22-29671848-G-C

Variant names:

• chr22-29671848-G-C
• rs754087071
• NM_000268.4:c.1022G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000268.4(NF2):​c.1022G>C​(p.Arg341Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. R341G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NF2 NM_000268.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.99
• Publications: 0 publications found

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]

NF2 Gene-Disease associations (from GenCC):

• NF2-related schwannomatosis

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, ClinGen, Orphanet, Labcorp Genetics (formerly Invitae), G2P
• familial meningioma

  Inheritance: Unknown Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 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
NF2	NM_000268.4	c.1022G>C	p.Arg341Pro	missense_variant	Exon 11 of 16	ENST00000338641.10	NP_000259.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NF2	ENST00000338641.10	c.1022G>C	p.Arg341Pro	missense_variant	Exon 11 of 16	1	NM_000268.4	ENSP00000344666.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

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

Dec 03, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. 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. This variant has not been reported in the literature in individuals with NF2-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces arginine with proline at codon 341 of the NF2 protein (p.Arg341Pro). The arginine residue is highly conserved and there is a moderate physicochemical difference between arginine and proline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.26	D
BayesDel_noAF	Pathogenic	0.14
CADD	Pathogenic	28
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.81	D;.;.;.;.;.;.;.
Eigen	Uncertain	0.21
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.97	D;D;.;.;D;.;D;D
M_CAP	Benign	0.064	D
MetaRNN	Uncertain	0.53	D;D;D;D;D;D;D;D
MetaSVM	Uncertain	-0.11	T
MutationAssessor	Uncertain	2.5	M;.;M;.;.;M;.;M
PhyloP100		10
PrimateAI	Uncertain	0.64	T
PROVEAN	Pathogenic	-5.3	D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.72
Sift	Uncertain	0.0080	D;D;D;D;D;D;D;D
Sift4G	Benign	0.094	T;T;T;T;T;T;T;T
Polyphen		0.10	B;B;B;B;B;B;B;B
Vest4		0.72
MutPred		0.35		Loss of MoRF binding (P = 0.0252);.;Loss of MoRF binding (P = 0.0252);.;.;Loss of MoRF binding (P = 0.0252);.;Loss of MoRF binding (P = 0.0252);
MVP		0.90
MPC		0.95
ClinPred		0.99	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.88
gMVP		0.79
Mutation Taster		=21/79	disease causing

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

Other links and lift over

dbSNP: rs754087071; hg19: chr22-30067837;