X-70445283-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_021120.4(DLG3):c.82C>A(p.Pro28Thr) 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 (★★).

• Frequency: Genomes: not found (cov: 24)
• Consequence: DLG3 NM_021120.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 6.86

Genes affected

DLG3 (HGNC:2902): (discs large MAGUK scaffold protein 3) This gene encodes a member of the membrane-associated guanylate kinase protein family. The encoded protein may play a role in clustering of NMDA receptors at excitatory synapses. It may also negatively regulate cell proliferation through interaction with the C-terminal region of the adenomatosis polyposis coli tumor suppressor protein. Mutations in this gene have been associated with X-linked cognitive disability. Alternatively spliced transcript variants have been described. [provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.36841354).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DLG3	NM_021120.4	c.82C>A	p.Pro28Thr	missense_variant	1/19	ENST00000374360.8
DLG3	XM_006724625.3	c.82C>A	p.Pro28Thr	missense_variant	1/20
DLG3	XM_011530883.2	c.82C>A	p.Pro28Thr	missense_variant	1/19
DLG3	XM_006724626.3	c.82C>A	p.Pro28Thr	missense_variant	1/20

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DLG3	ENST00000374360.8	c.82C>A	p.Pro28Thr	missense_variant	1/19	1	NM_021120.4
DLG3	ENST00000194900.8	c.82C>A	p.Pro28Thr	missense_variant	1/21	5		P1
DLG3	ENST00000463252.5	n.148C>A		non_coding_transcript_exon_variant	1/19	5

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 24

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Nov 17, 2023

Variant summary: DLG3 c.82C>A (p.Pro28Thr) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 101365 control chromosomes (gnomAD). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. To our knowledge, no occurrence of c.82C>A in individuals affected with Intellectual Disability, X-Linked 90 and no experimental evidence demonstrating its impact on protein function have been reported. No submitters have reported clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as uncertain significance. -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 19, 2023

The c.82C>A (p.P28T) alteration is located in exon 1 (coding exon 1) of the DLG3 gene. This alteration results from a C to A substitution at nucleotide position 82, causing the proline (P) at amino acid position 28 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Benign	0.061	T;T
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Pathogenic	0.31	D
MetaRNN	Benign	0.37	T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.81	D
PROVEAN	Benign	-0.43	N;N
REVEL	Benign	0.25
Sift	Pathogenic	0.0	D;D
Sift4G	Uncertain	0.010	D;D
Polyphen		0.99	.;D
Vest4		0.46
MutPred		0.46		Loss of disorder (P = 0.0663);Loss of disorder (P = 0.0663);
MVP		0.57
MPC		0.80
ClinPred		0.85	D
GERP RS		3.8
Varity_R		0.51
gMVP		0.80

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: rs2041263825; hg19: chrX-69665133;