2-171360502-T-C

Position:

• chr2-171360502-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001321154.2(METTL8):​c.155A>G​(p.Gln52Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000548 in 1,461,116 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000055 (1 hom.)
• Consequence: METTL8 NM_001321154.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.79

Genes affected

METTL8 (HGNC:25856): (methyltransferase 8, tRNA N3-cytidine) Enables mRNA methyltransferase activity. Involved in mRNA methylation. Predicted to be located in cytoplasm and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.31059045).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
METTL8	NM_001321154.2	c.155A>G	p.Gln52Arg	missense_variant	3/10	ENST00000375258.9	NP_001308083.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
METTL8	ENST00000375258.9	c.155A>G	p.Gln52Arg	missense_variant	3/10	5	NM_001321154.2	ENSP00000364407	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000548 AC: 8 AN: 1461116 Hom.: 1 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 726864

Gnomad4 AFR exome AF: 0.000179

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

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

May 16, 2024

The c.155A>G (p.Q52R) alteration is located in exon 3 (coding exon 2) of the METTL8 gene. This alteration results from a A to G substitution at nucleotide position 155, causing the glutamine (Q) at amino acid position 52 to be replaced by an arginine (R). 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	Benign	0.11
BayesDel_addAF	Benign	-0.062	T
BayesDel_noAF	Benign	-0.33
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.065	.;T;.;T;T;T;T;T
Eigen	Uncertain	0.22
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.53	T;T;T;T;T;T;T;T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.31	T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.4	.;.;.;M;.;.;.;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.55	T
PROVEAN	Benign	-2.1	.;N;.;.;N;D;D;D
REVEL	Benign	0.098
Sift	Benign	0.038	.;D;.;.;D;D;D;D
Sift4G	Benign	0.10	T;T;.;.;.;T;D;D
Polyphen		0.63	P;.;.;D;.;.;.;.
Vest4		0.26
MutPred		0.32		Gain of MoRF binding (P = 0.0103);Gain of MoRF binding (P = 0.0103);.;Gain of MoRF binding (P = 0.0103);Gain of MoRF binding (P = 0.0103);Gain of MoRF binding (P = 0.0103);Gain of MoRF binding (P = 0.0103);Gain of MoRF binding (P = 0.0103);
MVP		0.17
MPC		0.10
ClinPred		0.93	D
GERP RS		5.3
Varity_R		0.13
gMVP		0.44

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: rs765214248; hg19: chr2-172217012;