4-70631707-T-G

Position:

• chr4-70631707-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_031889.3(ENAM):​c.92T>G​(p.Leu31Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,366 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: ENAM NM_031889.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 2.42

Genes affected

ENAM (HGNC:3344): (enamelin) Dental enamel forms the outer cap of teeth and is the hardest substance found in vertebrates. This gene encodes the largest protein in the enamel matrix of developing teeth. The protein is involved in the mineralization and structural organization of enamel. Defects in this gene result in amelogenesis imperfect type 1C.[provided by RefSeq, Oct 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.856
• PP5: Variant 4-70631707-T-G is Pathogenic according to our data. Variant chr4-70631707-T-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 374930.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ENAM	NM_031889.3	c.92T>G	p.Leu31Arg	missense_variant	3/9	ENST00000396073.4	NP_114095.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ENAM	ENST00000396073.4	c.92T>G	p.Leu31Arg	missense_variant	3/9	1	NM_031889.3	ENSP00000379383	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461366 Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2 AN XY: 727018

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Amelogenesis imperfecta - hypoplastic autosomal dominant - local Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Aug 03, 2017	- -
Likely pathogenic, no assertion criteria provided	research	Leeds Amelogenesis Imperfecta Research Group, University of Leeds	May 11, 2016	Variant identified in 5 families with amelogenesis imperfecta, variant segregates with phenotype in all cases. Pathogenicity predictions by SIFT, Polyphen-2 (HumVar), Mutation Taster, CADD v1.3 and Grantham score all suggest that the NM_031889.2:c.92T>G substitution may be pathogenic. The affected residue lies within the signal peptide sequence of ENAM. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.83
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.19
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.43	T
Eigen	Uncertain	0.65
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.72	T
M_CAP	Uncertain	0.15	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Uncertain	-0.067	T
MutationAssessor	Uncertain	2.2	M
MutationTaster	Benign	0.98	D
PrimateAI	Uncertain	0.55	T
PROVEAN	Benign	-0.90	N
REVEL	Uncertain	0.50
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.94
MutPred		0.60		Gain of MoRF binding (P = 0.007);
MVP		0.90
MPC		0.16
ClinPred		0.98	D
GERP RS		5.5
Varity_R		0.53
gMVP		0.46

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs1060499539; hg19: chr4-71497424;