chr6-75841299-A-G

Position:

• chr6-75841299-A-G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PS1_Moderate PP3_Strong PP5_Very_Strong

The NM_004999.4(MYO6):​c.737A>G​(p.His246Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000315 in 1,461,670 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin UniProt.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000031 (0 hom.)
• Consequence: MYO6 NM_004999.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 8.92

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]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PS1: Transcript NM_004999.4 (MYO6) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.966
• PP5: Variant 6-75841299-A-G is Pathogenic according to our data. Variant chr6-75841299-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 8581.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYO6	NM_004999.4	c.737A>G	p.His246Arg	missense_variant	9/35	ENST00000369977.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYO6	ENST00000369977.8	c.737A>G	p.His246Arg	missense_variant	9/35	1	NM_004999.4	A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 250992 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135728

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000315 AC: 46 AN: 1461670 Hom.: 0 Cov.: 31 AF XY: 0.0000261 AC XY: 19 AN XY: 727146

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000396

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000710 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Jun 17, 2024	Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 18212818, 18348273, 29044474, 29224747, 34662886, 15060111, 36788145) -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 03, 2024	This sequence change replaces histidine, which is basic and polar, with arginine, which is basic and polar, at codon 246 of the MYO6 protein (p.His246Arg). This variant is present in population databases (rs121912560, gnomAD 0.003%). This missense change has been observed in individual(s) with autosomal dominant deafness (PMID: 15060111). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 8581). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt MYO6 protein function with a positive predictive value of 80%. For these reasons, this variant has been classified as Pathogenic. -

Progressive sensorineural hearing loss-hypertrophic cardiomyopathy syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Apr 01, 2004

- -

Rare genetic deafness Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jul 30, 2015

The p.His246Arg variant in MYO6 has been reported in one individual with progres sive, post-lingual sensorineural hearing loss and left ventricular hypertrophy ( LVH), and it segregated with hearing loss in 9 affected relatives (Mohiddin 2004 ). Two family members (ages 12 and 28 years) carried the variant but did not hav e hearing loss, which may reflect reduced penetrance or variable onset. Alternat ively, of the 11 family members that carried the p.His246Arg variant, only 4 ind ividuals presented with cardiac hypertrophy, while another 3 family members were reported to have an abnormal ECG. While this could also indicate reduced penetr ance of LVH, given that no other variant in the MYO6 gene has been associated wi th cardiac hypertrophy, it is possible that the LVH in the family is caused by a n unrelated etiology. Of note, one family member who did not carry the variant a nd did not have sensorineural hearing loss was reported to have LVH which indica tes that this MYO6 variant does not segregate with that manifestation; however, the authors attributed this individual's cardiac features to valvar and ischaemi c disease. The variant was absent in population databases. In summary, although additional studies are required to fully establish its clinical significance, th is variant is likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.50
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.90	D;.;.;.;D;D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.95
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D;.;D;D;D;D
M_CAP	Pathogenic	0.43	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.5	.;H;H;H;.;.
MutationTaster	Benign	1.0	A;A;A;A
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-7.8	D;D;D;.;D;.
REVEL	Pathogenic	0.93
Sift	Pathogenic	0.0	D;D;D;.;D;.
Sift4G	Pathogenic	0.0	D;D;D;D;D;D
Polyphen		1.0, 0.99	.;D;D;D;.;.
Vest4		1.0
MVP		0.96
MPC		0.32
ClinPred		1.0	D
GERP RS		5.3
gMVP		0.93

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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

Other links and lift over

dbSNP: rs121912560; hg19: chr6-76551016;