chr5-140642360-G-A

Variant names:

• chr5-140642360-G-A
• rs781676399
• NM_018502.5:c.544G>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_018502.5(TMCO6):​c.544G>A​(p.Ala182Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,540 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A182S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: TMCO6 NM_018502.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.32
• Publications: 0 publications found

Genes affected

TMCO6 (HGNC:28814): (transmembrane and coiled-coil domains 6) Predicted to enable nuclear import signal receptor activity. Predicted to be involved in protein import into nucleus. Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

NDUFA2 (HGNC:7685): (NADH:ubiquinone oxidoreductase subunit A2) The encoded protein is a subunit of the hydrophobic protein fraction of the NADH:ubiquinone oxidoreductase (complex 1), the first enzyme complex in the electron transport chain located in the inner mitochondrial membrane, and may be involved in regulating complex I activity or its assembly via assistance in redox processes. Mutations in this gene are associated with Leigh syndrome, an early-onset progressive neurodegenerative disorder. Alternative splicing results in multiple transcript variants.[provided by RefSeq, May 2010]

NDUFA2 Gene-Disease associations (from GenCC):

• mitochondrial disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• mitochondrial complex I deficiency, nuclear type 13

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• Leigh syndrome

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen
• cystic leukoencephalopathy without megalencephaly

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Leigh syndrome with leukodystrophy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.16727316).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018502.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TMCO6	NM_018502.5	MANE Select	c.544G>A	p.Ala182Thr	missense	Exon 5 of 12	NP_060972.3
	TMCO6	NM_001300980.2		c.544G>A	p.Ala182Thr	missense	Exon 5 of 12	NP_001287909.1	Q96DC7-2
	TMCO6	NM_001300982.2		c.-117-226G>A		intron	N/A	NP_001287911.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TMCO6	ENST00000394671.8	TSL:2 MANE Select	c.544G>A	p.Ala182Thr	missense	Exon 5 of 12	ENSP00000378166.3	Q96DC7-1
	TMCO6	ENST00000252100.6	TSL:1	c.544G>A	p.Ala182Thr	missense	Exon 5 of 12	ENSP00000252100.6	Q96DC7-2
	TMCO6	ENST00000510336.5	TSL:1	n.705G>A		non_coding_transcript_exon	Exon 3 of 10

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000283 AC: 7 AN: 247776 AF XY: 0.00000743

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000334

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.000166

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461540 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727048

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44672

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26112

East Asian (EAS) AF: 0.000101 AC: 4 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86188

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53398

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111858

Other (OTH) AF: 0.0000166 AC: 1 AN: 60372

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000227

ExAC AF: 0.0000330 AC: 4

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.077
BayesDel_addAF	Benign	-0.35	T
BayesDel_noAF	Benign	-0.44
CADD	Uncertain	24
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.031	T
Eigen	Uncertain	0.46
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.75	T
M_CAP	Benign	0.0083	T
MetaRNN	Benign	0.17	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.8	L
PhyloP100		4.3
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.080
Sift	Benign	0.078	T
Sift4G	Uncertain	0.042	D
Polyphen		0.98	D
Vest4		0.20
MutPred		0.29		Loss of helix (P = 0.0444)
MVP		0.62
MPC		0.20
ClinPred		0.19	T
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.094
gMVP		0.12
Mutation Taster		=79/21	polymorphism

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: rs781676399; hg19: chr5-140021945;