rs28756987

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_001040108.2(MLH3):c.1939C>T(p.Arg647Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000333 in 1,614,136 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/22 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. R647H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0015 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00021 ( 1 hom. )

Consequence

MLH3
NM_001040108.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:4

Conservation

PhyloP100: -0.836

Publications

9 publications found

Variant links:

Genes affected

MLH3 (HGNC:7128): (mutL homolog 3) This gene is a member of the MutL-homolog (MLH) family of DNA mismatch repair (MMR) genes. MLH genes are implicated in maintaining genomic integrity during DNA replication and after meiotic recombination. The protein encoded by this gene functions as a heterodimer with other family members. Somatic mutations in this gene frequently occur in tumors exhibiting microsatellite instability, and germline mutations have been linked to hereditary nonpolyposis colorectal cancer type 7 (HNPCC7). Several alternatively spliced transcript variants have been identified, but the full-length nature of only two transcript variants has been determined. [provided by RefSeq, Jul 2008]

MLH3 Gene-Disease associations (from GenCC):

colorectal cancer, hereditary nonpolyposis, type 7
Inheritance: AD, AR Classification: MODERATE, LIMITED Submitted by: Ambry Genetics, ClinGen, Laboratory for Molecular Medicine

MLH3 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0051731765).

BP6

Variant 14-75047717-G-A is Benign according to our data. Variant chr14-75047717-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 238246.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00155 (236/152316) while in subpopulation AFR AF = 0.00539 (224/41578). AF 95% confidence interval is 0.00481. There are 0 homozygotes in GnomAd4. There are 124 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001040108.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MLH3	NM_001040108.2	MANE Select	c.1939C>T	p.Arg647Cys	missense	Exon 2 of 13	NP_001035197.1
	MLH3	NM_014381.3		c.1939C>T	p.Arg647Cys	missense	Exon 2 of 12	NP_055196.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
MLH3	ENST00000355774.7	TSL:5 MANE Select	c.1939C>T	p.Arg647Cys	missense	Exon 2 of 13	ENSP00000348020.2
MLH3	ENST00000380968.6	TSL:1	c.1939C>T	p.Arg647Cys	missense	Exon 2 of 12	ENSP00000370355.3
MLH3	ENST00000556257.5	TSL:5	c.1939C>T	p.Arg647Cys	missense	Exon 2 of 7	ENSP00000451540.1

Frequencies

GnomAD3 genomes

AF:

0.00154

AC:

235

AN:

152198

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00538

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000393

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:

0.0000147

Gnomad OTH

AF:

0.00191

GnomAD2 exomes

AF:

0.000395

AC:

AN:

250932

AF XY:

0.000302

show subpopulations

Gnomad AFR exome

AF:

0.00474

Gnomad AMR exome

AF:

0.000463

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000353

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000206

AC:

301

AN:

1461820

Hom.:

Cov.:

AF XY:

0.000187

AC XY:

136

AN XY:

727202

show subpopulations

African (AFR)

AF:

0.00523

AC:

175

AN:

33478

American (AMR)

AF:

0.000447

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39686

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53402

Middle Eastern (MID)

AF:

0.000347

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000755

AC:

AN:

1111986

Other (OTH)

AF:

0.000315

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.458

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00155

AC:

236

AN:

152316

Hom.:

Cov.:

AF XY:

0.00166

AC XY:

124

AN XY:

74488

show subpopulations

African (AFR)

AF:

0.00539

AC:

224

AN:

41578

American (AMR)

AF:

0.000392

AC:

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.000193

AC:

AN:

5190

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68024

Other (OTH)

AF:

0.00189

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.510

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000625

Hom.:

Bravo

AF:

0.00171

ESP6500AA

AF:

0.00454

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000494

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.000164

EpiControl

AF:

0.0000593

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Colorectal cancer, hereditary nonpolyposis, type 7 (2)

not provided (2)

not specified (2)

Colorectal cancer;C0476089:Endometrial carcinoma;C1858380:Colorectal cancer, hereditary nonpolyposis, type 7 (1)

Endometrial carcinoma (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.060

BayesDel_addAF

Benign

-0.69

BayesDel_noAF

Benign

-0.76

CADD

Benign

0.49

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.11

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.027

LIST_S2

Benign

0.32

M_CAP

Benign

0.014

MetaRNN

Benign

0.0052

MetaSVM

Benign

-0.99

MutationAssessor

Benign

0.090

PhyloP100

-0.84

PrimateAI

Benign

0.17

PROVEAN

Benign

-1.3

REVEL

Benign

0.10

Sift

Benign

0.070

Sift4G

Benign

0.082

Polyphen

0.0

Vest4

0.057

MVP

0.39

MPC

0.14

ClinPred

0.0094

GERP RS

-6.4

Varity_R

0.037

gMVP

0.23

Mutation Taster

=97/3

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over