rs1057516039
Positions:
Variant summary
Our verdict is Pathogenic. Variant got 22 ACMG points: 22P and 0B. PVS1PM2PP3_StrongPP5_Very_Strong
The NM_003482.4(KMT2D):c.14075+1G>A variant causes a splice donor 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. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).
Frequency
Genomes: not found (cov: 32)
Consequence
KMT2D
NM_003482.4 splice_donor
NM_003482.4 splice_donor
Scores
5
1
1
Splicing: ADA: 1.000
2
Clinical Significance
Conservation
PhyloP100: 7.50
Genes affected
KMT2D (HGNC:7133): (lysine methyltransferase 2D) The protein encoded by this gene is a histone methyltransferase that methylates the Lys-4 position of histone H3. The encoded protein is part of a large protein complex called ASCOM, which has been shown to be a transcriptional regulator of the beta-globin and estrogen receptor genes. Mutations in this gene have been shown to be a cause of Kabuki syndrome. [provided by RefSeq, Oct 2010]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 22 ACMG points.
PVS1
?
Splicing variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
PP5
?
Variant 12-49029400-C-T is Pathogenic according to our data. Variant chr12-49029400-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 369674.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
KMT2D | NM_003482.4 | c.14075+1G>A | splice_donor_variant | ENST00000301067.12 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
KMT2D | ENST00000301067.12 | c.14075+1G>A | splice_donor_variant | 5 | NM_003482.4 | A2 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Pathogenic/Likely pathogenic
Submissions summary: Pathogenic:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Kabuki syndrome 1 Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Neuberg Centre For Genomic Medicine, NCGM | - | The splice donor c.14075+1G>A variant in the KMT2D gene has been observed in individual(s) with Kabuki syndrome (Dillon, Oliver James et al., 2018). The variant is absent in gnomAD Exomes. The variant has been submitted to ClinVar databse as Likely Pathogenic/Pathogenic. The variant affects the GT donor splice site downstream of exon 44. Loss of function variants have been previously reported to be disease causing. The spliceAI tool predicts the variant to be damaging. For these reasons, this variant has been classified as Pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Victorian Clinical Genetics Services, Murdoch Childrens Research Institute | Nov 24, 2014 | This substitution is predicted to abolish the donor splice site of exon 43 and may result in premature truncation of the protein. This is a novel variant and is predicted to be deleterious by in-silico models. It was confirmed to be de novo in a child with clinical features of Kabuki syndrome. - |
Kabuki syndrome Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Invitae | Mar 02, 2022 | In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. ClinVar contains an entry for this variant (Variation ID: 369674). Disruption of this splice site has been observed in individual(s) with Kabuki syndrome (PMID: 29453417; Invitae). This variant is not present in population databases (gnomAD no frequency). This sequence change affects a donor splice site in intron 43 of the KMT2D gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in KMT2D are known to be pathogenic (PMID: 22126750). - |
Inborn genetic diseases Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | May 02, 2022 | The c.14075+1G>A intronic variant results from a G to A substitution one nucleotide after coding exon 43 of the KMT2D gene. Alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This alteration was reported in an infant with sensorineural hearing impairment, cleft palate, ventricular septal defect, and partially duplicated displaced kidney (Stark, 2016). This nucleotide position is highly conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will weaken the native splice donor site. Based on the available evidence, this alteration is classified as pathogenic. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
MutationTaster
Benign
D
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Splicing
Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Pathogenic
dbscSNV1_RF
Pathogenic
SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_DL_spliceai
Position offset: 1
Find out detailed SpliceAI scores and Pangolin per-transcript scores at