NM_001348768.2:c.4334A>G

Variant names:

• chr2-196220113-T-C
• rs878854424
• NM_001348768.2:c.4334A>G
• HECW2 p.Glu1445Gly

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM1 PM2 PM5 PP3_Strong

The NM_001348768.2(HECW2):​c.4334A>G​(p.Glu1445Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 13/22 in silico tools predict a damaging 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. E1445Q) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: HECW2 NM_001348768.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1 O:1
• Conservation: PhyloP100: 7.67
• Publications: 4 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: AD, AR Classification: DEFINITIVE, LIMITED Submitted by: ClinGen
• neurodevelopmental disorder with hypotonia, seizures, and absent language

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

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PM1: In a hotspot region, there are 7 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_001348768.2
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-196220114-C-G is described in ClinVar as Pathogenic. ClinVar VariationId is 1027614.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.964

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.4334A>G	p.Glu1445Gly	missense	Exon 26 of 29	NP_001335697.1	Q9P2P5-1
	HECW2	NM_020760.4		c.4334A>G	p.Glu1445Gly	missense	Exon 26 of 29	NP_065811.1	Q9P2P5-1
	HECW2	NM_001304840.3		c.3266A>G	p.Glu1089Gly	missense	Exon 24 of 27	NP_001291769.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HECW2	ENST00000644978.2	MANE Select	c.4334A>G	p.Glu1445Gly	missense	Exon 26 of 29	ENSP00000495418.1	Q9P2P5-1
	HECW2	ENST00000260983.8	TSL:1	c.4334A>G	p.Glu1445Gly	missense	Exon 26 of 29	ENSP00000260983.2	Q9P2P5-1
	HECW2	ENST00000644030.1		c.4355A>G	p.Glu1452Gly	missense	Exon 26 of 29	ENSP00000495504.1	A0A2R8Y6F3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	1	-	Neurodevelopmental disorder with hypotonia, seizures, and absent language (2)
-	-	-	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.34
CADD	Pathogenic	28
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.38	T
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Uncertain	0.26	D
MetaRNN	Pathogenic	0.96	D
MetaSVM	Uncertain	0.51	D
MutationAssessor	Pathogenic	4.3	H
PhyloP100		7.7
PrimateAI	Pathogenic	0.87	D
PROVEAN	Pathogenic	-6.6	D
REVEL	Pathogenic	0.88
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0010	D
Varity_R		0.94
gMVP		0.96
Mutation Taster		=9/91	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs878854424;

hg19: chr2-197084837;