4-87610957-C-T

Variant names:

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM2PM5PP3PP5_Moderate

The NM_014208.3(DSPP):c.49C>T(p.Pro17Ser) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,168 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P17T) has been classified as Pathogenic.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

DSPP
NM_014208.3 missense, splice_region

Scores

Splicing: ADA: 0.9948

Clinical Significance

Pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: 3.56

Publications

19 publications found

Variant links:

Genes affected

DSPP (HGNC:3054): (dentin sialophosphoprotein) This gene encodes a member of the small integrin-binding ligand N-linked glycoprotein (SIBLING) family of proteins. The encoded preproprotein is secreted by odontoblasts and proteolytically processed to generate two principal proteins of the dentin extracellular matrix of the tooth, dentin sialoprotein and dentin phosphoprotein. These two protein products may play distinct but related roles in dentin mineralization. Mutations in this gene are associated with dentinogenesis imperfecta and dentin dysplasia. This gene is present in a gene cluster on chromosome 4. Allelic differences due to repeat polymorphisms have been found for this gene. [provided by RefSeq, Jan 2016]

DSPP Gene-Disease associations (from GenCC):

deafness, autosomal dominant 39, with dentinogenesis imperfecta 1
Inheritance: AD, Unknown Classification: DEFINITIVE, MODERATE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), PanelApp Australia
dentinogenesis imperfecta
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
dentinogenesis imperfecta type 2
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P
dentinogenesis imperfecta type 3
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
dentin dysplasia type I
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
dentin dysplasia type II
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

DSPP links:

ENSG00000249001 (HGNC:58144):

ENSG00000249001 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr4-87610958-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 2734658.Status of the report is criteria_provided_single_submitter, 1 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.79

PP5

Variant 4-87610957-C-T is Pathogenic according to our data. Variant chr4-87610957-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 1458861.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DSPP	NM_014208.3 link	c.49C>T	p.Pro17Ser	missense_variant, splice_region_variant	Exon 2 of 5	ENST00000651931.1	NP_055023.2	Q9NZW4
DMP1-AS1	NR_198971.1 link	n.367-42424G>A		intron_variant	Intron 3 of 3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DSPP	ENST00000651931.1 link	c.49C>T	p.Pro17Ser	missense_variant, splice_region_variant	Exon 2 of 5		NM_014208.3	ENSP00000498766.1		Q9NZW4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000401

AC:

AN:

249370

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.0000646

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461168

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726934

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000299

AC:

AN:

33452

American (AMR)

AF:

0.00

AC:

AN:

44720

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39668

South Asian (SAS)

AF:

0.00

AC:

AN:

86228

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111432

Other (OTH)

AF:

0.00

AC:

AN:

60368

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Pathogenic:1

Feb 14, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 17 of the DSPP protein (p.Pro17Ser). This variant is present in population databases (no rsID available, gnomAD 0.007%). This missense change has been observed in individuals with dentinogenesis imperfecta (PMID: 17686168, 18521831; Invitae). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 1458861). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.55

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.33

CADD

Pathogenic

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.11

Eigen

Uncertain

0.56

Eigen_PC

Uncertain

0.56

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.60

M_CAP

Benign

0.079

MetaRNN

Pathogenic

0.79

MetaSVM

Uncertain

0.70

MutationAssessor

Uncertain

2.0

PhyloP100

3.6

PROVEAN

Benign

-1.9

REVEL

Uncertain

0.60

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.69

MutPred

0.53

Loss of catalytic residue at P17 (P = 0.0265);

MVP

0.89

ClinPred

0.80

GERP RS

4.9

Varity_R

0.46

gMVP

0.31

Mutation Taster

=71/29

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

0.99

dbscSNV1_RF

Benign

0.63

Splicevardb

2.0

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over