chr14-64017640-C-G

Position:

• chr14-64017640-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_182914.3(SYNE2):​c.4933C>G​(p.Leu1645Val) 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. 13/21 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: SYNE2 NM_182914.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.14

Genes affected

SYNE2 (HGNC:17084): (spectrin repeat containing nuclear envelope protein 2) The protein encoded by this gene is a nuclear outer membrane protein that binds cytoplasmic F-actin. This binding tethers the nucleus to the cytoskeleton and aids in the maintenance of the structural integrity of the nucleus. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17537153).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SYNE2	NM_182914.3	c.4933C>G	p.Leu1645Val	missense_variant	34/116	ENST00000555002.6	NP_878918.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SYNE2	ENST00000555002.6	c.4933C>G	p.Leu1645Val	missense_variant	34/116	1	NM_182914.3	ENSP00000450831	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Emery-Dreifuss muscular dystrophy 5, autosomal dominant Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 07, 2022

This sequence change replaces leucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1645 of the SYNE2 protein (p.Leu1645Val). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SYNE2-related conditions. ClinVar contains an entry for this variant (Variation ID: 538346). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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	Benign	0.083
BayesDel_addAF	Benign	-0.067	T
BayesDel_noAF	Benign	-0.33
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.031	.;T;T;T
Eigen	Benign	-0.15
Eigen_PC	Benign	-0.051
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.86	D;D;D;D
M_CAP	Benign	0.029	D
MetaRNN	Benign	0.18	T;T;T;T
MetaSVM	Benign	-0.98	T
MutationAssessor	Uncertain	2.2	M;.;M;.
MutationTaster	Benign	1.0	D;N;N;N
PrimateAI	Benign	0.40	T
PROVEAN	Benign	-1.7	N;.;N;N
REVEL	Benign	0.016
Sift	Benign	0.16	T;.;T;T
Sift4G	Uncertain	0.021	D;D;D;D
Polyphen		0.30	B;.;B;.
Vest4		0.41
MutPred		0.32		Gain of MoRF binding (P = 0.0972);Gain of MoRF binding (P = 0.0972);Gain of MoRF binding (P = 0.0972);Gain of MoRF binding (P = 0.0972);
MVP		0.42
MPC		0.32
ClinPred		0.66	D
GERP RS		3.0
Varity_R		0.097
gMVP		0.12

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: rs1555431632; hg19: chr14-64484358;