1-19700841-C-T

Position:

• chr1-19700841-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_181719.7(TMCO4):​c.1309G>A​(p.Val437Met) variant causes a missense change. The variant allele was found at a frequency of 0.00000342 in 1,461,876 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 Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: TMCO4 NM_181719.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.25

Genes affected

TMCO4 (HGNC:27393): (transmembrane and coiled-coil domains 4) Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.901

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TMCO4	NM_181719.7	c.1309G>A	p.Val437Met	missense_variant	14/16	ENST00000294543.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TMCO4	ENST00000294543.11	c.1309G>A	p.Val437Met	missense_variant	14/16	1	NM_181719.7	P1
TMCO4	ENST00000375127.5	c.1309G>A	p.Val437Met	missense_variant	13/16	1
TMCO4	ENST00000489814.5	n.328G>A		non_coding_transcript_exon_variant	3/5	2
TMCO4	ENST00000494342.1	n.370G>A		non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461876 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727238

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000450

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 18, 2022

The c.1309G>A (p.V437M) alteration is located in exon 14 (coding exon 11) of the TMCO4 gene. This alteration results from a G to A substitution at nucleotide position 1309, causing the valine (V) at amino acid position 437 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.41
BayesDel_addAF	Uncertain	0.086	D
BayesDel_noAF	Benign	-0.11
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.038	T;.
Eigen	Pathogenic	0.70
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.96	D;D
M_CAP	Benign	0.023	T
MetaRNN	Pathogenic	0.90	D;D
MetaSVM	Benign	-0.37	T
MutationAssessor	Uncertain	2.2	M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.54	T
PROVEAN	Uncertain	-2.5	N;N
REVEL	Benign	0.28
Sift	Uncertain	0.0020	D;D
Sift4G	Uncertain	0.0030	D;D
Polyphen		0.98	D;.
Vest4		0.85
MutPred		0.68		Gain of disorder (P = 0.0715);Gain of disorder (P = 0.0715);
MVP		0.31
MPC		0.52
ClinPred		0.98	D
GERP RS		5.4
Varity_R		0.50
gMVP		0.71

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: rs1468651537; hg19: chr1-20027334;