rs587778992

chr3-37050606-C-Achr3-37050606-C-Gchr3-37050606-C-T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The ENST00000413740.2(MLH1):c.1788C>A(p.Cys596Ter) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. C596C) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MLH1 ENST00000413740.2 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.70

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]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 24 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MLH1	NM_000249.4	c.2224C>A	p.Gln742Lys	missense_variant	19/19	ENST00000231790.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MLH1	ENST00000231790.8	c.2224C>A	p.Gln742Lys	missense_variant	19/19	1	NM_000249.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.42
Cadd	Uncertain	24
Dann	Uncertain	0.98
DEOGEN2	Uncertain	0.78	D;.;.;.;.;.
Eigen	Uncertain	0.41
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.97	D;D;.;.;.;D
M_CAP	Uncertain	0.18	D
MetaRNN	Pathogenic	0.85	D;D;D;D;D;D
MetaSVM	Uncertain	0.46	D
MutationAssessor	Uncertain	2.4	M;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-2.7	D;.;D;D;D;D
REVEL	Pathogenic	0.74
Sift	Benign	0.076	T;.;T;T;T;T
Sift4G	Benign	0.083	T;T;T;T;T;T
Polyphen		0.39	B;.;.;.;.;.
Vest4		0.81
MutPred		0.69		Gain of ubiquitination at Q742 (P = 0.0155);.;.;.;.;.;
MVP		0.98
MPC		0.18
ClinPred		0.97	D
GERP RS		5.4
Varity_R		0.73
gMVP		0.79

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr3-37092097;