chr11-77156069-C-T

Position:

• chr11-77156069-C-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000260.4(MYO7A):​c.448C>T​(p.Arg150Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000411 in 1,461,548 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 Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. R150R) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: MYO7A NM_000260.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 2.44

Genes affected

MYO7A (HGNC:7606): (myosin VIIA) This gene is a member of the myosin gene family. Myosins are mechanochemical proteins characterized by the presence of a motor domain, an actin-binding domain, a neck domain that interacts with other proteins, and a tail domain that serves as an anchor. This gene encodes an unconventional myosin with a very short tail. Defects in this gene are associated with the mouse shaker-1 phenotype and the human Usher syndrome 1B which are characterized by deafness, reduced vestibular function, and (in human) retinal degeneration. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-77156069-C-T is Pathogenic according to our data. Variant chr11-77156069-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 11847.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-77156069-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYO7A	NM_000260.4	c.448C>T	p.Arg150Ter	stop_gained	5/49	ENST00000409709.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYO7A	ENST00000409709.9	c.448C>T	p.Arg150Ter	stop_gained	5/49	1	NM_000260.4
MYO7A	ENST00000458637.6	c.448C>T	p.Arg150Ter	stop_gained	5/49	1		P1
MYO7A	ENST00000409619.6	c.415C>T	p.Arg139Ter	stop_gained	6/50	1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000411 AC: 6 AN: 1461548 Hom.: 0 Cov.: 31 AF XY: 0.00000688 AC XY: 5 AN XY: 727028

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.0000188

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 20, 2023	This sequence change creates a premature translational stop signal (p.Arg150*) in the MYO7A gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in MYO7A are known to be pathogenic (PMID: 8900236, 25404053). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individuals with autosomal recessive Usher syndrome (PMID: 7870171, 28451532). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 11847). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Mar 20, 2020	Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; This variant is associated with the following publications: (PMID: 25525159, 16470552, 28451532, 31479088, 7568224, 7870171, 9002678, 20613545, 31054281, 33576163) -

Usher syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Aug 13, 2020

The p.Arg150X variant in MYO7A has been previously reported in five individuals with Usher syndrome and one individual with sensorineural hearing loss who were either homozygous for the variant or harbored a second pathogenic MYO7A variant in trans (Jaijo 2006 PMID:16470552, Kimberling 2010 PMID:20613545, Nakanishi 2010 PMID:20844544, Asgharzade 2017 PMID:28451532, Ivanova 2018 PMID:30358468, Gao 2019 PMID:31054281, LMM unpublished data). It is absent from large population studies. This nonsense variant leads to a premature termination codon at position 150, which is predicted to lead to a truncated or absent protein. Loss of function of the MYO7A gene is an established disease mechanism in autosomal recessive Usher syndrome. In summary, this variant meets criteria to be classified as pathogenic for autosomal recessive Usher syndrome. ACMG/AMP Criteria applied: PVS1, PM2, PM3, PP4. -

Usher syndrome type 1B Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Oct 10, 1995

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.54	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	38
DANN	Uncertain	1.0
Eigen	Pathogenic	0.82
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.95	D
MutationTaster	Benign	1.0	A;A;A;A
Vest4		0.89
GERP RS		4.3

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

Publications

LitVar

Other links and lift over

dbSNP: rs121965079; hg19: chr11-76867115;