Genetic Variant MLH3:p.Pro844Arg (chr14-75047125-G-C) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_001040108.2(MLH3):c.2531C>G(p.Pro844Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,800 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P844L) has been classified as Benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

MLH3
NM_001040108.2 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.89

Publications

0 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:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.108534425).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MLH3	NM_001040108.2 link	c.2531C>G	p.Pro844Arg	missense_variant	Exon 2 of 13	ENST00000355774.7	NP_001035197.1	Q9UHC1-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
MLH3	ENST00000355774.7 link	c.2531C>G	p.Pro844Arg	missense_variant	Exon 2 of 13	5	NM_001040108.2	ENSP00000348020.2	Q9UHC1-1
MLH3	ENST00000380968.6 link	c.2531C>G	p.Pro844Arg	missense_variant	Exon 2 of 12	1		ENSP00000370355.3	Q9UHC1-2
MLH3	ENST00000556257.5 link	c.2531C>G	p.Pro844Arg	missense_variant	Exon 2 of 7	5		ENSP00000451540.1	G3V419
MLH3	ENST00000555671.1 link	n.77C>G		non_coding_transcript_exon_variant	Exon 1 of 2	5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461800

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727202

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39684

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53414

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1111952

Other (OTH)

AF:

0.00

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.027

BayesDel_noAF

Benign

-0.28

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Benign

0.095

T;.;.;T

Eigen

Benign

-0.30

Eigen_PC

Benign

-0.35

FATHMM_MKL

Benign

0.17

LIST_S2

Benign

0.79

T;T;T;.

M_CAP

Uncertain

0.086

MetaRNN

Benign

0.11

T;T;T;T

MetaSVM

Uncertain

-0.057

MutationAssessor

Benign

1.5

L;L;.;L

PhyloP100

1.9

PrimateAI

Benign

0.23

PROVEAN

Uncertain

-2.5

D;.;D;D

REVEL

Benign

0.18

Sift

Benign

0.061

T;.;T;T

Sift4G

Benign

0.12

T;T;T;T

Polyphen

0.0060

B;D;.;B

Vest4

0.21

MutPred

0.33

Gain of catalytic residue at L839 (P = 0.0047);Gain of catalytic residue at L839 (P = 0.0047);Gain of catalytic residue at L839 (P = 0.0047);Gain of catalytic residue at L839 (P = 0.0047);

MVP

0.81

MPC

0.37

ClinPred

0.47

GERP RS

4.1

PromoterAI

-0.0017

Neutral

(source)

Varity_R

0.13

gMVP

0.26

Mutation Taster

=298/2

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over