rs1297886521

Positions:

• chr11-77160271-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM2 PM5 PP3_Strong PP5

The NM_000260.4(MYO7A):​c.1189G>A​(p.Ala397Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000779 in 1,411,928 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 Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A397D) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000078 (0 hom.)
• Consequence: MYO7A NM_000260.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 9.95

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]

MYO7A (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-77160272-C-A is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989
• PP5: Variant 11-77160271-G-A is Pathogenic according to our data. Variant chr11-77160271-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 554214.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Pathogenic=1, Likely_pathogenic=1}. Variant chr11-77160271-G-A is described in Lovd as [Pathogenic]. Variant chr11-77160271-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYO7A	NM_000260.4	c.1189G>A	p.Ala397Thr	missense_variant	11/49	ENST00000409709.9	NP_000251.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYO7A	ENST00000409709.9	c.1189G>A	p.Ala397Thr	missense_variant	11/49	1	NM_000260.4	ENSP00000386331.3
MYO7A	ENST00000458637.6	c.1189G>A	p.Ala397Thr	missense_variant	11/49	1		ENSP00000392185.2
MYO7A	ENST00000409619.6	c.1156G>A	p.Ala386Thr	missense_variant	12/50	1		ENSP00000386635.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000779 AC: 11 AN: 1411928 Hom.: 0 Cov.: 31 AF XY: 0.00000717 AC XY: 5 AN XY: 697826

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000265

Gnomad4 ASJ exome AF: 0.0000790

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000736

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 21, 2024	This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 397 of the MYO7A protein (p.Ala397Thr). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This missense change has been observed in individuals with clinical features of Usher syndrome (PMID: 23591405, 28944237; Invitae). ClinVar contains an entry for this variant (Variation ID: 554214). 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 MYO7A protein function with a positive predictive value of 95%. This variant disrupts the p.Ala397 amino acid residue in MYO7A. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 9382091, 18700726, 20497194). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Nov 21, 2022	- -

Usher syndrome type 1;C1838701:Autosomal recessive nonsyndromic hearing loss 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Counsyl

Sep 29, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.43
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.91	D;T;.;.
Eigen	Pathogenic	0.92
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D;D
M_CAP	Pathogenic	0.53	D
MetaRNN	Pathogenic	0.99	D;D;D;D
MetaSVM	Pathogenic	0.94	D
MutationAssessor	Uncertain	2.9	M;.;M;.
PrimateAI	Uncertain	0.76	T
PROVEAN	Uncertain	-3.7	D;.;D;D
REVEL	Pathogenic	0.87
Sift	Pathogenic	0.0	D;.;D;D
Sift4G	Uncertain	0.0040	D;D;D;D
Polyphen		1.0	D;.;.;.
Vest4		0.95
MutPred		0.90		Gain of phosphorylation at A397 (P = 0.0643);Gain of phosphorylation at A397 (P = 0.0643);Gain of phosphorylation at A397 (P = 0.0643);.;
MVP		0.94
MPC		0.41
ClinPred		0.98	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.78
gMVP		0.76

Splicing

Name	Calibrated prediction	Score	Prediction
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

Publications

LitVar

Other links and lift over

dbSNP: rs1297886521; hg19: chr11-76871317;