rs979325432

Positions:

• chr19-10156397-G-C

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 3P and 8B. PM2 PP2 BP4_Strong BS2

The NM_001130823.3(DNMT1):​c.1393C>G​(p.Leu465Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000343 in 1,456,820 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: DNMT1 NM_001130823.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.327

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 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• 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=0.018721133).
• BS2: High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DNMT1	NM_001130823.3	c.1393C>G	p.Leu465Val	missense_variant	18/41	ENST00000359526.9	NP_001124295.1
DNMT1	NM_001318730.2	c.1345C>G	p.Leu449Val	missense_variant	17/40		NP_001305659.1
DNMT1	NM_001379.4	c.1345C>G	p.Leu449Val	missense_variant	17/40		NP_001370.1
DNMT1	NM_001318731.2	c.1030C>G	p.Leu344Val	missense_variant	18/41		NP_001305660.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DNMT1	ENST00000359526.9	c.1393C>G	p.Leu465Val	missense_variant	18/41	1	NM_001130823.3	ENSP00000352516.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000343 AC: 5 AN: 1456820 Hom.: 0 Cov.: 27 AF XY: 0.00000138 AC XY: 1 AN XY: 725036

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: 0.00000451

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

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

Labcorp Genetics (formerly Invitae), Labcorp

Jan 15, 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. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. ClinVar contains an entry for this variant (Variation ID: 577611). This variant has not been reported in the literature in individuals affected with DNMT1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 465 of the DNMT1 protein (p.Leu465Val). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.071
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.54
CADD	Benign	9.7
DANN	Benign	0.19
DEOGEN2	Uncertain	0.46	T;.
Eigen	Benign	-0.99
Eigen_PC	Benign	-0.90
FATHMM_MKL	Benign	0.44	N
LIST_S2	Benign	0.80	T;T
M_CAP	Benign	0.0061	T
MetaRNN	Benign	0.019	T;T
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	0.23	N;.
PrimateAI	Benign	0.24	T
PROVEAN	Benign	0.16	N;N
REVEL	Benign	0.094
Sift	Benign	0.60	T;T
Sift4G	Benign	0.58	T;T
Polyphen		0.0	B;B
Vest4		0.029
MutPred		0.24		Gain of catalytic residue at L449 (P = 0.1277);.;
MVP		0.48
MPC		1.0
ClinPred		0.012	T
GERP RS		2.4
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.0
Varity_R		0.063
gMVP		0.80

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: rs979325432; hg19: chr19-10267073;