chr16-8628900-G-A

Position:

• chr16-8628900-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_024109.4(METTL22):​c.304G>A​(p.Ala102Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: METTL22 NM_024109.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.241

Genes affected

METTL22 (HGNC:28368): (methyltransferase 22, Kin17 lysine) This gene encodes a member of the non-histone lysine methyltransferases. It interacts with its substrate, Kin17, which is involved in DNA repair and replication and mRNA processing. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.037313372).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
METTL22	NM_024109.4	c.304G>A	p.Ala102Thr	missense_variant	3/11	ENST00000381920.8	NP_077014.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
METTL22	ENST00000381920.8	c.304G>A	p.Ala102Thr	missense_variant	3/11	5	NM_024109.4	ENSP00000371345	P2
METTL22	ENST00000163678.11	c.304G>A	p.Ala102Thr	missense_variant, NMD_transcript_variant	3/10	1		ENSP00000163678
METTL22	ENST00000561758.5	c.280+24G>A		intron_variant		5		ENSP00000457152	A2
METTL22	ENST00000567295.5	c.134G>A	p.Gly45Asp	missense_variant, splice_region_variant, NMD_transcript_variant	3/5	3		ENSP00000457913

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

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

Apr 11, 2023

The c.304G>A (p.A102T) alteration is located in exon 3 (coding exon 2) of the METTL22 gene. This alteration results from a G to A substitution at nucleotide position 304, causing the alanine (A) at amino acid position 102 to be replaced by a threonine (T). 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	0.071
BayesDel_addAF	Benign	-0.36	T
BayesDel_noAF	Benign	-0.76
CADD	Benign	9.6
DANN	Benign	0.47
DEOGEN2	Benign	0.0016	T
Eigen	Benign	-0.93
Eigen_PC	Benign	-0.95
FATHMM_MKL	Benign	0.13	N
LIST_S2	Benign	0.65	T
M_CAP	Benign	0.0074	T
MetaRNN	Benign	0.037	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.1	L
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.27	N
REVEL	Benign	0.018
Sift	Benign	0.53	T
Sift4G	Benign	0.58	T
Polyphen		0.0	B
Vest4		0.047
MutPred		0.11		Loss of helix (P = 0.0068);
MVP		0.099
MPC		0.016
ClinPred		0.041	T
GERP RS		1.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.030
gMVP		0.11

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: rs1596336356; hg19: chr16-8722757;