rs63750948

chr3-37014493-T-Achr3-37014493-T-Cchr3-37014493-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 6P and 1B. PM1 PM2 PM5 BP4

The NM_000249.4(MLH1):c.739T>A(p.Ser247Thr) variant causes a missense change. The variant allele was found at a frequency of 0.000000685 in 1,459,732 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts 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. S247P) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: MLH1 NM_000249.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.80

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 Uncertain_significance. Variant got 5 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 17 uncertain in NM_000249.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr3-37014493-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 90342.Status of the report is reviewed_by_expert_panel, 3 stars.
• BP4: Computational evidence support a benign effect (MetaRNN=0.40100315).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MLH1	NM_000249.4	c.739T>A	p.Ser247Thr	missense_variant	9/19	ENST00000231790.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MLH1	ENST00000231790.8	c.739T>A	p.Ser247Thr	missense_variant	9/19	1	NM_000249.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459732 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 726310

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.01e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.074
BayesDel_addAF	Uncertain	0.14	D
BayesDel_noAF	Uncertain	-0.040
Cadd	Benign	21
Dann	Benign	0.92
DEOGEN2	Benign	0.42	T;.;.;.;.;.;.
Eigen	Uncertain	0.19
Eigen_PC	Uncertain	0.30
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.93	D;D;.;.;.;D;D
M_CAP	Benign	0.034	D
MetaRNN	Benign	0.40	T;T;T;T;T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.57	N;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	0.14	N;N;N;N;N;N;N
REVEL	Uncertain	0.47
Sift	Benign	0.87	T;T;T;T;T;T;T
Sift4G	Benign	1.0	T;T;T;T;T;T;T
Polyphen		0.046	B;.;.;.;.;.;.
Vest4		0.41
MutPred		0.71		Gain of sheet (P = 0.1208);.;.;.;.;.;.;
MVP		0.91
MPC		0.071
ClinPred		0.54	D
GERP RS		5.7
Varity_R		0.26
gMVP		0.71

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: chr3-37055984;