NM_002472.3:c.-31G>T

Variant names:

• chr17-10421663-C-A
• rs2277648
• NM_002472.3:c.-31G>T

Variant summary

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

The NM_002472.3(MYH8):​c.-31G>T variant causes a 5 prime UTR premature start codon gain change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYH8 NM_002472.3 5_prime_UTR_premature_start_codon_gain
• Scores: Splicing: ADA: 0.9993
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.49
• Publications: 11 publications found

Genes affected

MYH8 (HGNC:7578): (myosin heavy chain 8) 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 predominantly expressed in fetal skeletal muscle. This gene is found in a cluster of myosin heavy chain genes on chromosome 17. A mutation in this gene results in trismus-pseudocamptodactyly syndrome. [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: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002472.3. 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
	MYH8	NM_002472.3	MANE Select	c.-31G>T		5_prime_UTR_premature_start_codon_gain	Exon 2 of 40	NP_002463.2
	MYH8	NM_002472.3	MANE Select	c.-31G>T		splice_region	Exon 2 of 40	NP_002463.2
	MYH8	NM_002472.3	MANE Select	c.-31G>T		5_prime_UTR	Exon 2 of 40	NP_002463.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYH8	ENST00000403437.2	TSL:5 MANE Select	c.-31G>T		5_prime_UTR_premature_start_codon_gain	Exon 2 of 40	ENSP00000384330.2
	MYH8	ENST00000403437.2	TSL:5 MANE Select	c.-31G>T		splice_region	Exon 2 of 40	ENSP00000384330.2
	MYH8	ENST00000403437.2	TSL:5 MANE Select	c.-31G>T		5_prime_UTR	Exon 2 of 40	ENSP00000384330.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.23
CADD	Uncertain	23
DANN	Uncertain	0.98
PhyloP100		5.5
PromoterAI		-0.044	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.95
SpliceAI score (max)		0.18		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: rs2277648; hg19: chr17-10324980;