15-29268868-C-A

Position:

• chr15-29268868-C-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_138704.4(NSMCE3):​c.838G>T​(p.Ala280Ser) 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. 13/20 in silico tools predict 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. A280V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NSMCE3 NM_138704.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0240

Genes affected

NSMCE3 (HGNC:7677): (NSE3 homolog, SMC5-SMC6 complex component) The protein encoded by this gene is part of the SMC5-6 chromatin reorganizing complex and is a member of the MAGE superfamily. This is an intronless gene. [provided by RefSeq, May 2011]

ENTREP2 (HGNC:29075): (endosomal transmembrane epsin interactor 2) Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.028853595).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NSMCE3	NM_138704.4	c.838G>T	p.Ala280Ser	missense_variant	1/1	ENST00000332303.6
ENTREP2	NM_015307.2	c.277-16390G>T		intron_variant		ENST00000261275.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NSMCE3	ENST00000332303.6	c.838G>T	p.Ala280Ser	missense_variant	1/1		NM_138704.4	P1
ENTREP2	ENST00000261275.5	c.277-16390G>T		intron_variant		5	NM_015307.2	P1
ENTREP2	ENST00000560082.1	c.-12-16390G>T		intron_variant		4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 07, 2022

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. This variant has not been reported in the literature in individuals affected with NSMCE3-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 280 of the NSMCE3 protein (p.Ala280Ser). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.094
BayesDel_addAF	Benign	-0.32	T
BayesDel_noAF	Benign	-0.70
CADD	Benign	13
DANN	Benign	0.93
DEOGEN2	Benign	0.0012	T
Eigen	Benign	-1.1
Eigen_PC	Benign	-0.99
FATHMM_MKL	Benign	0.048	N
LIST_S2	Benign	0.23	T
M_CAP	Benign	0.0026	T
MetaRNN	Benign	0.029	T
MetaSVM	Benign	-0.91	T
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	0.53	N
REVEL	Benign	0.019
Sift	Benign	0.56	T
Sift4G	Benign	0.91	T
Polyphen		0.0070	B
Vest4		0.13
MutPred		0.30		Gain of ubiquitination at K276 (P = 0.0662);
MVP		0.13
MPC		0.41
ClinPred		0.090	T
GERP RS		1.9
Varity_R		0.057
gMVP		0.26

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr15-29561072;