19-10133682-T-A

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 1P and 8B. PP2 BP4_Strong BS2

The NM_001130823.3(DNMT1):c.4884A>T(p.Glu1628Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000257 in 1,597,334 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 Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000033 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000025 (0 hom.)
• Consequence: DNMT1 NM_001130823.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.725

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]

ACMG classification

Verdict is Benign. Variant got -7 ACMG points.

• PP2: Missense variant where missense usually causes diseases, DNMT1
• BP4: Computational evidence support a benign effect (MetaRNN=0.03817755).
• BS2: High AC in GnomAd at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DNMT1	NM_001130823.3	c.4884A>T	p.Glu1628Asp	missense_variant	41/41	ENST00000359526.9
DNMT1	NM_001318730.2	c.4845A>T	p.Glu1615Asp	missense_variant	40/40
DNMT1	NM_001379.4	c.4836A>T	p.Glu1612Asp	missense_variant	40/40
DNMT1	NM_001318731.2	c.4521A>T	p.Glu1507Asp	missense_variant	41/41

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNMT1	ENST00000359526.9	c.4884A>T	p.Glu1628Asp	missense_variant	41/41	1	NM_001130823.3

Frequencies

GnomAD3 genomes AF: 0.0000329 AC: 5 AN: 152184 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000482

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: 0.0000441

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00000455 AC: 1 AN: 219686 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 118590

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000105

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000249 AC: 36 AN: 1445150 Hom.: 0 Cov.: 31 AF XY: 0.0000251 AC XY: 18 AN XY: 717168

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: 0.0000120

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000308

Gnomad4 OTH exome AF: 0.0000167

GnomAD4 genome AF: 0.0000329 AC: 5 AN: 152184 Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3 AN XY: 74348

Gnomad4 AFR AF: 0.0000482

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: 0.0000441

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.0000189

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary sensory neuropathy-deafness-dementia syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 10, 2022

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. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt DNMT1 protein function. This variant has not been reported in the literature in individuals affected with DNMT1-related conditions. This variant is present in population databases (rs370070174, gnomAD 0.005%). This sequence change replaces glutamic acid, which is acidic and polar, with aspartic acid, which is acidic and polar, at codon 1628 of the DNMT1 protein (p.Glu1628Asp). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.62
Cadd	Benign	11
Dann	Benign	0.90
DEOGEN2	Uncertain	0.42	T;.
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.023	N
LIST_S2	Benign	0.61	T;T
M_CAP	Benign	0.018	T
MetaRNN	Benign	0.038	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.1	L;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-0.78	N;N
REVEL	Benign	0.014
Sift	Benign	0.10	T;T
Sift4G	Benign	0.48	T;T
Polyphen		0.0010	B;B
Vest4		0.15
MVP		0.33
MPC		0.93
ClinPred		0.044	T
GERP RS		-7.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.039
gMVP		0.33

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

Other links and lift over

dbSNP: rs370070174; hg19: chr19-10244358;