Genetic Variant METTL27:p.Arg114Cys (chr7-73840462-G-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_152559.3(METTL27):c.340C>T(p.Arg114Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000287 in 1,604,840 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000030 ( 0 hom. )

Consequence

METTL27
NM_152559.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.663

Variant links:

Genes affected

METTL27 (HGNC:19068): (methyltransferase like 27) This gene encodes a protein belonging to ubiE/COQ5 methyltransferase family. The gene is deleted in Williams syndrome, a multisystem developmental disorder caused by the deletion of contiguous genes at 7q11.22-q11.23. [provided by RefSeq, Jul 2008]

METTL27 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
METTL27	NM_152559.3 link	c.340C>T	p.Arg114Cys	missense_variant	Exon 4 of 6	ENST00000297873.9	NP_689772.2	Q8N6F8
METTL27	XM_017011777.2 link	c.340C>T	p.Arg114Cys	missense_variant	Exon 4 of 6		XP_016867266.1
METTL27	XM_017011778.2 link	c.340C>T	p.Arg114Cys	missense_variant	Exon 4 of 6		XP_016867267.1
METTL27	XR_001744563.2 link	n.371C>T		non_coding_transcript_exon_variant	Exon 4 of 7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
METTL27	ENST00000297873.9 link	c.340C>T	p.Arg114Cys	missense_variant	Exon 4 of 6	1	NM_152559.3	ENSP00000297873.4	Q8N6F8
METTL27	ENST00000458679.5 link	n.253-342C>T		intron_variant	Intron 3 of 4	4		ENSP00000398533.1	B4DWM3
METTL27	ENST00000493174.1 link	n.284-342C>T		intron_variant	Intron 3 of 3	2

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152014

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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

GnomAD3 exomes

AF:

0.000114

AC:

AN:

228378

Hom.:

AF XY:

0.000104

AC XY:

AN XY:

125234

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000698

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000687

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000179

GnomAD4 exome

AF:

0.0000296

AC:

AN:

1452826

Hom.:

Cov.:

AF XY:

0.0000332

AC XY:

AN XY:

722208

show subpopulations

Gnomad4 AFR exome

AF:

0.0000903

Gnomad4 AMR exome

AF:

0.000481

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000823

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000992

Gnomad4 OTH exome

AF:

0.0000167

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152014

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74240

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.0000655

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

Alfa

AF:

0.0000648

Hom.:

Bravo

AF:

0.0000907

ExAC

AF:

0.0000827

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Nov 15, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.340C>T (p.R114C) alteration is located in exon 4 (coding exon 3) of the WBSCR27 gene. This alteration results from a C to T substitution at nucleotide position 340, causing the arginine (R) at amino acid position 114 to be replaced by a cysteine (C). 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

0.080

BayesDel_addAF

Benign

-0.54

BayesDel_noAF

Benign

-0.64

CADD

Benign

7.2

DANN

Benign

0.93

DEOGEN2

Benign

0.034

Eigen

Benign

-1.0

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.043

LIST_S2

Benign

0.32

M_CAP

Benign

0.0084

MetaRNN

Benign

0.022

MetaSVM

Benign

-0.97

PrimateAI

Benign

0.24

PROVEAN

Uncertain

-3.1

REVEL

Benign

0.030

Sift

Benign

0.10

Sift4G

Benign

0.082

Polyphen

0.0030

Vest4

0.18

MVP

0.13

MPC

0.17

ClinPred

0.039

GERP RS

-4.3

Varity_R

0.11

gMVP

0.44

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.22

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.22

Position offset: -48

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