rs201527155

chr22-29678289-A-Cchr22-29678289-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM1 PM2 BP4

The NM_000268.4(NF2):c.1540A>C(p.Met514Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,800 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M514V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: NF2 NM_000268.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.32

Genes affected

NF2 (HGNC:7773): (NF2, moesin-ezrin-radixin like (MERLIN) tumor suppressor) This gene encodes a protein that is similar to some members of the ERM (ezrin, radixin, moesin) family of proteins that link cytoskeletal components with proteins in the cell membrane. The encoded protein is involved in regulation of contact-dependent inhibition of cell proliferation and functions in cell-cell adhesion and transmembrane signaling. The encoded protein has been shown to interact with cell-surface proteins, proteins involved in cytoskeletal dynamics, and proteins involved in regulating ion transport. Disruption of this protein's function has been implicated in tumorigenesis and metastasis. Mutations in this gene are associated with neurofibromatosis type II which is characterized by nervous system and skin tumors and ocular abnormalities. [provided by RefSeq, May 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a helix (size 34) in uniprot entity MERL_HUMAN there are 5 pathogenic changes around while only 2 benign (71%) in NM_000268.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.35675627).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NF2	NM_000268.4	c.1540A>C	p.Met514Leu	missense_variant	14/16	ENST00000338641.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NF2	ENST00000338641.10	c.1540A>C	p.Met514Leu	missense_variant	14/16	1	NM_000268.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461800 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727196

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neurofibromatosis, type 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Aug 14, 2020

This sequence change replaces methionine with leucine at codon 514 of the NF2 protein (p.Met514Leu). The methionine residue is highly conserved and there is a small physicochemical difference between methionine and leucine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with NF2-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.48
BayesDel_addAF	Uncertain	0.096	D
BayesDel_noAF	Benign	-0.10
Cadd	Benign	22
Dann	Benign	0.96
DEOGEN2	Uncertain	0.43	T;.;.;.;.;.;.;.;.
Eigen	Benign	-0.062
Eigen_PC	Benign	0.17
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.86	D;D;D;.;.;D;.;D;D
M_CAP	Benign	0.037	D
MetaRNN	Benign	0.36	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.68	T
MutationAssessor	Benign	0.85	L;.;.;L;.;.;L;.;L
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-0.98	N;N;N;N;N;N;N;N;N
REVEL	Uncertain	0.32
Sift	Benign	0.13	T;T;T;T;T;T;T;T;T
Sift4G	Benign	0.70	T;T;T;T;T;T;T;T;T
Polyphen		0.0020	B;B;B;B;B;B;B;B;B
Vest4		0.41
MutPred		0.80		Gain of methylation at K515 (P = 0.0405);.;.;Gain of methylation at K515 (P = 0.0405);.;.;Gain of methylation at K515 (P = 0.0405);.;Gain of methylation at K515 (P = 0.0405);
MVP		0.83
MPC		0.61
ClinPred		0.88	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		2.7
Varity_R		0.38
gMVP		0.42

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: rs201527155; hg19: chr22-30074278;