19-39499205-G-C

Position:

• chr19-39499205-G-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_203486.3(DLL3):​c.83G>C​(p.Gly28Ala) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: DLL3 NM_203486.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.49

Genes affected

DLL3 (HGNC:2909): (delta like canonical Notch ligand 3) This gene encodes a member of the delta protein ligand family. This family functions as Notch ligands that are characterized by a DSL domain, EGF repeats, and a transmembrane domain. Mutations in this gene cause autosomal recessive spondylocostal dysostosis 1. Two transcript variants encoding distinct isoforms have been identified for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.981

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DLL3	NM_203486.3	c.83G>C	p.Gly28Ala	missense_variant	2/9	ENST00000356433.10	NP_982353.1
DLL3	NM_016941.4	c.83G>C	p.Gly28Ala	missense_variant	2/8		NP_058637.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DLL3	ENST00000356433.10	c.83G>C	p.Gly28Ala	missense_variant	2/9	2	NM_203486.3	ENSP00000348810	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1417450 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 702956

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000756

ExAC AF: 0.00000847 AC: 1

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

Aug 24, 2021

This sequence change replaces glycine with alanine at codon 28 of the DLL3 protein (p.Gly28Ala). The glycine residue is highly conserved and there is a small physicochemical difference between glycine and alanine. This variant is present in population databases (rs747594090, ExAC 0.07%). This variant has not been reported in the literature in individuals affected with DLL3-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.18
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.78	.;.;D
Eigen	Uncertain	0.57
Eigen_PC	Uncertain	0.49
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.81	T;T;T
M_CAP	Pathogenic	0.72	D
MetaRNN	Pathogenic	0.98	D;D;D
MetaSVM	Pathogenic	0.97	D
MutationAssessor	Uncertain	2.8	M;.;M
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.73	T
PROVEAN	Pathogenic	-5.2	D;.;D
REVEL	Pathogenic	0.85
Sift	Pathogenic	0.0	D;.;D
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		0.99	.;.;D
Vest4		0.50
MutPred		0.97		Loss of catalytic residue at V29 (P = 0.1253);Loss of catalytic residue at V29 (P = 0.1253);Loss of catalytic residue at V29 (P = 0.1253);
MVP		0.99
MPC		1.6
ClinPred		0.99	D
GERP RS		4.2
Varity_R		0.80

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs747594090; hg19: chr19-39989845;