3-37047688-G-A
Variant summary
Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PP3_Strong
The NM_000249.4(MLH1):c.1896+5G>A variant causes a splice donor 5th base, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000186 in 1,613,706 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).
Frequency
Consequence
NM_000249.4 splice_donor_5th_base, intron
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_pathogenic. Variant got 6 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
MLH1 | NM_000249.4 | c.1896+5G>A | splice_donor_5th_base_variant, intron_variant | ENST00000231790.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
MLH1 | ENST00000231790.8 | c.1896+5G>A | splice_donor_5th_base_variant, intron_variant | 1 | NM_000249.4 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.00000658 AC: 1AN: 152060Hom.: 0 Cov.: 31
GnomAD3 exomes AF: 0.0000119 AC: 3AN: 251376Hom.: 0 AF XY: 0.0000221 AC XY: 3AN XY: 135858
GnomAD4 exome AF: 0.00000137 AC: 2AN: 1461646Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2AN XY: 727150
GnomAD4 genome ? AF: 0.00000658 AC: 1AN: 152060Hom.: 0 Cov.: 31 AF XY: 0.0000135 AC XY: 1AN XY: 74268
ClinVar
Submissions by phenotype
not provided Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Jan 26, 2023 | Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports a deleterious effect on splicing; Published functional studies demonstrate that this variant is suspected to affect splicing (Chen et al., 2019); Observed in an individual with lung and gastric cancer (Chen et al., 2019); This variant is associated with the following publications: (PMID: 33933134, 31207149) - |
Uncertain significance, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | Feb 01, 2019 | - - |
Hereditary cancer-predisposing syndrome Uncertain:2
Uncertain significance, criteria provided, single submitter | clinical testing | Color Diagnostics, LLC DBA Color Health | Nov 09, 2023 | This variant causes a G to A nucleotide substitution at the +5 position of intron 16 of the MLH1 gene. Splice site prediction tools are inconclusive regarding the impact of this variant on RNA splicing. This variant has been reported in an individual affected with gastric and lung cancer and suspected of Lynch syndrome (PMID: 31207149). This variant has also been identified in 3/251376 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. - |
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Dec 21, 2023 | The c.1896+5G>A intronic variant results from a G to A substitution 5 nucleotides after coding exon 16 in the MLH1 gene. This nucleotide position is not well conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will result in the creation or strengthening of a novel splice donor site; however, direct evidence is insufficient at this time (Ambry internal data). Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Muir-Torré syndrome;C1333991:Colorectal cancer, hereditary nonpolyposis, type 2;C5399763:Mismatch repair cancer syndrome 1 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Oct 31, 2018 | - - |
Lynch syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | All of Us Research Program, National Institutes of Health | Dec 13, 2023 | This variant causes a G to A nucleotide substitution at the +5 position of intron 16 of the MLH1 gene. Splice site prediction tools are inconclusive regarding the impact of this variant on RNA splicing. This variant has been reported in an individual affected with gastric and lung cancer and suspected of Lynch syndrome (PMID: 31207149). This variant has also been identified in 3/251376 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. - |
Hereditary nonpolyposis colorectal neoplasms Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Oct 18, 2023 | This sequence change falls in intron 16 of the MLH1 gene. It does not directly change the encoded amino acid sequence of the MLH1 protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs759870594, gnomAD 0.006%). This variant has been observed in individual(s) with gastric and lung cancer (PMID: 31207149). ClinVar contains an entry for this variant (Variation ID: 483545). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at