rs1555168520

Variant names:

• chr12-8082298-G-A
• rs1555168520
• NM_015509.4:c.10G>A

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_015509.4(NECAP1):​c.10G>A​(p.Glu4Lys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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. E4G) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NECAP1 NM_015509.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.74
• Publications: 0 publications found

Genes affected

NECAP1 (HGNC:24539): (NECAP endocytosis associated 1) This gene encodes a protein containing two characteristic WXXF motifs. The encoded protein localizes to clathrin-coated vesicles, where it binds components of the adapter protein complexes and aids in endocytosis. Loss of function of this gene results in early infantile epileptic encephalopathy-21. There is a pseudogene for this gene on chromosome 7. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jun 2014]

NECAP1 Gene-Disease associations (from GenCC):

• developmental and epileptic encephalopathy, 21

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• genetic developmental and epileptic encephalopathy

  Inheritance: AR Classification: MODERATE Submitted by: ClinGen
• undetermined early-onset epileptic encephalopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000284697 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3751549).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NECAP1	NM_015509.4	c.10G>A	p.Glu4Lys	missense_variant	Exon 1 of 8	ENST00000339754.11	NP_056324.2
NECAP1	NR_024260.2	n.25G>A		non_coding_transcript_exon_variant	Exon 1 of 7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NECAP1	ENST00000339754.11	c.10G>A	p.Glu4Lys	missense_variant	Exon 1 of 8	1	NM_015509.4	ENSP00000341737.5

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

Developmental and epileptic encephalopathy, 21 Uncertain:1

Dec 21, 2017

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 NECAP1-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces glutamic acid with lysine at codon 4 of the NECAP1 protein (p.Glu4Lys). The glutamic acid residue is moderately conserved and there is a small physicochemical difference between glutamic acid and lysine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.48
BayesDel_addAF	Benign	-0.015	T
BayesDel_noAF	Benign	-0.26
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.15	T;T;.;.;.;.
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Benign	0.50	N
LIST_S2	Uncertain	0.97	.;D;D;D;D;D
M_CAP	Benign	0.031	D
MetaRNN	Benign	0.38	T;T;T;T;T;T
MetaSVM	Benign	-0.63	T
MutationAssessor	Uncertain	2.6	M;M;.;.;.;.
PhyloP100		6.7
PrimateAI	Uncertain	0.72	T
PROVEAN	Benign	-1.0	.;N;.;.;.;N
REVEL	Benign	0.19
Sift	Uncertain	0.0040	.;D;.;.;.;D
Sift4G	Uncertain	0.0070	.;D;.;.;.;D
Polyphen		0.99	D;D;.;.;.;.
Vest4		0.59
MutPred		0.33		Gain of ubiquitination at E4 (P = 0.0121);Gain of ubiquitination at E4 (P = 0.0121);Gain of ubiquitination at E4 (P = 0.0121);Gain of ubiquitination at E4 (P = 0.0121);Gain of ubiquitination at E4 (P = 0.0121);Gain of ubiquitination at E4 (P = 0.0121);
MVP		0.50
MPC		0.71
ClinPred		0.96	D
GERP RS		3.9
PromoterAI		-0.092	Neutral
Varity_R		0.60
gMVP		0.57
Mutation Taster		=64/36	polymorphism

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: rs1555168520; hg19: chr12-8234894;