19-10180413-G-T

Position:

chr19-10180413-G-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 1P and 9B. PP2BP4_StrongBP6BS2

The NM_001130823.3(DNMT1):c.382C>A(p.Pro128Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000271 in 1,613,924 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P128S) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00020 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00028 ( 0 hom. )

Consequence

DNMT1
NM_001130823.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:3

Conservation

PhyloP100: 0.162

Variant links:

Genes affected

DNMT1 (HGNC:2976): (DNA methyltransferase 1) This gene encodes an enzyme that transfers methyl groups to cytosine nucleotides of genomic DNA. This protein is the major enzyme responsible for maintaining methylation patterns following DNA replication and shows a preference for hemi-methylated DNA. Methylation of DNA is an important component of mammalian epigenetic gene regulation. Aberrant methylation patterns are found in human tumors and associated with developmental abnormalities. Variation in this gene has been associated with cerebellar ataxia, deafness, and narcolepsy, and neuropathy, hereditary sensory, type IE. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2016]

DNMT1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), DNMT1. . Gene score misZ 4.9903 (greater than the threshold 3.09). Trascript score misZ 7.3302 (greater than threshold 3.09). GenCC has associacion of gene with hereditary sensory neuropathy-deafness-dementia syndrome, autosomal dominant cerebellar ataxia, deafness and narcolepsy.

BP4

Computational evidence support a benign effect (MetaRNN=0.06353301).

BP6

Variant 19-10180413-G-T is Benign according to our data. Variant chr19-10180413-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 246583.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=2, Benign=1}. Variant chr19-10180413-G-T is described in Lovd as [Likely_benign].

BS2

High AC in GnomAd4 at 31 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE
DNMT1	NM_001130823.3 linkuse as main transcript	c.382C>A	p.Pro128Thr	missense_variant	4/41	ENST00000359526.9
DNMT1	NM_001318730.2 linkuse as main transcript	c.382C>A	p.Pro128Thr	missense_variant	4/40
DNMT1	NM_001379.4 linkuse as main transcript	c.382C>A	p.Pro128Thr	missense_variant	4/40
DNMT1	NM_001318731.2 linkuse as main transcript	c.19C>A	p.Pro7Thr	missense_variant	4/41

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNMT1	ENST00000359526.9 linkuse as main transcript	c.382C>A	p.Pro128Thr	missense_variant	4/41	1	NM_001130823.3		P26358-2

Frequencies

GnomAD3 genomes

AF:

0.000204

AC:

AN:

152098

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000367

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000175

AC:

AN:

251442

Hom.:

AF XY:

0.000169

AC XY:

AN XY:

135908

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000325

Gnomad OTH exome

AF:

0.000326

GnomAD4 exome

AF:

0.000278

AC:

406

AN:

1461826

Hom.:

Cov.:

AF XY:

0.000257

AC XY:

187

AN XY:

727224

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000112

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000340

Gnomad4 OTH exome

AF:

0.000348

GnomAD4 genome

AF:

0.000204

AC:

AN:

152098

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74310

show subpopulations

Gnomad4 AFR

AF:

0.000145

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000367

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000224

Hom.:

Bravo

AF:

0.000264

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.00

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000581

AC:

ExAC

AF:

0.000165

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000415

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Hereditary sensory neuropathy-deafness-dementia syndrome

Uncertain:1Benign:2

Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 02, 2024	This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 128 of the DNMT1 protein (p.Pro128Thr). This variant is present in population databases (rs146601335, gnomAD 0.03%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with DNMT1-related conditions. ClinVar contains an entry for this variant (Variation ID: 246583). 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 tolerated. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Likely benign, criteria provided, single submitter	clinical testing	Victorian Clinical Genetics Services, Murdoch Childrens Research Institute	May 01, 2020	Based on the classification scheme VCGS_Germline_v1.1.1, this variant is classified as likely benign. Following criteria are met: 0102 - Loss-of-function is a known mechanism of disease for this gene. (N) 0107 - This gene is known to be associated with autosomal dominant disease. (N) 0200 - Variant is predicted to result in a missense amino acid change from proline to threonine (exon 4). (N) 0251 - Variant is heterozygous. (N) 0302 - Variant is present in gnomAD <0.001 for a dominant condition (48 heterozygotes, 0 homozygotes). (P) 0309 - Multiple alternative amino acid changes at the same position have been observed in gnomAD (highest allele frequency: 9 heterozygotes, 0 homozygotes). (N) 0503 - Missense variant consistently predicted to be tolerated or not conserved in mammals with a minor amino acid change. (B) 0504 - Same amino acid change has been observed in mammals. (B) 0600 - Variant is located in an annotated domain or motif (MIP-T3 superfamily; NCBI). (N) 0708 - Comparable variant (p.Pro128Ser) has been reported as a VUS (ClinVar). (N) 0806 – This variant has been reported as both likely benign (LOVD) and as a VUS (ClinVar). (N) 0905 - No segregation evidence has been identified for this variant in the literature. (N) 1007 - No published functional evidence has been identified for this variant. (N) 1208 - Inheritance information for this variant is not currently available. (N) Legend: (P) - Pathogenic, (N) - Neutral, (B) - Benign -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 04, 2017

A variant of uncertain significance has been identified in the DNMT1 gene. The P128T variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The P128T variant is observed in 18/66,718 (0.03%) alleles from individuals of European background (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The P128T variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. However, this substitution occurs at a position that is not conserved, and in silico analysis predicts this variant likely does not alter the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -

Inborn genetic diseases

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 18, 2019

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.056

BayesDel_addAF

Benign

-0.50

BayesDel_noAF

Benign

-0.65

CADD

Benign

2.0

DANN

Benign

0.77

DEOGEN2

Uncertain

0.49

T;.;.;T;T;.;T

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.053

LIST_S2

Benign

0.75

T;T;T;T;T;T;T

M_CAP

Benign

0.018

MetaRNN

Benign

0.064

T;T;T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.81

L;L;.;.;.;.;.

MutationTaster

Benign

1.0

N;N;N

PrimateAI

Benign

0.25

PROVEAN

Benign

-0.54

N;N;.;.;.;.;.

REVEL

Benign

0.011

Sift

Benign

0.26

T;D;.;.;.;.;.

Sift4G

Benign

0.34

T;T;T;T;.;.;.

Polyphen

0.19

B;B;.;.;.;.;.

Vest4

0.11

MVP

0.32

MPC

0.46

ClinPred

0.030

GERP RS

-2.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.2

Varity_R

0.019

gMVP

0.27

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over