chr19-10180385-G-C

Position:

• chr19-10180385-G-C

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 1P and 9B. PP2 BP4_Strong BP6 BS2

The NM_001130823.3(DNMT1):​c.410C>G​(p.Thr137Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000205 in 1,613,560 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. T137M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
  • Exomes 𝑓: 0.000022 (0 hom.)
• Consequence: DNMT1 NM_001130823.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: -0.389

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 -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=0.06174344).
• BP6: Variant 19-10180385-G-C is Benign according to our data. Variant chr19-10180385-G-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 949009.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.
• BS2: High AC in GnomAdExome4 at 32 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DNMT1	NM_001130823.3	c.410C>G	p.Thr137Arg	missense_variant	4/41	ENST00000359526.9
DNMT1	NM_001318730.2	c.410C>G	p.Thr137Arg	missense_variant	4/40
DNMT1	NM_001379.4	c.410C>G	p.Thr137Arg	missense_variant	4/40
DNMT1	NM_001318731.2	c.47C>G	p.Thr16Arg	missense_variant	4/41

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DNMT1	ENST00000359526.9	c.410C>G	p.Thr137Arg	missense_variant	4/41	1	NM_001130823.3

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152056 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000358 AC: 9 AN: 251226 Hom.: 0 AF XY: 0.0000442 AC XY: 6 AN XY: 135828

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000326

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000264

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000219 AC: 32 AN: 1461504 Hom.: 0 Cov.: 31 AF XY: 0.0000261 AC XY: 19 AN XY: 727084

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000353

Gnomad4 SAS exome AF: 0.0000348

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000899

Gnomad4 OTH exome AF: 0.0000828

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152056 Hom.: 0 Cov.: 31 AF XY: 0.0000135 AC XY: 1 AN XY: 74266

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000192

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000264

ExAC AF: 0.0000494 AC: 6

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary sensory neuropathy-deafness-dementia syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 06, 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 sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 949009). This variant has not been reported in the literature in individuals affected with DNMT1-related conditions. This variant is present in population databases (rs377146699, gnomAD 0.04%). This sequence change replaces threonine, which is neutral and polar, with arginine, which is basic and polar, at codon 137 of the DNMT1 protein (p.Thr137Arg). -

Inborn genetic diseases Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 14, 2021

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	0.11
BayesDel_addAF	Benign	-0.47	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	5.6
DANN	Benign	0.97
DEOGEN2	Benign	0.36	T;.;.;T;T;.;T
Eigen	Benign	-0.67
Eigen_PC	Benign	-0.74
FATHMM_MKL	Benign	0.043	N
LIST_S2	Benign	0.70	T;T;T;T;T;T;T
M_CAP	Benign	0.029	D
MetaRNN	Benign	0.062	T;T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.34	N;N;.;.;.;.;.
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.21	N;N;.;.;.;.;.
REVEL	Benign	0.034
Sift	Benign	0.13	T;T;.;.;.;.;.
Sift4G	Benign	0.26	T;T;T;T;.;.;.
Polyphen		0.34	B;P;.;.;.;.;.
Vest4		0.23
MutPred		0.32		Loss of phosphorylation at T137 (P = 3e-04);Loss of phosphorylation at T137 (P = 3e-04);.;.;.;.;.;
MVP		0.36
MPC		0.47
ClinPred		0.036	T
GERP RS		-0.73
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.026
gMVP		0.37

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs377146699; hg19: chr19-10291061;