2-196217031-C-G

Position:

• chr2-196217031-C-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP2 PP3 PP5_Moderate

The NM_001348768.2(HECW2):​c.4471G>C​(p.Glu1491Gln) 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. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: HECW2 NM_001348768.2 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.57

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), HECW2. . Gene score misZ 3.3052 (greater than the threshold 3.09). Trascript score misZ 3.6429 (greater than threshold 3.09). GenCC has associacion of gene with neurodevelopmental disorder with hypotonia, seizures, and absent language, complex neurodevelopmental disorder.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.839
• PP5: Variant 2-196217031-C-G is Pathogenic according to our data. Variant chr2-196217031-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 666587.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
HECW2	NM_001348768.2	c.4471G>C	p.Glu1491Gln	missense_variant	27/29	ENST00000644978.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
HECW2	ENST00000644978.2	c.4471G>C	p.Glu1491Gln	missense_variant	27/29		NM_001348768.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neurodevelopmental disorder with hypotonia, seizures, and absent language Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

Jul 03, 2018

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.26	T;.;T;T
Eigen	Pathogenic	0.81
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	.;D;.;D
M_CAP	Benign	0.027	D
MetaRNN	Pathogenic	0.84	D;D;D;D
MetaSVM	Benign	-0.56	T
MutationAssessor	Uncertain	2.7	M;.;M;M
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.81	D
PROVEAN	Uncertain	-2.9	D;.;.;.
REVEL	Uncertain	0.39
Sift	Uncertain	0.0010	D;.;.;.
Sift4G	Uncertain	0.0040	D;.;.;.
Polyphen		1.0	D;.;D;D
Vest4		0.68
MutPred		0.75		Gain of MoRF binding (P = 0.0249);.;Gain of MoRF binding (P = 0.0249);Gain of MoRF binding (P = 0.0249);
MVP		0.62
MPC		2.1
ClinPred		0.99	D
GERP RS		5.4
Varity_R		0.60
gMVP		0.84

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

LitVar

Other links and lift over

dbSNP: rs1575235801; hg19: chr2-197081755;