chr6-75858903-G-C

Variant names:

• chr6-75858903-G-C
• rs727504548
• NM_004999.4:c.1383G>C

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_004999.4(MYO6):​c.1383G>C​(p.Glu461Asp) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E461G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYO6 NM_004999.4 missense, splice_region
• Scores: Splicing: ADA: 0.09025
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.862
• Publications: 0 publications found

Genes affected

MYO6 (HGNC:7605): (myosin VI) This gene encodes a reverse-direction motor protein that moves toward the minus end of actin filaments and plays a role in intracellular vesicle and organelle transport. The protein consists of a motor domain containing an ATP- and an actin-binding site and a globular tail which interacts with other proteins. This protein maintains the structural integrity of inner ear hair cells and mutations in this gene cause non-syndromic autosomal dominant and recessive hearing loss. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Jul 2014]

MYO6 Gene-Disease associations (from GenCC):

• autosomal dominant nonsyndromic hearing loss 22

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), PanelApp Australia
• nonsyndromic genetic hearing loss

  Inheritance: AD, AR Classification: DEFINITIVE, MODERATE Submitted by: ClinGen, G2P
• autosomal recessive nonsyndromic hearing loss 37

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae), Ambry Genetics
• autosomal dominant nonsyndromic hearing loss

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• progressive sensorineural hearing loss-hypertrophic cardiomyopathy syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.962
• PP5: Variant 6-75858903-G-C is Pathogenic according to our data. Variant chr6-75858903-G-C is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 178931.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004999.4. 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
	MYO6	NM_004999.4	MANE Select	c.1383G>C	p.Glu461Asp	missense splice_region	Exon 14 of 35	NP_004990.3
	MYO6	NM_001368865.1		c.1383G>C	p.Glu461Asp	missense splice_region	Exon 14 of 36	NP_001355794.1
	MYO6	NM_001368866.1		c.1383G>C	p.Glu461Asp	missense splice_region	Exon 14 of 35	NP_001355795.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYO6	ENST00000369977.8	TSL:1 MANE Select	c.1383G>C	p.Glu461Asp	missense splice_region	Exon 14 of 35	ENSP00000358994.3
	MYO6	ENST00000615563.4	TSL:1	c.1383G>C	p.Glu461Asp	missense splice_region	Exon 13 of 32	ENSP00000478013.1
	MYO6	ENST00000664640.1		c.1383G>C	p.Glu461Asp	missense splice_region	Exon 14 of 36	ENSP00000499278.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 27

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Rare genetic deafness Pathogenic:1

May 04, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Glu461Asp variant in MYO6 has been identified by our laboratory in one ind ividual with hearing loss and segregated in three affected relatives. This vari ant was absent from large population studies. Computational prediction tools and conservation analyses suggest that the p.Glu461Asp variant may impact the prote in, though this information is not predictive enough to determine pathogenicity. In summary, although additional studies are required to fully establish its cli nical significance, this variant is likely pathogenic for autosomal dominant hea ring loss.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.33
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.90	D
Eigen	Pathogenic	0.75
Eigen_PC	Uncertain	0.62
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.91	D
M_CAP	Pathogenic	0.31	D
MetaRNN	Pathogenic	0.96	D
MetaSVM	Uncertain	0.63	D
MutationAssessor	Pathogenic	4.7	H
PhyloP100		0.86
PrimateAI	Pathogenic	0.88	D
PROVEAN	Uncertain	-2.9	D
REVEL	Pathogenic	0.84
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.99	D
Vest4		0.86
MutPred		0.88		Gain of catalytic residue at N466 (P = 0.2834)
MVP		0.83
MPC		0.24
ClinPred		1.0	D
GERP RS		4.3
gMVP		0.88
Mutation Taster		=29/71	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.090
dbscSNV1_RF	Benign	0.26
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

Other links and lift over

dbSNP: rs727504548; hg19: chr6-76568620;