NM_000124.4:c.1659G>T

Variant names:

• chr10-49500564-C-A
• rs116373975
• NM_000124.4:c.1659G>T

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 0P and 7B. BP4_Moderate BS1_Supporting BS2

The NM_000124.4(ERCC6):​c.1659G>T​(p.Lys553Asn) variant causes a missense change. The variant allele was found at a frequency of 0.000178 in 1,613,944 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00017 (1 hom., cov: 32)
  • Exomes 𝑓: 0.00018 (2 hom.)
• Consequence: ERCC6 NM_000124.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:10
• Conservation: PhyloP100: 3.94

Genes affected

ERCC6 (HGNC:3438): (ERCC excision repair 6, chromatin remodeling factor) This gene encodes a DNA-binding protein that is important in transcription-coupled excision repair. The encoded protein has ATP-stimulated ATPase activity, interacts with several transcription and excision repair proteins, and may promote complex formation at DNA repair sites. Mutations in this gene are associated with Cockayne syndrome type B and cerebrooculofacioskeletal syndrome 1. Alternative splicing occurs between a splice site from exon 5 of this gene to the 3' splice site upstream of the open reading frame (ORF) of the adjacent gene, piggyback-derived-3 (GeneID:267004), which activates the alternative polyadenylation site downstream of the piggyback-derived-3 ORF. The resulting transcripts encode a fusion protein that shares sequence with the product of each individual gene. [provided by RefSeq, Mar 2016]

ACMG classification

Verdict is Benign. Variant got -7 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.12501672).
• BS1: Variant frequency is greater than expected in population mid. gnomad4_exome allele frequency = 0.000179 (262/1461648) while in subpopulation MID AF= 0.00817 (47/5756). AF 95% confidence interval is 0.00631. There are 2 homozygotes in gnomad4_exome. There are 149 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAdExome4 at 2 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ERCC6	NM_000124.4	c.1659G>T	p.Lys553Asn	missense_variant	Exon 7 of 21	ENST00000355832.10	NP_000115.1
ERCC6	NM_001346440.2	c.1659G>T	p.Lys553Asn	missense_variant	Exon 7 of 21		NP_001333369.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ERCC6	ENST00000355832.10	c.1659G>T	p.Lys553Asn	missense_variant	Exon 7 of 21	1	NM_000124.4	ENSP00000348089.5

Frequencies

GnomAD3 genomes AF: 0.000164 AC: 25 AN: 152178 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000196

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000250

Gnomad OTH AF: 0.00144

GnomAD3 exomes AF: 0.000195 AC: 49 AN: 251062 Hom.: 0 AF XY: 0.000236 AC XY: 32 AN XY: 135670

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000376

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad SAS exome AF: 0.0000980

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000229

Gnomad OTH exome AF: 0.000980

GnomAD4 exome AF: 0.000179 AC: 262 AN: 1461648 Hom.: 2 Cov.: 31 AF XY: 0.000205 AC XY: 149 AN XY: 727120

Gnomad4 AFR exome AF: 0.000299

Gnomad4 AMR exome AF: 0.000313

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000139

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000138

Gnomad4 OTH exome AF: 0.000397

GnomAD4 genome AF: 0.000171 AC: 26 AN: 152296 Hom.: 1 Cov.: 32 AF XY: 0.000121 AC XY: 9 AN XY: 74464

Gnomad4 AFR AF: 0.0000481

Gnomad4 AMR AF: 0.000196

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000250

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.000211 Hom.: 0

Bravo AF: 0.000166

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ExAC AF: 0.000222 AC: 27

Asia WGS AF: 0.000577 AC: 2 AN: 3478

EpiCase AF: 0.000382

EpiControl AF: 0.000415

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:10

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:4

Feb 13, 2017

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The K553N variant in the ERCC6 gene has not been reported previously as a pathogenic variant, nor as a benign variant, to our knowledge. The K553N variant was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The K553N variant is a semi-conservative amino acid substitution, which may impact secondary protein structure as these residues differ in some properties. This substitution occurs at a position where amino acids with similar properties to lysine are tolerated across species. In silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. We interpret K553N as a variant of uncertain significance. -

Oct 31, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces lysine, which is basic and polar, with asparagine, which is neutral and polar, at codon 553 of the ERCC6 protein (p.Lys553Asn). This variant is present in population databases (rs116373975, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with ERCC6-related conditions. ClinVar contains an entry for this variant (Variation ID: 190151). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ERCC6 protein function. 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. -

Dec 22, 2015

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

not specified Uncertain:1

Jul 29, 2013

Claritas Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cerebrooculofacioskeletal syndrome 1;C0242379:Lung cancer;C0265201:DE SANCTIS-CACCHIONE SYNDROME;C0751038:Cockayne syndrome type 2;C3151063:Age related macular degeneration 5;C3551173:UV-sensitive syndrome 1;C4310783:Premature ovarian failure 11 Uncertain:1

May 18, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

ERCC6-related disorder Uncertain:1

Nov 17, 2023

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The ERCC6 c.1659G>T variant is predicted to result in the amino acid substitution p.Lys553Asn. To our knowledge, this variant has not been reported in the literature. This variant is reported in 0.037% of alleles in individuals of Latino descent in gnomAD (http://gnomad.broadinstitute.org/variant/10-50708610-C-A). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Cerebrooculofacioskeletal syndrome 1 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Age related macular degeneration 5 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Cockayne syndrome type 2 Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.15
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.49	T
Eigen	Benign	0.043
Eigen_PC	Uncertain	0.26
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.069	D
MetaRNN	Benign	0.13	T
MetaSVM	Uncertain	0.0043	D
MutationAssessor	Benign	0.29	N
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-1.8	N
REVEL	Uncertain	0.36
Sift	Benign	0.22	T
Sift4G	Benign	0.34	T
Polyphen		0.43	B
Vest4		0.52
MutPred		0.62		Loss of MoRF binding (P = 0.0377);
MVP		0.83
MPC		0.13
ClinPred		0.018	T
GERP RS		5.9
Varity_R		0.23
gMVP		0.86

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		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: rs116373975; hg19: chr10-50708610; COSMIC: COSV105916871; COSMIC: COSV105916871;