rs1554076306

Variant names:

• chr5-60945256-A-T
• rs1554076306
• NM_174889.5:c.1A>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_174889.5(NDUFAF2):​c.1A>T​(p.Met1?) variant causes a initiator codon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,642 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 Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: NDUFAF2 NM_174889.5 initiator_codon
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 3.10
• Publications: 1 publications found

Genes affected

NDUFAF2 (HGNC:28086): (NADH:ubiquinone oxidoreductase complex assembly factor 2) NADH:ubiquinone oxidoreductase (complex I) catalyzes the transfer of electrons from NADH to ubiquinone (coenzyme Q) in the first step of the mitochondrial respiratory chain, resulting in the translocation of protons across the inner mitochondrial membrane. This gene encodes a complex I assembly factor. Mutations in this gene cause progressive encephalopathy resulting from mitochondrial complex I deficiency. [provided by RefSeq, Jul 2008]

ERCC8 (HGNC:3439): (ERCC excision repair 8, CSA ubiquitin ligase complex subunit) This gene encodes a WD repeat protein, which interacts with Cockayne syndrome type B (CSB) protein and with p44 protein, a subunit of the RNA polymerase II transcription factor IIH. Mutations in this gene have been identified in patients with hereditary disease Cockayne syndrome (CS). CS cells are abnormally sensitive to ultraviolet radiation and are defective in the repair of transcriptionally active genes. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2014]

ERCC8 Gene-Disease associations (from GenCC):

• Cockayne syndrome type 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, Genomics England PanelApp, PanelApp Australia, ClinGen, Myriad Women’s Health, Labcorp Genetics (formerly Invitae), G2P
• UV-sensitive syndrome 2

  Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp
• Cockayne syndrome type 2

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• UV-sensitive syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Start lost variant, next in-frame start position is after 17 pathogenic variants. Next in-frame start position is after 85 codons. Genomic position: 61099027. Lost 0.496 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-60945256-A-T is Pathogenic according to our data. Variant chr5-60945256-A-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 496596.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NDUFAF2	NM_174889.5	c.1A>T	p.Met1?	initiator_codon_variant	Exon 1 of 4	ENST00000296597.10	NP_777549.1
ERCC8	NM_000082.4	c.-248T>A		upstream_gene_variant		ENST00000676185.1	NP_000073.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NDUFAF2	ENST00000296597.10	c.1A>T	p.Met1?	initiator_codon_variant	Exon 1 of 4	1	NM_174889.5	ENSP00000296597.5
ERCC8	ENST00000676185.1	c.-248T>A		upstream_gene_variant			NM_000082.4	ENSP00000501614.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000800 AC: 2 AN: 249882 AF XY: 0.00000740

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000581

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1460642 Hom.: 0 Cov.: 67 AF XY: 0.00000138 AC XY: 1 AN XY: 726558

African (AFR) AF: 0.00 AC: 0 AN: 33446

American (AMR) AF: 0.0000448 AC: 2 AN: 44652

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26116

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86090

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53382

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5120

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111848

Other (OTH) AF: 0.00 AC: 0 AN: 60294

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Jun 29, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. ClinVar contains an entry for this variant (Variation ID: 496596). Disruption of the initiator codon has been observed in individuals with mitochondrial complex I deficiency (PMID: 18180188, 25590979). This variant is not present in population databases (gnomAD no frequency). This sequence change affects the initiator methionine of the NDUFAF2 mRNA. The next in-frame methionine is located at codon 85. -

Mar 26, 2024

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Initiation codon variant in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 18180188, 25590979) -

Mitochondrial complex I deficiency, nuclear type 10 Pathogenic:1

Dec 13, 2018

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Uncertain	24
DANN	Benign	0.94
DEOGEN2	Benign	0.019	T;.
Eigen	Benign	0.031
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Pathogenic	0.63	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Benign	-0.43	T
PhyloP100		3.1
PROVEAN	Benign	-0.77	N;N
REVEL	Uncertain	0.42
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.22	B;.
Vest4		0.96
MutPred		1.0		Loss of disorder (P = 0.1622);Loss of disorder (P = 0.1622);
MVP		0.81
ClinPred		1.0	D
GERP RS		5.4
PromoterAI		-0.025	Neutral
Varity_R		0.97
gMVP		0.32
Mutation Taster		=35/165	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1554076306; hg19: chr5-60241083;