17-76733165-TACC-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PM4_SupportingPP5

The NM_001080510.5(METTL23):c.278_280delCAC(p.Pro93del) variant causes a disruptive inframe deletion change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000154 in 1,613,966 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00016 ( 0 hom. )

Consequence

METTL23
NM_001080510.5 disruptive_inframe_deletion

Scores

Not classified

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:3

Conservation

PhyloP100: 7.55

Variant links:

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]

METTL23 links:

ENSG00000267168 (HGNC:):

ENSG00000267168 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM4

Nonframeshift variant in NON repetitive region in NM_001080510.5. Strenght limited to Supporting due to length of the change: 1aa.

PP5

Variant 17-76733165-TACC-T is Pathogenic according to our data. Variant chr17-76733165-TACC-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 520855.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
METTL23	NM_001080510.5 link	c.278_280delCAC	p.Pro93del	disruptive_inframe_deletion	Exon 3 of 5	ENST00000341249.11	NP_001073979.3	Q86XA0-1A0A024R8M5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
METTL23	ENST00000341249.11 link	c.278_280delCAC	p.Pro93del	disruptive_inframe_deletion	Exon 3 of 5	1	NM_001080510.5	ENSP00000341543.5		Q86XA0-1
ENSG00000267168	ENST00000587459.1 link	c.194_196delCAC	p.Pro65del	disruptive_inframe_deletion	Exon 1 of 2	5		ENSP00000466829.1		K7EN84

Frequencies

GnomAD3 genomes

AF:

0.000131

AC:

AN:

152244

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

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:

0.000191

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000100

AC:

AN:

248960

Hom.:

AF XY:

0.0000962

AC XY:

AN XY:

135076

show subpopulations

Gnomad AFR exome

AF:

0.000259

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000982

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000151

Gnomad OTH exome

AF:

0.000165

GnomAD4 exome

AF:

0.000156

AC:

228

AN:

1461604

Hom.:

AF XY:

0.000166

AC XY:

121

AN XY:

727062

show subpopulations

Gnomad4 AFR exome

AF:

0.0000896

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.0000580

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000192

Gnomad4 OTH exome

AF:

0.0000828

GnomAD4 genome

AF:

0.000131

AC:

AN:

152362

Hom.:

Cov.:

AF XY:

0.000148

AC XY:

AN XY:

74510

show subpopulations

Gnomad4 AFR

AF:

0.000144

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:

0.000191

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.0000959

Hom.:

Bravo

AF:

0.000106

EpiCase

AF:

0.000273

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:1Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Feb 01, 2022	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Dec 11, 2024	In-frame deletion of 1 amino acid(s) in a non-repeat region; In silico analysis supports a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 10, 2023

The c.278_280delCAC (p.P93del) alteration, located in exon 3 (coding exon 2) of the METTL23 gene, results from an in-frame deletion at nucleotide positions c.278 to c.280. This results in the deletion of a proline residue at codon 93. Based on data from gnomAD, this allele has an overall frequency of 0.010% (28/280370) total alleles studied. The highest observed frequency was 0.025% (6/24172) of African alleles. This amino acid position is not well conserved in available vertebrate species. The p.P93 amino acid is located in the lysine methyltransferase domain of the METTL23 protein. Methyltransferases catalyze the transfer of a methyl group from S-adenosyl L-methionine (SAM) to a nucleophilic acceptor (Kozbial, 2005). All methyltransferases share a conserved region of approximately 130 amino acids, which allows them to bind to SAM (Schluckebier, 1995). This alteration is predicted to be deleterious by in silico analysis (Choi, 2012). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Intellectual disability, autosomal recessive 44

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Zotz-Klimas Genetics Lab, MVZ Zotz Klimas

Apr 13, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over