19-50223080-C-G

Position:

• chr19-50223080-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001145809.2(MYH14):​c.563-3C>G variant causes a splice region, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYH14 NM_001145809.2 splice_region, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.81

Genes affected

MYH14 (HGNC:23212): (myosin heavy chain 14) This gene encodes a member of the myosin superfamily. The protein represents a conventional non-muscle myosin; it should not be confused with the unconventional myosin-14 (MYO14). Myosins are actin-dependent motor proteins with diverse functions including regulation of cytokinesis, cell motility, and cell polarity. Mutations in this gene result in one form of autosomal dominant hearing impairment. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Multiple lines of computational evidence support a deleterious effect 4: Cadd, dbscSNV1_ADA, dbscSNV1_RF, max_spliceai [when BayesDel_noAF, Dann was below the threshold]

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYH14	NM_001145809.2	c.563-3C>G		splice_region_variant, intron_variant		ENST00000642316.2	NP_001139281.1
MYH14	NM_001077186.2	c.563-3C>G		splice_region_variant, intron_variant			NP_001070654.1
MYH14	NM_024729.4	c.563-3C>G		splice_region_variant, intron_variant			NP_079005.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYH14	ENST00000642316.2	c.563-3C>G		splice_region_variant, intron_variant			NM_001145809.2	ENSP00000493594.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jun 22, 2017

Variant classified as Uncertain Significance - Favor Pathogenic. The c.563-3C>G variant in MYH14 has not been previously reported in individuals with hearing lo ss and was absent from large population studies. This variant is located in the 3' splice region. This cytosine (C) nucleotide at this position is well conserve d across species and computational tools suggest an impact to splicing; however, this information is not predictive enough to determine pathogenicity. In summar y, while there is some suspicion for a pathogenic role, the clinical significanc e of this variant is uncertain. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.17
CADD	Pathogenic	26
DANN	Benign	0.97

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.99
SpliceAI score (max)		0.83		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.78		Position offset: 1
DS_AL_spliceai		0.83		Position offset: 3

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1555755418; hg19: chr19-50726337;