3-37025608-ATTTTTTTTT-ATTTTTTTTTTTTT

Variant names:

Variant summary

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

The NM_000249.4(MLH1):c.1039-11_1039-8dupTTTT variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00052 ( 0 hom., cov: 0)

Exomes 𝑓: 0.0011 ( 7 hom. )

Consequence

MLH1
NM_000249.4 splice_region, intron

Scores

Not classified

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:4

Conservation

PhyloP100: -0.0340

Publications

1 publications found

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 Gene-Disease associations (from GenCC):

Lynch syndrome
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, ClinGen, Orphanet
Lynch syndrome 2
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp
Muir-Torre syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Genomics England PanelApp, Ambry Genetics, G2P, Orphanet
mismatch repair cancer syndrome 1
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae), Orphanet, ClinGen
Lynch syndrome 1
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
ovarian cancer
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
malignant pancreatic neoplasm
Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
rhabdomyosarcoma
Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
prostate cancer
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
breast cancer
Inheritance: AD Classification: NO_KNOWN Submitted by: Ambry Genetics
hereditary breast carcinoma
Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

MLH1 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 3-37025608-A-ATTTT is Benign according to our data. Variant chr3-37025608-A-ATTTT is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 433862.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.000518 (25/48266) while in subpopulation EAS AF = 0.00291 (6/2060). AF 95% confidence interval is 0.00127. There are 0 homozygotes in GnomAd4. There are 11 alleles in the male GnomAd4 subpopulation. Median coverage is 0. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 7 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MLH1	NM_000249.4 link	c.1039-11_1039-8dupTTTT		splice_region_variant, intron_variant	Intron 11 of 18	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.1039-29_1039-28insTTTT		intron_variant	Intron 11 of 18	1	NM_000249.4	ENSP00000231790.3		P40692-1

Frequencies

GnomAD3 genomes

AF:

0.000518

AC:

AN:

48278

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000333

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000921

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00289

Gnomad SAS

AF:

0.000745

Gnomad FIN

AF:

0.00114

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000382

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00201

AC:

AN:

13956

AF XY:

0.00155

show subpopulations

Gnomad AFR exome

AF:

0.0224

Gnomad AMR exome

AF:

0.00144

Gnomad ASJ exome

AF:

0.000773

Gnomad EAS exome

AF:

0.0222

Gnomad FIN exome

AF:

0.00239

Gnomad NFE exome

AF:

0.00114

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00108

AC:

278

AN:

258116

Hom.:

Cov.:

AF XY:

0.00110

AC XY:

141

AN XY:

128114

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00210

AC:

AN:

3328

American (AMR)

AF:

0.00314

AC:

AN:

1274

Ashkenazi Jewish (ASJ)

AF:

0.00240

AC:

AN:

2086

East Asian (EAS)

AF:

0.00329

AC:

AN:

3036

South Asian (SAS)

AF:

0.00398

AC:

AN:

5282

European-Finnish (FIN)

AF:

0.00245

AC:

AN:

1222

Middle Eastern (MID)

AF:

0.00191

AC:

AN:

524

European-Non Finnish (NFE)

AF:

0.000911

AC:

212

AN:

232642

Other (OTH)

AF:

0.00172

AC:

AN:

8722

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.346

Heterozygous variant carriers

102

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

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

GnomAD4 genome

AF:

0.000518

AC:

AN:

48266

Hom.:

Cov.:

AF XY:

0.000512

AC XY:

AN XY:

21484

show subpopulations

African (AFR)

AF:

0.000332

AC:

AN:

12042

American (AMR)

AF:

0.000921

AC:

AN:

3256

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

1520

East Asian (EAS)

AF:

0.00291

AC:

AN:

2060

South Asian (SAS)

AF:

0.000749

AC:

AN:

1336

European-Finnish (FIN)

AF:

0.00114

AC:

AN:

876

Middle Eastern (MID)

AF:

0.00

AC:

AN:

European-Non Finnish (NFE)

AF:

0.000382

AC:

AN:

26184

Other (OTH)

AF:

0.00

AC:

AN:

606

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.445

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:

0.00

Hom.:

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Aug 13, 2013

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:1

Mar 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

MLH1: BP4, BS2 -

Hereditary nonpolyposis colorectal neoplasms

Benign:1

Feb 05, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.034

La Branchor

0.24

BranchPoint Hunter

2.0

Mutation Taster

=100/0

polymorphism

(source)

Splicing

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