chr11-77147784-C-T

Position:

• chr11-77147784-C-T

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_Strong BP6 BS1 BS2

The NM_000260.4(MYO7A):​c.133-14C>T variant causes a splice polypyrimidine tract, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00125 in 1,608,070 control chromosomes in the GnomAD database, including 33 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0066 (12 hom., cov: 32)
  • Exomes 𝑓: 0.00069 (21 hom.)
• Consequence: MYO7A NM_000260.4 splice_polypyrimidine_tract, intron
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:6
• Conservation: PhyloP100: 2.76

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 Benign. Variant got -13 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.74).
• BP6: Variant 11-77147784-C-T is Benign according to our data. Variant chr11-77147784-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 178476.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=1, Benign=4}. Variant chr11-77147784-C-T is described in Lovd as [Benign].
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0066 (1006/152310) while in subpopulation AFR AF= 0.0227 (942/41582). AF 95% confidence interval is 0.0215. There are 12 homozygotes in gnomad4. There are 453 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 12 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYO7A	NM_000260.4	c.133-14C>T		splice_polypyrimidine_tract_variant, intron_variant		ENST00000409709.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYO7A	ENST00000409709.9	c.133-14C>T		splice_polypyrimidine_tract_variant, intron_variant		1	NM_000260.4
MYO7A	ENST00000409619.6	c.100-14C>T		splice_polypyrimidine_tract_variant, intron_variant		1
MYO7A	ENST00000458637.6	c.133-14C>T		splice_polypyrimidine_tract_variant, intron_variant		1		P1

Frequencies

GnomAD3 genomes AF: 0.00663 AC: 1009 AN: 152192 Hom.: 12 Cov.: 32

Gnomad AFR AF: 0.0228

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00314

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.0000588

Gnomad OTH AF: 0.00431

GnomAD3 exomes AF: 0.00165 AC: 394 AN: 238386 Hom.: 6 AF XY: 0.00129 AC XY: 168 AN XY: 129902

Gnomad AFR exome AF: 0.0260

Gnomad AMR exome AF: 0.000681

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000568

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000925

Gnomad OTH exome AF: 0.00171

GnomAD4 exome AF: 0.000688 AC: 1002 AN: 1455760 Hom.: 21 Cov.: 34 AF XY: 0.000637 AC XY: 461 AN XY: 723434

Gnomad4 AFR exome AF: 0.0257

Gnomad4 AMR exome AF: 0.00102

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000591

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.00140

GnomAD4 genome AF: 0.00660 AC: 1006 AN: 152310 Hom.: 12 Cov.: 32 AF XY: 0.00608 AC XY: 453 AN XY: 74486

Gnomad4 AFR AF: 0.0227

Gnomad4 AMR AF: 0.00314

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000588

Gnomad4 OTH AF: 0.00426

Alfa AF: 0.00573 Hom.: 1

Bravo AF: 0.00750

Asia WGS AF: 0.000866 AC: 3 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:6

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Benign:3

Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Jul 15, 2022	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 30, 2024	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jul 10, 2018	- -

Autosomal recessive nonsyndromic hearing loss 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Apr 30, 2012

133-14C>T in Intron 03 of MYO7A: This variant is not expected to have clinical s ignificance because it has been identified in 2.0% (74/3610) of African American chromosomes from a broad population by the NHLBI Exome Sequencing Project (http ://evs.gs.washington.edu/EVS; dbSNP rs116228809). -

Autosomal dominant nonsyndromic hearing loss 11 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Usher syndrome type 1 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.74
CADD	Benign	1.2
DANN	Benign	0.71

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: rs116228809; hg19: chr11-76858830;