rs139864454

Variant names:

• chr8-73981372-T-C
• rs139864454
• NM_017866.6:c.534T>C

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6 BP7 BS1 BS2

The NM_017866.6(TMEM70):​c.534T>C​(p.Thr178Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000697 in 1,614,216 control chromosomes in the GnomAD database, including 8 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0013 (1 hom., cov: 33)
  • Exomes 𝑓: 0.00063 (7 hom.)
• Consequence: TMEM70 NM_017866.6 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2
• Conservation: PhyloP100: 0.323

Genes affected

TMEM70 (HGNC:26050): (transmembrane protein 70) This gene likely encodes a mitochondrial membrane protein. The encoded protein may play a role in biogenesis of mitochondrial ATP synthase. Mutations in this gene have been associated with neonatal mitochondrial encephalocardiomyopathy due to ATP synthase deficiency. Alternatively spliced transcript variants have been described. [provided by RefSeq, Feb 2010]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.52).
• BP6: Variant 8-73981372-T-C is Benign according to our data. Variant chr8-73981372-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 363691.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Benign=1, Uncertain_significance=1}.
• BP7: Synonymous conserved (PhyloP=0.323 with no splicing effect.
• BS1: Variant frequency is greater than expected in population sas. gnomad4_exome allele frequency = 0.000633 (925/1461866) while in subpopulation SAS AF= 0.000696 (60/86258). AF 95% confidence interval is 0.000554. There are 7 homozygotes in gnomad4_exome. There are 468 alleles in male gnomad4_exome subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAdExome4 at 7 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMEM70	NM_017866.6	c.534T>C	p.Thr178Thr	synonymous_variant	Exon 3 of 3	ENST00000312184.6	NP_060336.3
TMEM70	NM_001040613.3	c.*224T>C		3_prime_UTR_variant	Exon 3 of 3		NP_001035703.1
TMEM70	NR_033334.2	n.714T>C		non_coding_transcript_exon_variant	Exon 4 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMEM70	ENST00000312184.6	c.534T>C	p.Thr178Thr	synonymous_variant	Exon 3 of 3	1	NM_017866.6	ENSP00000312599.5

Frequencies

GnomAD3 genomes AF: 0.00131 AC: 200 AN: 152232 Hom.: 1 Cov.: 33

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000621

Gnomad FIN AF: 0.0171

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000132

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.00159 AC: 399 AN: 251454 Hom.: 6 AF XY: 0.00156 AC XY: 212 AN XY: 135896

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000867

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.000523

Gnomad FIN exome AF: 0.0165

Gnomad NFE exome AF: 0.000141

Gnomad OTH exome AF: 0.000652

GnomAD4 exome AF: 0.000633 AC: 925 AN: 1461866 Hom.: 7 Cov.: 33 AF XY: 0.000644 AC XY: 468 AN XY: 727232

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000504

Gnomad4 SAS exome AF: 0.000696

Gnomad4 FIN exome AF: 0.0148

Gnomad4 NFE exome AF: 0.0000396

Gnomad4 OTH exome AF: 0.000381

GnomAD4 genome AF: 0.00131 AC: 200 AN: 152350 Hom.: 1 Cov.: 33 AF XY: 0.00196 AC XY: 146 AN XY: 74508

Gnomad4 AFR AF: 0.0000240

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000621

Gnomad4 FIN AF: 0.0171

Gnomad4 NFE AF: 0.000132

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.000194 Hom.: 0

Bravo AF: 0.0000378

Asia WGS AF: 0.000577 AC: 2 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Mitochondrial complex V (ATP synthase) deficiency nuclear type 2 Uncertain:1 Benign:1

Dec 15, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 12, 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. -

not provided Benign:1

Sep 16, 2019

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.52
CADD	Benign	8.2
DANN	Benign	0.74

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: rs139864454; hg19: chr8-74893607; COSMIC: COSV56487729; COSMIC: COSV56487729;