1-6425011-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_031475.3(ESPN):c.56G>A(p.Arg19Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000545 in 1,468,372 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.000033 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0000023 (0 hom.)
• Consequence: ESPN NM_031475.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.407

Genes affected

ESPN (HGNC:13281): (espin) This gene encodes a multifunctional actin-bundling protein. It plays a major role in regulating the organization, dimensions, dynamics, and signaling capacities of the actin filament-rich, microvillus-type specializations that mediate sensory transduction in various mechanosensory and chemosensory cells. Mutations in this gene are associated with autosomal recessive neurosensory deafness, and autosomal dominant sensorineural deafness without vestibular involvement. [provided by RefSeq, Nov 2009]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.10000178).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ESPN	NM_031475.3	c.56G>A	p.Arg19Lys	missense_variant	1/13	ENST00000645284.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ESPN	ENST00000645284.1	c.56G>A	p.Arg19Lys	missense_variant	1/13		NM_031475.3	P1
ESPN	ENST00000636330.1	c.56G>A	p.Arg19Lys	missense_variant	1/11	5

Frequencies

GnomAD3 genomes AF: 0.0000329 AC: 5 AN: 151900 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000121

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 AF: 0.00000228 AC: 3 AN: 1316472 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 648988

Gnomad4 AFR exome AF: 0.0000757

Gnomad4 AMR exome AF: 0.0000380

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000329 AC: 5 AN: 151900 Hom.: 0 Cov.: 33 AF XY: 0.0000404 AC XY: 3 AN XY: 74192

Gnomad4 AFR AF: 0.000121

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

Alfa AF: 0.000142 Hom.: 0

Bravo AF: 0.0000567

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jun 26, 2020	In silico analysis, which includes protein predictors and evolutionary conservation, supports that this variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Jun 13, 2022	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. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The lysine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. ClinVar contains an entry for this variant (Variation ID: 1311449). This variant has not been reported in the literature in individuals affected with ESPN-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.02%). This sequence change replaces arginine, which is basic and polar, with lysine, which is basic and polar, at codon 19 of the ESPN protein (p.Arg19Lys). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.078
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.57
Cadd	Benign	9.3
Dann	Benign	0.91
DEOGEN2	Benign	0.024	T;T;T
Eigen	Benign	-0.85
Eigen_PC	Benign	-0.75
FATHMM_MKL	Benign	0.25	N
M_CAP	Pathogenic	0.44	D
MetaRNN	Benign	0.10	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.63	N;.;N
MutationTaster	Benign	0.79	N
PrimateAI	Pathogenic	0.87	D
Polyphen		0.0	B;.;B
Vest4		0.080
MutPred		0.45		Gain of ubiquitination at R19 (P = 0.0408);Gain of ubiquitination at R19 (P = 0.0408);Gain of ubiquitination at R19 (P = 0.0408);
MVP		0.18
MPC		0.15
ClinPred		0.066	T
GERP RS		0.63
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.074
gMVP		0.24

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: rs996170464; hg19: chr1-6485071;