rs63750447

Variant names:

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 1P and 20B. PP3BP4_StrongBP6_Very_StrongBS1BS2

The NM_000249.4(MLH1):c.1151T>A(p.Val384Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00101 in 1,613,706 control chromosomes in the GnomAD database, including 21 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★★).

Frequency

Genomes: 𝑓 0.0011 ( 2 hom., cov: 31)

Exomes 𝑓: 0.0010 ( 19 hom. )

Consequence

MLH1
NM_000249.4 missense

Scores

Clinical Significance

Benign reviewed by expert panel B:23O:1

Conservation

PhyloP100: 7.34

Variant links:

Genes affected

MLH1 (HGNC:7127): (mutL homolog 1) The protein encoded by this gene can heterodimerize with mismatch repair endonuclease PMS2 to form MutL alpha, part of the DNA mismatch repair system. When MutL alpha is bound by MutS beta and some accessory proteins, the PMS2 subunit of MutL alpha introduces a single-strand break near DNA mismatches, providing an entry point for exonuclease degradation. The encoded protein is also involved in DNA damage signaling and can heterodimerize with DNA mismatch repair protein MLH3 to form MutL gamma, which is involved in meiosis. This gene was identified as a locus frequently mutated in hereditary nonpolyposis colon cancer (HNPCC). [provided by RefSeq, Aug 2017]

MLH1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -19 ACMG points.

PP3

Multiple lines of computational evidence support a deleterious effect 6: AlphaMissense, BayesDel_noAF, Cadd, Eigen, PROVEAN, REVEL [when max_spliceai, FATHMM_MKL, MetaRNN, MutationTaster was below the threshold]

BP4

Computational evidence support a benign effect (MetaRNN=0.010344982).

BP6

Variant 3-37025749-T-A is Benign according to our data. Variant chr3-37025749-T-A is described in ClinVar as [Benign]. Clinvar id is 41632.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr3-37025749-T-A is described in Lovd as [Benign]. Variant chr3-37025749-T-A is described in Lovd as [Likely_pathogenic]. Variant chr3-37025749-T-A is described in Lovd as [Pathogenic].

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.00105 (160/151822) while in subpopulation EAS AF= 0.03 (155/5172). AF 95% confidence interval is 0.0261. There are 2 homozygotes in gnomad4. There are 84 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 2 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MLH1	NM_000249.4 link	c.1151T>A	p.Val384Asp	missense_variant	Exon 12 of 19	ENST00000231790.8	NP_000240.1	P40692-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MLH1	ENST00000231790.8 link	c.1151T>A	p.Val384Asp	missense_variant	Exon 12 of 19	1	NM_000249.4	ENSP00000231790.3		P40692-1

Frequencies

GnomAD3 genomes

AF:

0.00105

AC:

160

AN:

151706

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000132

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.0299

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000949

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000963

GnomAD3 exomes

AF:

0.00271

AC:

682

AN:

251422

Hom.:

AF XY:

0.00259

AC XY:

352

AN XY:

135876

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000867

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0362

Gnomad SAS exome

AF:

0.000163

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00114

GnomAD4 exome

AF:

0.00101

AC:

1471

AN:

1461884

Hom.:

Cov.:

AF XY:

0.000954

AC XY:

694

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0347

Gnomad4 SAS exome

AF:

0.000162

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.00116

GnomAD4 genome

AF:

0.00105

AC:

160

AN:

151822

Hom.:

Cov.:

AF XY:

0.00113

AC XY:

AN XY:

74180

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.0300

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000949

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000953

Alfa

AF:

0.000214

Hom.:

Bravo

AF:

0.00142

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00278

AC:

337

Asia WGS

AF:

0.00982

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Benign

Submissions summary: Benign:23Other:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not specified

Benign:8Other:1

Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 28, 2016	Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: ExAC: 3.9% East Asian chromosomes -
Benign, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Feb 22, 2019	- -
not provided, no classification provided	reference population	ITMI	Sep 19, 2013	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Oct 03, 2013	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, Amsterdam University Medical Center	-	- -
Benign, no assertion criteria provided	clinical testing	Clinical Genetics, Academic Medical Center	-	- -
Benign, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Mar 04, 2025	- -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, no assertion criteria provided	clinical testing	Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)	-	- -

Colorectal cancer, hereditary nonpolyposis, type 2

Benign:3

Benign, criteria provided, single submitter	clinical testing	KCCC/NGS Laboratory, Kuwait Cancer Control Center	Jul 07, 2023	- -
Benign, criteria provided, single submitter	clinical testing	Counsyl	May 09, 2017	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Mar 06, 2018	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. -

not provided

Benign:3

Benign, no assertion criteria provided	research	Biesecker Lab/Clinical Genomics Section, National Institutes of Health	Jul 13, 2012	- -
Benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Nov 01, 2023	MLH1: BS1, BS2 -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Hereditary cancer-predisposing syndrome

Benign:3

Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Apr 07, 2015	- -
Benign, criteria provided, single submitter	curation	Sema4, Sema4	May 27, 2020	- -
Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 18, 2014	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. -

Breast and/or ovarian cancer

Benign:1

Benign, criteria provided, single submitter

clinical testing

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Feb 08, 2022

- -

Lynch syndrome 1

Benign:1

Benign, no assertion criteria provided

clinical testing

Pathway Genomics

Jul 24, 2014

- -

Muir-Torré syndrome;C1333991:Colorectal cancer, hereditary nonpolyposis, type 2;C5399763:Mismatch repair cancer syndrome 1

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

May 10, 2022

- -

Lynch syndrome

Benign:1

Benign, reviewed by expert panel

research

International Society for Gastrointestinal Hereditary Tumours (InSiGHT)

Sep 05, 2013

MAF >1% -

Hereditary nonpolyposis colorectal neoplasms

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 04, 2025

- -

Bile duct cancer

Benign:1

Benign, no assertion criteria provided

clinical testing

Department of Pathology and Laboratory Medicine, Sinai Health System

The MLH1 p.Val384Asp variant was identified in the literature and by our laboratory. It was identified in 104 of 3286 proband chromosomes (allele frequency 0.03) with different cancer types including colon, pancreatic and lung; and was identified in 53 of 2818 race-matched control chromosomes (allele frequency 0.03), increasing the likelihood that this is a benign variant in certain populations of origin (Chao 2008, Fan 2007, Kim 2010, Kim 2004, Ku 2002, Li 2005 , Lee 2005, Mei 2006, Ohsawa 2009, Shi 2003, Wang 2007, Wang 1998, Yan 2008 , Yap 2009, Yuan 2004,). The variant was also identified in dbSNP (ID: rs63750447) with a minor allele frequency of 0.009 (1000 Genomes Project), COSMIC, â€šÃ„ÃºMismatch Repair Genes Variant Databaseâ€šÃ„Ã¹, â€šÃ„ÃºInSiGHT Colon Cancer Databaseâ€šÃ„Ã¹, â€šÃ„ÃºZhejiang Colon Cancer Databaseâ€šÃ„Ã¹, ClinVar database, and UMD (2X as a neutral variant). The variant was identified in co-occurrence with pathogenic MLH1 variants by Lee (2005) (c.1459C > T (p.Arg487X)), by our laboratory (c.453+1G>T, r.spl?), and in a sample submitted to UMD (c.453+1G>T), increasing the likelihood that the p.Val384Asp variant does not have clinical importance. In addition, based on a personal communication with the Pathology Department of the University of Hong Kong, sequencing on normal population DNA from their locality (108 normal blood DNA), this variant was found in 7 individuals and was regarded as a non-pathogenic variant. Furthermore, the variant was classified as benign by 4 submitters to the ClinVar database: InSiGHT (reviewed by expert panel), GeneDX, Ambry Genetics, and the Biesecker Laboratory â€šÃ„Ã¬ ClinSeq Project. In summary, based on the above information, this variant meets our laboratory's criteria to be classified as benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

1.0

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Pathogenic

0.43

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.86

D;.;.;.;.;.

Eigen

Pathogenic

0.90

Eigen_PC

Pathogenic

0.84

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.97

D;D;.;.;.;D

MetaRNN

Benign

0.010

T;T;T;T;T;T

MetaSVM

Uncertain

0.52

MutationAssessor

Uncertain

2.6

M;.;.;.;.;.

PrimateAI

Uncertain

0.58

PROVEAN

Pathogenic

-5.6

D;D;D;D;D;D

REVEL

Pathogenic

0.73

Sift

Pathogenic

0.0

D;D;D;D;D;D

Sift4G

Pathogenic

0.0

D;D;D;D;D;D

Polyphen

1.0

D;.;.;.;.;.

Vest4

0.82

MVP

0.97

MPC

0.50

ClinPred

0.086

GERP RS

5.7

Varity_R

0.92

gMVP

0.84

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over