chr17-18146035-G-A

Position:

• chr17-18146035-G-A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PP3 PP5

The NM_016239.4(MYO15A):​c.6437G>A​(p.Arg2146Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000164 in 1,461,592 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).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000016 (0 hom.)
• Consequence: MYO15A NM_016239.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:2
• Conservation: PhyloP100: 7.88

Genes affected

MYO15A (HGNC:7594): (myosin XVA) This gene encodes an unconventional myosin. This protein differs from other myosins in that it has a long N-terminal extension preceding the conserved motor domain. Studies in mice suggest that this protein is necessary for actin organization in the hair cells of the cochlea. Mutations in this gene have been associated with profound, congenital, neurosensory, nonsyndromal deafness. This gene is located within the Smith-Magenis syndrome region on chromosome 17. Read-through transcripts containing an upstream gene and this gene have been identified, but they are not thought to encode a fusion protein. Several alternatively spliced transcript variants have been described, but their full length sequences have not been determined. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a domain MyTH4 1 (size 152) in uniprot entity MYO15_HUMAN there are 8 pathogenic changes around while only 2 benign (80%) in NM_016239.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.799
• PP5: Variant 17-18146035-G-A is Pathogenic according to our data. Variant chr17-18146035-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 228275.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=2, Uncertain_significance=2}. Variant chr17-18146035-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYO15A	NM_016239.4	c.6437G>A	p.Arg2146Gln	missense_variant	30/66	ENST00000647165.2	NP_057323.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYO15A	ENST00000647165.2	c.6437G>A	p.Arg2146Gln	missense_variant	30/66		NM_016239.4	ENSP00000495481	P1
MYO15A	ENST00000578999.1	n.22G>A		non_coding_transcript_exon_variant	1/4	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000121 AC: 3 AN: 248620 Hom.: 0 AF XY: 0.0000148 AC XY: 2 AN XY: 135148

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000290

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000556

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000889

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000164 AC: 24 AN: 1461592 Hom.: 0 Cov.: 31 AF XY: 0.0000138 AC XY: 10 AN XY: 727114

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000198

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000151

ExAC AF: 0.00000825 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Rare genetic deafness Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Mar 08, 2016

The p.Arg2146Gln variant in MYO15A has been reported in 1 Asian individual with autosomal recessive nonsyndromic hearing loss, and segregated with disease in 1 affected family member. Both siblings were compound heterozygous for this varian t and a reportedly pathogenic variant (c.4320+1G>A; Woo 2013). This variant has been identified in 1/65676 European chromosomes by the Exome Aggregation Consort ium (ExAC, http://exac.broadinstitute.org; dbSNP rs760980785). Although this var iant has been seen in the general population, its frequency is low enough to be consistent with a recessive carrier frequency. Computational prediction tools an d conservation analyses suggest that the p.Arg2146Gln variant may impact the pro tein, though this information alone is not predictive enough to determine pathog enicity. In summary, although additional studies are required to fully establish its clinical significance, this variant is likely pathogenic. -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Sep 27, 2022

Variant summary: MYO15A c.6437G>A (p.Arg2146Gln) results in a conservative amino acid change located in the MyTH4 domain (IPR000857) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.2e-05 in 248620 control chromosomes (gnomAD). c.6437G>A has been reported in the literature in compound heterozygous state in two siblings, who carried a likely pathogenic variant in trans, and were affected with profound, bilateral nonsyndromic hearing loss (Woo_2013), in addition the variant was also reported in heterozygous state (i.e. without specifying a variant in trans) in an individual with nonsyndromic hearing loss in the setting of a multigene panel testing (Sloan-Heggen_2015). These data indicate that the variant may be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. One clinical diagnostic laboratory has submitted a clinical-significance assessment for this variant to ClinVar after 2014 and classified the variant as likely pathogenic. Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

Autosomal recessive nonsyndromic hearing loss 3 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Apr 07, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Uncertain	0.048	T
BayesDel_noAF	Uncertain	0.0
CADD	Pathogenic	30
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.31	T;D;D
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	D;.;D
M_CAP	Pathogenic	0.50	D
MetaRNN	Pathogenic	0.80	D;D;D
MetaSVM	Pathogenic	0.99	D
MutationAssessor	Pathogenic	3.1	.;M;M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.51	T
PROVEAN	Uncertain	-3.9	.;D;.
REVEL	Pathogenic	0.82
Sift	Uncertain	0.0070	.;D;.
Sift4G	Pathogenic	0.0	D;D;.
Polyphen		1.0	.;D;D
Vest4		0.52
MutPred		0.66		Gain of catalytic residue at R2146 (P = 0.0204);Gain of catalytic residue at R2146 (P = 0.0204);Gain of catalytic residue at R2146 (P = 0.0204);
MVP		0.95
ClinPred		0.96	D
GERP RS		5.5
Varity_R		0.77
gMVP		0.88

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: rs760980785; hg19: chr17-18049349;