dec 31, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.31
CADD	Benign	7.0
DANN	Benign	0.72
PhyloP100		-0.61

Splicing

Name	Calibrated prediction	Score	Prediction
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

Other links and lift over

dbSNP: rs116419997; hg19: chr17-10443324;