NM_001040108.2:c.8A>G

Variant names:

Variant summary

Our verdict is Benign. The variant received -16 ACMG points: 0P and 16B. BP6_Very_StrongBS1BS2

The NM_001040108.2(MLH3):c.8A>G(p.Lys3Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00166 in 1,613,958 control chromosomes in the GnomAD database, including 42 homozygotes. In-silico tool predicts a benign outcome for this variant. 13/23 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0084 ( 23 hom., cov: 33)

Exomes 𝑓: 0.00095 ( 19 hom. )

Consequence

MLH3
NM_001040108.2 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:12

Conservation

PhyloP100: 1.42

Publications

6 publications found

Variant links:

COSMIC-nc: COSV104587318

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 -16 ACMG points.

BP6

Variant 14-75049648-T-C is Benign according to our data. Variant chr14-75049648-T-C is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 238254.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00842 (1283/152318) while in subpopulation AFR AF = 0.0283 (1178/41558). AF 95% confidence interval is 0.027. There are 23 homozygotes in GnomAd4. There are 598 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 23 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MLH3	NM_001040108.2 link	c.8A>G	p.Lys3Arg	missense_variant	Exon 2 of 13	ENST00000355774.7	NP_001035197.1	Q9UHC1-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MLH3	ENST00000355774.7 link	c.8A>G	p.Lys3Arg	missense_variant	Exon 2 of 13	5	NM_001040108.2	ENSP00000348020.2		Q9UHC1-1

Frequencies

GnomAD3 genomes

AF:

0.00842

AC:

1282

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0284

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00438

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00949

Gnomad NFE

AF:

0.000265

Gnomad OTH

AF:

0.00718

GnomAD2 exomes

AF:

0.00228

AC:

571

AN:

250216

AF XY:

0.00171

show subpopulations

Gnomad AFR exome

AF:

0.0281

Gnomad AMR exome

AF:

0.00215

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000292

Gnomad OTH exome

AF:

0.00180

GnomAD4 exome

AF:

0.000952

AC:

1392

AN:

1461640

Hom.:

Cov.:

AF XY:

0.000811

AC XY:

590

AN XY:

727100

show subpopulations

African (AFR)

AF:

0.0285

AC:

955

AN:

33478

American (AMR)

AF:

0.00260

AC:

116

AN:

44678

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000928

AC:

AN:

86224

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53398

Middle Eastern (MID)

AF:

0.00208

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000151

AC:

168

AN:

1111878

Other (OTH)

AF:

0.00220

AC:

133

AN:

60390

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

Heterozygous variant carriers

148

221

295

369

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

114

152

190

<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:

0.00842

AC:

1283

AN:

152318

Hom.:

Cov.:

AF XY:

0.00803

AC XY:

598

AN XY:

74488

show subpopulations

African (AFR)

AF:

0.0283

AC:

1178

AN:

41558

American (AMR)

AF:

0.00438

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.000207

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.0000942

AC:

AN:

10616

Middle Eastern (MID)

AF:

0.0102

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000265

AC:

AN:

68036

Other (OTH)

AF:

0.00710

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

131

197

262

328

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<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:

0.00314

Hom.:

Bravo

AF:

0.00934

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.0300

AC:

132

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.00272

AC:

330

Asia WGS

AF:

0.00318

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:12

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:5

Genome Diagnostics Laboratory, Amsterdam University Medical Center

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Mayo Clinic Laboratories, Mayo Clinic

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Clinical Genetics, Academic Medical Center

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Jul 30, 2020

Ambry Genetics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as 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. -

Colorectal cancer, hereditary nonpolyposis, type 7

Benign:3

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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 likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Jul 07, 2023

KCCC/NGS Laboratory, Kuwait Cancer Control Center

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:2

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

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

Benign:1

Nov 11, 2021

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Endometrial carcinoma

Benign:1

Feb 01, 2025

KCCC/NGS Laboratory, Kuwait Cancer Control Center

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.075

BayesDel_addAF

Benign

-0.43

BayesDel_noAF

Benign

-0.37

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.099

T;.;.;T;.;.

Eigen

Benign

-0.49

Eigen_PC

Benign

-0.28

FATHMM_MKL

Uncertain

0.88

LIST_S2

Benign

0.76

T;T;T;.;T;T

MetaRNN

Benign

0.0086

T;T;T;T;T;T

MetaSVM

Benign

-0.81

MutationAssessor

Benign

0.15

N;N;.;N;.;.

PhyloP100

1.4

PrimateAI

Uncertain

0.49

PROVEAN

Benign

-0.64

N;.;N;N;N;N

REVEL

Benign

0.22

Sift

Benign

0.59

T;.;T;T;T;T

Sift4G

Benign

0.48

T;T;T;T;.;.

Polyphen

0.0080

B;B;.;B;.;.

Vest4

0.087

MVP

0.83

MPC

0.085

ClinPred

0.0046

GERP RS

3.2

Varity_R

0.041

gMVP

0.29

Mutation Taster

=300/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.34

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.34

Position offset: 0

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over