4-87657053-G-T

Variant names:

• chr4-87657053-G-T
• rs1191357776
• NM_004407.4:c.76G>T

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PVS1_Strong PM2

The NM_004407.4(DMP1):​c.76G>T​(p.Glu26*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000711 in 1,407,230 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: 7.1e-7 (0 hom.)
• Consequence: DMP1 NM_004407.4 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.60
• Publications: 0 publications found

Genes affected

DMP1 (HGNC:2932): (dentin matrix acidic phosphoprotein 1) Dentin matrix acidic phosphoprotein is an extracellular matrix protein and a member of the small integrin binding ligand N-linked glycoprotein family. This protein, which is critical for proper mineralization of bone and dentin, is present in diverse cells of bone and tooth tissues. The protein contains a large number of acidic domains, multiple phosphorylation sites, a functional arg-gly-asp cell attachment sequence, and a DNA binding domain. In undifferentiated osteoblasts it is primarily a nuclear protein that regulates the expression of osteoblast-specific genes. During osteoblast maturation the protein becomes phosphorylated and is exported to the extracellular matrix, where it orchestrates mineralized matrix formation. Mutations in the gene are known to cause autosomal recessive hypophosphatemia, a disease that manifests as rickets and osteomalacia. The gene structure is conserved in mammals. Two transcript variants encoding different isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

DMP1 Gene-Disease associations (from GenCC):

• hypophosphatemic rickets, autosomal recessive, 1

  Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• autosomal recessive hypophosphatemic rickets

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

DMP1-AS1 (HGNC:58144):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 9 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004407.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DMP1	NM_004407.4	MANE Select	c.76G>T	p.Glu26*	stop_gained	Exon 3 of 6	NP_004398.1	Q13316-1
	DMP1	NM_001079911.3		c.76G>T	p.Glu26*	stop_gained	Exon 3 of 5	NP_001073380.1	Q13316-2
	DMP1-AS1	NR_198971.1		n.366+15937C>A		intron	N/A

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DMP1	ENST00000339673.11	TSL:1 MANE Select	c.76G>T	p.Glu26*	stop_gained	Exon 3 of 6	ENSP00000340935.6	Q13316-1
	DMP1	ENST00000282479.8	TSL:1	c.76G>T	p.Glu26*	stop_gained	Exon 3 of 5	ENSP00000282479.6	Q13316-2
	DMP1	ENST00000682752.1		n.76G>T		non_coding_transcript_exon	Exon 3 of 7	ENSP00000507436.1	A0A804HJB8

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.11e-7 AC: 1 AN: 1407230 Hom.: 0 Cov.: 25 AF XY: 0.00000142 AC XY: 1 AN XY: 703118

African (AFR) AF: 0.00 AC: 0 AN: 32464

American (AMR) AF: 0.00 AC: 0 AN: 44620

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25754

East Asian (EAS) AF: 0.00 AC: 0 AN: 39348

South Asian (SAS) AF: 0.00 AC: 0 AN: 84744

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53306

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5654

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1062828

Other (OTH) AF: 0.0000171 AC: 1 AN: 58512

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.31
CADD	Pathogenic	34
DANN	Uncertain	1.0
Eigen	Uncertain	0.57
Eigen_PC	Uncertain	0.29
FATHMM_MKL	Benign	0.59	D
PhyloP100		1.6
Vest4		0.84
GERP RS		4.8
Mutation Taster		=46/154	disease causing (fs/PTC)

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

Other links and lift over

dbSNP: rs1191357776; hg19: chr4-88578205;