18-31134631-G-T

Variant names:

• chr18-31134631-G-T
• NM_024421.2:c.1817C>A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_024421.2(DSC1):​c.1817C>A​(p.Pro606His) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,460,602 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DSC1 NM_024421.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.41

Genes affected

DSC1 (HGNC:3035): (desmocollin 1) The protein encoded by this gene is a calcium-dependent glycoprotein that is a member of the desmocollin subfamily of the cadherin superfamily. These desmosomal family members, along with the desmogleins, are found primarily in epithelial cells where they constitute the adhesive proteins of the desmosome cell-cell junction and are required for cell adhesion and desmosome formation. A subtype of IgA pemphigus, a life-threatening autoimmune disease, is characterized by the presence of autoantibodies that target the encoded protein. The desmosomal family members are arranged in two clusters on chromosome 18. Alternative splicing of this gene results in multiple transcript variants. At least one of these variants encodes a preproprotein that is proteolytically processed to generate the mature protein. [provided by RefSeq, Nov 2015]

DSCAS (HGNC:51116): (DSC1/DSC2 antisense RNA)

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.877

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DSC1	NM_024421.2	c.1817C>A	p.Pro606His	missense_variant	Exon 12 of 16	ENST00000257198.6	NP_077739.1
DSC1	NM_004948.3	c.1817C>A	p.Pro606His	missense_variant	Exon 12 of 17		NP_004939.1
DSCAS	NR_110785.1	n.209-16168G>T		intron_variant	Intron 2 of 3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DSC1	ENST00000257198.6	c.1817C>A	p.Pro606His	missense_variant	Exon 12 of 16	2	NM_024421.2	ENSP00000257198.6
DSC1	ENST00000257197.7	c.1817C>A	p.Pro606His	missense_variant	Exon 12 of 17	1		ENSP00000257197.3
DSCAS	ENST00000581836.2	n.225-16168G>T		intron_variant	Intron 2 of 3	4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460602 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 726538

Gnomad4 AFR exome AF: 0.0000299

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.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.78
BayesDel_addAF	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.53	.;D
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Benign	0.018	T
MetaRNN	Pathogenic	0.88	D;D
MetaSVM	Uncertain	0.13	D
MutationAssessor	Uncertain	2.7	M;M
PrimateAI	Benign	0.42	T
PROVEAN	Pathogenic	-7.4	D;D
REVEL	Uncertain	0.52
Sift	Pathogenic	0.0	D;D
Sift4G	Uncertain	0.0020	D;D
Polyphen		1.0	.;D
Vest4		0.77
MutPred		0.69		Loss of glycosylation at P606 (P = 0.0418);Loss of glycosylation at P606 (P = 0.0418);
MVP		0.87
MPC		0.41
ClinPred		1.0	D
GERP RS		5.6
Varity_R		0.93
gMVP		0.85

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr18-28714594;