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NM_001040108.2:c.3488G>A
p.Gly1163Asp · MLH3
ACMG/AMP
0%
complete
Final classification
Benign
BA1BS1BP4
MLH3
c.3488G>A
p.Gly1163Asp
This variant

The MLH3 c.3488G>A (p.Gly1163Asp; p.G1163D) variant has been reported in ClinVar, where most submissions classify it as benign (6 laboratories) and a minority classify it as uncertain significance (2 laboratories).

Transcript
NM_001040108.2
HGVS · transcript:coding
NM_001040108.2:c.3488G>A
GRCh38
chr14:75039993 C>T
GRCh37
chr14:75506696 C>T
gene-specific framework lacked a usable explicit final combination framework, so generic ACMG/AMP 2015 final-combination rules were applied as fallback; applied criteria: BA1 stand-alone benign, BS1 strong, BP4 supporting; combination = 1 stand-alone benign + 1 strong benign + 1 supporting benign, which maps to Benign.
Classification rationale
BA1BS1BP4 Benign
MLH3 c.3488G>A

The MLH3 c.3488G>A (p.Gly1163Asp; p.G1163D) variant has been reported in ClinVar, where most submissions classify it as benign (6 laboratories) and a minority classify it as uncertain significance (2 laboratories).1 This variant is common in population databases, with East Asian allele frequencies of 2.83720% in gnomAD v2.1 and 2.24070% in gnomAD v4.1, exceeding the default BA1 threshold of 1% and BS1 threshold of 0.3%.2 Computational evidence argues against a deleterious effect: SpliceAI predicts no significant splice impact with a max delta score of 0.00, REVEL is 0.113, and BayesDel is -0.258625.3

BA1 + BS1 + BP4 Benign
LYFE Sciences is an AI system, and it can make mistakes. Criteria may be applied incorrectly, sources may be misread, and a confident-looking classification can still be wrong. Double-check every criterion and its underlying evidence before relying on any call.
Gene diagram · NM_001040108.2 · variants mapped to exon structure
MLH3 NM_001040108.2
Fetching transcript structure from UCSC…
Applied criteria · 3 applied · 23 assessed
MetEvidence satisfies this criterion.
Not metEvaluated against available evidence; threshold not reached.
Not assessedApplies in principle, but no evidence was found to evaluate it.
N/ADoesn't apply to this variant type.
Applied · 3
Strength Supporting Moderate Strong Very strong
BA1 stand-alone Benign
This variant exceeds the default BA1 population threshold of 1%. The highest observed population frequency is 2.83720% in East Asian individuals in gnomAD v2.1 and 2.24070% in East Asian individuals in gnomAD v4.1, both above 1%.
gnomAD v2.1 East Asian AF 0.028372 (565/19914)3 homozygotes.gnomAD v4.1 East Asian AF 0.022407 (989/44138)
BS1 strong Benign
This variant exceeds the default BS1 population threshold of 0.3%. The highest observed population frequency is 2.83720% in East Asian individuals in gnomAD v2.1 and 2.24070% in East Asian individuals in gnomAD v4.1, both well above 0.3%.
gnomAD v2.1 East Asian AF 0.028372.gnomAD v4.1 East Asian AF 0.022407.
BP4 supporting Benign
Multiple computational results support a benign interpretation. SpliceAI shows no significant splice effect with a max delta score of 0.00, REVEL is low at 0.113, and BayesDel is negative at -0.258625, together arguing against a deleterious protein or splice effect.
SpliceAI max delta score 0.00.REVEL score 0.113.BayesDel score -0.258625.
Assessed · not applied · 11 not met · 12 not assessed
Pathogenic
PVS1 This variant is a missense substitution, p.(Gly1163Asp), and does not fall into the generic PVS1 null-variant categories of nonsense, frameshift, or canonical +/-1,2 splice variants.
PS1 No evidence was identified that this exact amino acid change, p.(Gly1163Asp), is caused by a different nucleotide change already established as pathogenic.
PS2 No confirmed de novo occurrence with verified maternity and paternity was identified for this variant.
PS3 No well-established functional study of this exact variant was identified, so pathogenic functional evidence could not be assessed.
PS4 Available evidence does not show enrichment of this variant in affected individuals compared with controls.
PM1 This variant does not have evidence of occurring in a well-established mutational hotspot or a clearly defined critical functional domain without benign variation.
PM2 This variant is not absent or rare in population databases.
PM3 No evidence was identified showing this variant in trans with a pathogenic variant in a recessive disease setting.
PM5 No evidence was identified that a different missense change at codon 1163 is already established as pathogenic.
PM6 No presumed de novo occurrence of this variant without confirmed parentage was identified.
PP1 No segregation data were identified for this variant, so co-segregation with disease could not be assessed.
PP2 No gene-specific evidence was identified showing that pathogenic missense variation is a common mechanism in MLH3 and that benign missense variation is uncommon, so PP2 was not assessed.
PP3 Available computational evidence does not support a deleterious effect.
PP4 No highly specific phenotype, family history, or tumor profile attributable to this exact variant was identified, so PP4 could not be assessed.
PP5 A pathogenic assertion from a reputable source without accessible supporting evidence was not identified for this variant.
Benign
BS2 Although homozygotes are present in gnomAD, the disease-specific penetrance and inheritance context needed to apply BS2 were not established here, so BS2 was not assessed.
BS3 No well-established functional study showing normal or near-normal function for this exact variant was identified, so benign functional evidence could not be assessed.
BS4 No non-segregation data were identified for this variant, so BS4 could not be assessed.
BP1 This is a missense variant, but there was not enough gene-specific evidence to conclude that pathogenic variation in MLH3 is predominantly truncating with missense changes generally benign, so BP1 was not assessed.
BP2 No data were identified showing this variant in trans with a pathogenic variant for a dominant disorder or in cis with a pathogenic variant, so BP2 could not be assessed.
BP3 This criterion is intended for in-frame indels in repetitive regions, and no relevant evidence was identified for this missense variant.
BP5 No evidence was identified for an alternate molecular basis explaining the observed phenotype independent of this variant, so BP5 could not be assessed.
BP6 A benign assertion from a reputable source without accessible supporting evidence was not used here because ClinVar submissions are mixed, with benign and uncertain significance classifications present rather than a single clear benign assertion.
N/A · 2 PM4 · BP7
Research & evidence
Population frequency · supports benign
gnomAD v4.1 screenshot
gnomAD v4.1
gnomAD v2.1 screenshot
gnomAD v2.1
v4.1
This variant is present in gnomAD v4.1 (AF= 0.000720685; MAF= 0.07207%, 1147/1591542 alleles, homozygotes = 9) and has highest observed frequency in the East Asian population (AF= 0.022407; MAF= 2.24070%, 989/44138 alleles, homozygotes = 7); grpmax FAF= 0.0212477.
v2.1
This variant is present in gnomAD v2.1 (AF= 0.00212908; MAF= 0.21291%, 600/281812 alleles, homozygotes = 3) and has highest observed frequency in the East Asian population (AF= 0.028372; MAF= 2.83720%, 565/19914 alleles, homozygotes = 3); grpmax FAF= 0.0263843.
Allele frequency by ancestry
three datasets · side by side
gnomAD v4.1
0.072% · 1147 / 1,591,542
9 hom · FAF 2.1%
East Asian
989 / 44,138
2.2%
7 hom
Remaining individuals
84 / 61,558
0.14%
2 hom
African/African American
38 / 74,270
0.051%
Admixed American
23 / 59,712
0.039%
South Asian
5 / 90,666
0.0055%
European (Finnish)
1 / 62,856
0.0016%
European (non-Finnish)
7 / 1,162,110
0.0006%
+ 3 not observed (Amish, Middle Eastern, Ashkenazi Jewish)
gnomAD v2.1
0.21% · 600 / 281,812
3 hom · FAF 2.6%
East Asian
565 / 19,914
2.8%
3 hom
Remaining individuals
7 / 7,180
0.097%
African/African American
19 / 24,850
0.076%
Admixed American
6 / 35,376
0.017%
South Asian
2 / 30,612
0.0065%
European (non-Finnish)
1 / 128,946
0.00078%
+ 2 not observed (Ashkenazi Jewish, European (Finnish))
ClinVar screenshot
ClinVar
This variant has been reported in ClinVar as Benign (6 clinical laboratories) and as Uncertain significance (2 clinical laboratories).
SpliceAI screenshot
In silico
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). REVEL score = 0.113. BayesDel score = -0.258625.
Functional / OncoKB screenshot
Functional Unknown Oncogenic Effect
OncoKB did not identify variant-specific reviewed functional evidence for this variant; gene-level curated context is available for reviewer follow-up. MLH3, a DNA mismatch repair protein, is infrequently altered in cancer.
OncoKB ↗
COSMIC screenshot
COSMIC
Cancer hotspots screenshot
Cancer hotspots
Somatic evidence Not in COSMIC / hotspots
COSMIC
This variant does not lie in a statistically significant hotspot. This variant has previously been reported in somatic cancers (COSMIC; COSV105867929, n = 2 times).
Hotspots
This variant does not lie in a statistically significant hotspot.
Sources & reference links
7Sources
ClinVar
gnomAD v2.1
gnomAD v4.1
SpliceAI
OncoKB
COSMIC
Cancer hotspots