chr11-77211335-C-T

Position:

• chr11-77211335-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_000260.4(MYO7A):​c.6235C>T​(p.Arg2079Trp) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000105 in 1,425,052 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: MYO7A NM_000260.4 missense, splice_region
• Scores: Splicing: ADA: 0.007380
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:4
• Conservation: PhyloP100: 0.274

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 Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.855

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYO7A	NM_000260.4	c.6235C>T	p.Arg2079Trp	missense_variant, splice_region_variant	45/49	ENST00000409709.9	NP_000251.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYO7A	ENST00000409709.9	c.6235C>T	p.Arg2079Trp	missense_variant, splice_region_variant	45/49	1	NM_000260.4	ENSP00000386331.3
MYO7A	ENST00000458637.6	c.6121C>T	p.Arg2041Trp	missense_variant, splice_region_variant	45/49	1		ENSP00000392185.2
MYO7A	ENST00000409619.6	c.6088C>T	p.Arg2030Trp	missense_variant, splice_region_variant	46/50	1		ENSP00000386635.2
MYO7A	ENST00000458169.2	c.3661C>T	p.Arg1221Trp	missense_variant, splice_region_variant	25/29	1		ENSP00000417017.2
MYO7A	ENST00000670577.1	n.*807C>T		splice_region_variant, non_coding_transcript_exon_variant	28/32			ENSP00000499323.1
MYO7A	ENST00000670577.1	n.*807C>T		3_prime_UTR_variant	28/32			ENSP00000499323.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000105 AC: 15 AN: 1425052 Hom.: 0 Cov.: 31 AF XY: 0.0000142 AC XY: 10 AN XY: 705104

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.0000392

Gnomad4 EAS exome AF: 0.0000266

Gnomad4 SAS exome AF: 0.0000124

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000110

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000327 Hom.: 0

Bravo AF: 0.0000151

ExAC AF: 0.00000837 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Usher syndrome type 1B Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Natera, Inc.

Sep 16, 2020

- -

Usher syndrome type 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Myriad Genetics, Inc.

Nov 08, 2021

NM_000260.3(MYO7A):c.6235C>T(R2079W) is a missense variant classified as a variant of uncertain significance in the context of MYO7A-related disorders. R2079W has been observed in cases with relevant disease (PMID: 23967202, 26346818). Functional assessments of this variant are not available in the literature. R2079W has been observed in population frequency databases (gnomAD: EAS 0.01%). In summary, there is insufficient evidence to classify NM_000260.3(MYO7A):c.6235C>T(R2079W) as pathogenic or benign. Please note: this variant was assessed in the context of healthy population screening. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 14, 2022

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 2079 of the MYO7A protein (p.Arg2079Trp). 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 individual(s) with non-syndromic hearing loss (PMID: 26346818). ClinVar contains an entry for this variant (Variation ID: 550490). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Usher syndrome type 1;C1832475:Autosomal dominant nonsyndromic hearing loss 11;C1838701:Autosomal recessive nonsyndromic hearing loss 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Sep 15, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.76
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.23
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.82	D;.;.;D
Eigen	Benign	-0.053
Eigen_PC	Benign	-0.24
FATHMM_MKL	Benign	0.52	D
LIST_S2	Pathogenic	0.98	D;D;D;D
M_CAP	Pathogenic	0.72	D
MetaRNN	Pathogenic	0.86	D;D;D;D
MetaSVM	Uncertain	-0.18	T
MutationAssessor	Pathogenic	3.0	M;.;.;.
PrimateAI	Uncertain	0.70	T
PROVEAN	Pathogenic	-6.8	D;D;D;D
REVEL	Uncertain	0.60
Sift	Uncertain	0.0010	D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D
Polyphen		1.0	D;.;.;.
Vest4		0.86
MVP		0.84
MPC		0.47
ClinPred		0.91	D
GERP RS		-1.3
Varity_R		0.90
gMVP		0.64

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0074
dbscSNV1_RF	Benign	0.14
SpliceAI score (max)		0.22		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.22		Position offset: -2

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

Publications

LitVar

Other links and lift over

dbSNP: rs759614902; hg19: chr11-76922380;