15-43600623-A-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Moderate BP6_Moderate

The NM_153700.2(STRC):c.4904T>C(p.Val1635Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000132 in 151,918 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V1635F) has been classified as Likely benign.

• Frequency: Genomes: 𝑓 0.000013 (0 hom., cov: 26)
• Consequence: STRC NM_153700.2 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.774

Genes affected

STRC (HGNC:16035): (stereocilin) This gene encodes a protein that is associated with the hair bundle of the sensory hair cells in the inner ear. The hair bundle is composed of stiff microvilli called stereocilia and is involved with mechanoreception of sound waves. This gene is part of a tandem duplication on chromosome 15; the second copy is a pseudogene. Mutations in this gene cause autosomal recessive non-syndromic deafness. [provided by RefSeq, Jul 2008]

CKMT1B (HGNC:1995): (creatine kinase, mitochondrial 1B) Mitochondrial creatine (MtCK) kinase is responsible for the transfer of high energy phosphate from mitochondria to the cytosolic carrier, creatine. It belongs to the creatine kinase isoenzyme family. It exists as two isoenzymes, sarcomeric MtCK and ubiquitous MtCK, encoded by separate genes. Mitochondrial creatine kinase occurs in two different oligomeric forms: dimers and octamers, in contrast to the exclusively dimeric cytosolic creatine kinase isoenzymes. Many malignant cancers with poor prognosis have shown overexpression of ubiquitous mitochondrial creatine kinase; this may be related to high energy turnover and failure to eliminate cancer cells via apoptosis. Ubiquitous mitochondrial creatine kinase has 80% homology with the coding exons of sarcomeric mitochondrial creatine kinase. Two genes located near each other on chromosome 15 have been identified which encode identical mitochondrial creatine kinase proteins. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12211344).
• BP6: Variant 15-43600623-A-G is Benign according to our data. Variant chr15-43600623-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 504929.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
STRC	NM_153700.2	c.4904T>C	p.Val1635Ala	missense_variant	26/29	ENST00000450892.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
STRC	ENST00000450892.7	c.4904T>C	p.Val1635Ala	missense_variant	26/29	5	NM_153700.2	P2

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 151918 Hom.: 0 Cov.: 26

Gnomad AFR AF: 0.0000484

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 32

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 151918 Hom.: 0 Cov.: 26 AF XY: 0.0000135 AC XY: 1 AN XY: 74190

Gnomad4 AFR AF: 0.0000484

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000756

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Apr 08, 2016

p.Val1635Ala in exon 26 of STRC: This variant is not expected to have clinical s ignificance due to a lack of conservation across species, including mammals. Of note 4 mammals (rat, opossum, tasmanian devil, and wallaby) have an alanine (Ala ) at this position despite high nearby amino acid conservation. In addition, com putational prediction tools do not suggest a high likelihood of impact to the pr otein. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
Cadd	Benign	14
Dann	Benign	0.77
DEOGEN2	Benign	0.024	T;.
Eigen	Benign	-0.80
Eigen_PC	Benign	-0.59
FATHMM_MKL	Benign	0.43	N
LIST_S2	Benign	0.54	T;T
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.12	T;T
MetaSVM	Benign	-0.97	T
MutationTaster	Benign	1.0	D;N;N
PrimateAI	Benign	0.46	T
PROVEAN	Benign	0.15	N;N
REVEL	Benign	0.084
Sift	Benign	0.56	T;T
Sift4G	Benign	1.0	T;T
Polyphen		0.0010	B;B
Vest4		0.13
MutPred		0.38		Gain of disorder (P = 0.0582);.;
MVP		0.53
ClinPred		0.040	T
GERP RS		1.1
Varity_R		0.054
gMVP		0.31

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: rs1370498166; hg19: chr15-43892821;