17-76733174-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001080510.5(METTL23):c.281A>T(p.Gln94Leu) variant causes a missense change. The variant allele was found at a frequency of 0.0000263 in 152,230 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: 𝑓 0.000026 (0 hom., cov: 33)
• Consequence: METTL23 NM_001080510.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.26

Genes affected

METTL23 (HGNC:26988): (methyltransferase 23, arginine) The protein encoded by this gene functions as a transcription factor regulator in the transcriptional pathway for human cognition. It is a partner of the alpha subunit of the GA-binding protein transcription factor. Mutations in this gene cause mild autosomal recessive intellectual disability. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17182979).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
METTL23	NM_001080510.5	c.281A>T	p.Gln94Leu	missense_variant	3/5	ENST00000341249.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
METTL23	ENST00000341249.11	c.281A>T	p.Gln94Leu	missense_variant	3/5	1	NM_001080510.5	P1

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152230 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000965

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 33

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152230 Hom.: 0 Cov.: 33 AF XY: 0.0000403 AC XY: 3 AN XY: 74378

Gnomad4 AFR AF: 0.0000965

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 27, 2023

The c.281A>T (p.Q94L) alteration is located in exon 3 (coding exon 2) of the METTL23 gene. This alteration results from a A to T substitution at nucleotide position 281, causing the glutamine (Q) at amino acid position 94 to be replaced by a leucine (L). 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	0.092
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.54
Cadd	Benign	17
Dann	Benign	0.89
Eigen	Benign	-0.44
Eigen_PC	Benign	-0.12
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.79	T;T;T;T;.;T;T;.;T;.;.;T;T;T
M_CAP	Benign	0.0068	T
MetaRNN	Benign	0.17	T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.98	T
MutationTaster	Benign	0.83	D;D;D;D;D;D;D;D;D;D
PrimateAI	Benign	0.30	T
Sift4G	Benign	0.89	T;T;T;T;T;T;T;T;T;T;T;T;T;T
Polyphen		0.0010	.;B;.;.;.;.;.;.;.;.;B;.;.;.
Vest4		0.28
MutPred		0.60		Loss of sheet (P = 0.0025);Loss of sheet (P = 0.0025);.;Loss of sheet (P = 0.0025);Loss of sheet (P = 0.0025);Loss of sheet (P = 0.0025);Loss of sheet (P = 0.0025);.;.;.;Loss of sheet (P = 0.0025);.;.;.;
MVP		0.31
MPC		.;.;.;.;.;.;.;.;.;.;7.59993916765E-4;.;.;.
ClinPred		0.80	D
GERP RS		5.1
Varity_R		0.12
gMVP		0.64

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs768558354; hg19: chr17-74729256;