Genetic Variant NM_022840.5:c.1198G>A (chr18-2544270-C-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_022840.5(METTL4):c.1198G>A(p.Val400Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000174 in 1,611,840 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

METTL4
NM_022840.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.264

Variant links:

Genes affected

METTL4 (HGNC:24726): (methyltransferase 4, N6-adenosine) Enables RNA methyltransferase activity and site-specific DNA-methyltransferase (adenine-specific) activity. Involved in nucleic acid metabolic process; regulation of RNA metabolic process; and regulation of mitochondrial DNA replication. Located in cytosol; mitochondrial matrix; and nucleus. [provided by Alliance of Genome Resources, Apr 2022]

METTL4 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

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=0.06926754).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
METTL4	NM_022840.5 link	c.1198G>A	p.Val400Met	missense_variant	Exon 8 of 9	ENST00000574538.2	NP_073751.3	Q8N3J2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
METTL4	ENST00000574538.2 link	c.1198G>A	p.Val400Met	missense_variant	Exon 8 of 9	1	NM_022840.5	ENSP00000458290.1	Q8N3J2
METTL4	ENST00000573134.1 link	n.3499G>A		non_coding_transcript_exon_variant	Exon 6 of 7	1
METTL4	ENST00000319888.10 link	c.1181+383G>A		intron_variant	Intron 7 of 7	5		ENSP00000320349.6	J3KNJ7
METTL4	ENST00000576251.5 link	c.267+3085G>A		intron_variant	Intron 3 of 3	2		ENSP00000460774.1	I3L3W2

Frequencies

GnomAD3 genomes

AF:

0.0000461

AC:

AN:

151976

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000967

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000200

AC:

AN:

250304

AF XY:

0.0000296

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.0000293

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000144

AC:

AN:

1459864

Hom.:

Cov.:

AF XY:

0.0000193

AC XY:

AN XY:

726310

show subpopulations

African (AFR)

AF:

0.000150

AC:

AN:

33412

American (AMR)

AF:

0.00

AC:

AN:

44316

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26100

East Asian (EAS)

AF:

0.00

AC:

AN:

39648

South Asian (SAS)

AF:

0.00

AC:

AN:

86000

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53390

Middle Eastern (MID)

AF:

0.000174

AC:

AN:

5760

European-Non Finnish (NFE)

AF:

0.0000135

AC:

AN:

1110942

Other (OTH)

AF:

0.00

AC:

AN:

60296

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.465

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000461

AC:

AN:

151976

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74204

show subpopulations

African (AFR)

AF:

0.0000967

AC:

AN:

41370

American (AMR)

AF:

0.0000656

AC:

AN:

15236

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5192

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10568

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68006

Other (OTH)

AF:

0.00

AC:

AN:

2088

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.496

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000680

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 30, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1198G>A (p.V400M) alteration is located in exon 8 (coding exon 7) of the METTL4 gene. This alteration results from a G to A substitution at nucleotide position 1198, causing the valine (V) at amino acid position 400 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

Benign

0.086

BayesDel_addAF

Benign

-0.45

BayesDel_noAF

Benign

-0.64

CADD

Benign

9.8

(source)

DANN

Benign

0.78

DEOGEN2

Benign

0.0052

Eigen

Benign

-0.71

Eigen_PC

Benign

-0.71

FATHMM_MKL

Benign

0.14

LIST_S2

Benign

0.67

M_CAP

Benign

0.0093

MetaRNN

Benign

0.069

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.9

PhyloP100

-0.26

PrimateAI

Benign

0.32

Sift4G

Benign

0.28

Polyphen

0.18

Vest4

0.12

MVP

0.25

MPC

0.11

ClinPred

0.034

GERP RS

3.0

Varity_R

0.041

gMVP

0.27

Mutation Taster

=96/4

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.13

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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NM_022840.5:c.1198G>A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over