5-140639818-G-T

Variant names:

• chr5-140639818-G-T
• rs775506005
• NM_018502.5:c.165G>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001300982.2(TMCO6):​c.-267G>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,457,330 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: TMCO6 NM_001300982.2 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0530
• 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: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.045893222).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001300982.2. 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.165G>T	p.Glu55Asp	missense	Exon 2 of 12	NP_060972.3
	TMCO6	NM_001300982.2		c.-267G>T		5_prime_UTR_premature_start_codon_gain	Exon 2 of 10	NP_001287911.1
	TMCO6	NM_001300980.2		c.165G>T	p.Glu55Asp	missense	Exon 2 of 12	NP_001287909.1	Q96DC7-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TMCO6	ENST00000394671.8	TSL:2 MANE Select	c.165G>T	p.Glu55Asp	missense	Exon 2 of 12	ENSP00000378166.3	Q96DC7-1
	TMCO6	ENST00000252100.6	TSL:1	c.165G>T	p.Glu55Asp	missense	Exon 2 of 12	ENSP00000252100.6	Q96DC7-2
	TMCO6	ENST00000513002.5	TSL:3	c.-163G>T		5_prime_UTR_premature_start_codon_gain	Exon 2 of 4	ENSP00000421613.2	D6REY4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1457330 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 724380

African (AFR) AF: 0.0000299 AC: 1 AN: 33450

American (AMR) AF: 0.00 AC: 0 AN: 43980

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25950

East Asian (EAS) AF: 0.00 AC: 0 AN: 39554

South Asian (SAS) AF: 0.00 AC: 0 AN: 84944

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53012

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5642

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1110584

Other (OTH) AF: 0.00 AC: 0 AN: 60214

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.069
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.71
CADD	Benign	10
DANN	Benign	0.84
DEOGEN2	Benign	0.0077	T
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.16	N
LIST_S2	Benign	0.70	T
M_CAP	Benign	0.0072	T
MetaRNN	Benign	0.046	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.2	L
PhyloP100		0.053
PrimateAI	Benign	0.30	T
PROVEAN	Benign	0.18	N
REVEL	Benign	0.025
Sift	Benign	0.61	T
Sift4G	Benign	0.50	T
Polyphen		0.0	B
Vest4		0.054
MutPred		0.30		Loss of helix (P = 0.079)
MVP		0.34
MPC		0.18
ClinPred		0.036	T
GERP RS		-0.20
PromoterAI		0.050	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.042
gMVP		0.089
Mutation Taster		=97/3	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: rs775506005; hg19: chr5-140019403;