Genetic Variant SYNE2:p.Asp19Tyr (chr14-63909203-G-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_182914.3(SYNE2):c.55G>T(p.Asp19Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,178 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D19N) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

SYNE2
NM_182914.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.46

Publications

0 publications found

Variant links:

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]

SYNE2 Gene-Disease associations (from GenCC):

autosomal dominant Emery-Dreifuss muscular dystrophy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Emery-Dreifuss muscular dystrophy 5, autosomal dominant
Inheritance: AD, Unknown Classification: LIMITED, NO_KNOWN Submitted by: Illumina, Labcorp Genetics (formerly Invitae), Ambry Genetics
left ventricular noncompaction
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

SYNE2 links:

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ACMG classification

Classification was made for transcript

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
SYNE2	NM_182914.3 link	c.55G>T	p.Asp19Tyr	missense_variant	Exon 2 of 116	ENST00000555002.6	NP_878918.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SYNE2	ENST00000555002.6 link	c.55G>T	p.Asp19Tyr	missense_variant	Exon 2 of 116	1	NM_182914.3	ENSP00000450831.2		Q8WXH0-2A0A0C4DGK3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461178

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726952

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33466

American (AMR)

AF:

0.00

AC:

AN:

44714

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26128

East Asian (EAS)

AF:

0.00

AC:

AN:

39688

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86240

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53392

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111422

Other (OTH)

AF:

0.00

AC:

AN:

60362

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.29

BayesDel_addAF

Pathogenic

0.18

BayesDel_noAF

Uncertain

0.020

CADD

Benign

(source)

DANN

Benign

0.92

DEOGEN2

Benign

0.065

.;T;T;.;T

Eigen

Uncertain

0.32

Eigen_PC

Uncertain

0.26

FATHMM_MKL

Uncertain

0.78

LIST_S2

Uncertain

0.91

D;D;D;D;D

M_CAP

Pathogenic

0.34

MetaRNN

Uncertain

0.49

T;T;T;T;T

MetaSVM

Uncertain

0.64

MutationAssessor

Benign

1.8

L;.;L;L;.

PhyloP100

2.5

PrimateAI

Uncertain

0.50

PROVEAN

Uncertain

-2.8

D;.;D;D;D

REVEL

Uncertain

0.39

Sift

Uncertain

0.011

D;.;D;D;D

Sift4G

Uncertain

0.0020

D;D;D;D;D

Polyphen

1.0

D;.;D;D;.

Vest4

0.69

MutPred

0.45

Loss of disorder (P = 0.0043);Loss of disorder (P = 0.0043);Loss of disorder (P = 0.0043);Loss of disorder (P = 0.0043);Loss of disorder (P = 0.0043);

MVP

0.81

MPC

0.32

ClinPred

0.90

GERP RS

4.5

PromoterAI

-0.081

Neutral

(source)

Varity_R

0.27

gMVP

0.48

Mutation Taster

=89/11

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over