2-196215922-C-T

Variant names:

• chr2-196215922-C-T
• rs1353654549
• NM_001348768.2:c.4550G>A

Variant summary

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

The NM_001348768.2(HECW2):​c.4550G>A​(p.Ser1517Asn) 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 (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: HECW2 NM_001348768.2 missense
• Clinical Significance: Uncertain significance no assertion criteria provided U:1
• Conservation: PhyloP100: 7.57
• Publications: 0 publications found

Genes affected

HECW2 (HGNC:29853): (HECT, C2 and WW domain containing E3 ubiquitin protein ligase 2) This gene encodes a member of a family of E3 ubiquitin ligases which plays an important role in the proliferation, migration and differentiation of neural crest cells as a regulator of glial cell line-derived neurotrophic factor (GDNF)/Ret signaling. This gene also plays an important role in angiogenesis through stabilization of endothelial cell-to-cell junctions as a regulator of angiomotin-like 1 stability. The encoded protein contains an N-terminal calcium/lipid-binding (C2) domain involved in membrane targeting, two-four WW domains responsible for cellular localization and substrate recognition, and a C-terminal homologous with E6-associated protein C-terminus (HECT) catalytic domain. Naturally occurring mutations in this gene are associated with neurodevelopmental delay, hypotonia, and epilepsy. The decreased expression of this gene in the aganglionic colon is associated with Hirschsprung's disease. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2017]

HECW2 Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AR, AD Classification: DEFINITIVE, LIMITED Submitted by: ClinGen
• neurodevelopmental disorder with hypotonia, seizures, and absent language

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Illumina

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001348768.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HECW2	NM_001348768.2	MANE Select	c.4550G>A	p.Ser1517Asn	missense	Exon 28 of 29	NP_001335697.1	Q9P2P5-1
	HECW2	NM_020760.4		c.4550G>A	p.Ser1517Asn	missense	Exon 28 of 29	NP_065811.1	Q9P2P5-1
	HECW2	NM_001304840.3		c.3482G>A	p.Ser1161Asn	missense	Exon 26 of 27	NP_001291769.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HECW2	ENST00000644978.2	MANE Select	c.4550G>A	p.Ser1517Asn	missense	Exon 28 of 29	ENSP00000495418.1	Q9P2P5-1
	HECW2	ENST00000260983.8	TSL:1	c.4550G>A	p.Ser1517Asn	missense	Exon 28 of 29	ENSP00000260983.2	Q9P2P5-1
	HECW2	ENST00000644030.1		c.4571G>A	p.Ser1524Asn	missense	Exon 28 of 29	ENSP00000495504.1	A0A2R8Y6F3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
-	1	-	Neurodevelopmental disorder with hypotonia, seizures, and absent language (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Benign	-0.047	T
BayesDel_noAF	Benign	-0.30
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.26	T
Eigen	Uncertain	0.66
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.027	D
MetaRNN	Uncertain	0.60	D
MetaSVM	Benign	-0.82	T
MutationAssessor	Uncertain	2.3	M
PhyloP100		7.6
PrimateAI	Pathogenic	0.86	D
PROVEAN	Uncertain	-2.9	D
REVEL	Benign	0.26
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.037	D
Polyphen		0.87	P
Vest4		0.64
MutPred		0.51		Loss of phosphorylation at S1517 (P = 0.0564)
MVP		0.65
MPC		2.0
ClinPred		0.99	D
GERP RS		5.3
Varity_R		0.78
gMVP		0.67
Mutation Taster		=75/25	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: rs1353654549; hg19: chr2-197080646;