rs1553340884
Positions:
Variant summary
Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PM4_SupportingPP5
The NM_000143.4(FH):c.1117_1119del(p.Asn373del) variant causes a inframe deletion change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. N373N) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 32)
Consequence
FH
NM_000143.4 inframe_deletion
NM_000143.4 inframe_deletion
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 7.48
Genes affected
FH (HGNC:3700): (fumarate hydratase) The protein encoded by this gene is an enzymatic component of the tricarboxylic acid (TCA) cycle, or Krebs cycle, and catalyzes the formation of L-malate from fumarate. It exists in both a cytosolic form and an N-terminal extended form, differing only in the translation start site used. The N-terminal extended form is targeted to the mitochondrion, where the removal of the extension generates the same form as in the cytoplasm. It is similar to some thermostable class II fumarases and functions as a homotetramer. Mutations in this gene can cause fumarase deficiency and lead to progressive encephalopathy. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 6 ACMG points.
PM1
?
In a hotspot region, there are 10 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 5 uncertain in NM_000143.4
PM2
?
Very rare variant in population databases, with high coverage;
PM4
?
Nonframeshift variant in NON repetitive region in NM_000143.4. Strenght limited to Supporting due to length of the change: 1aa.
PP5
?
Variant 1-241502559-GGTT-G is Pathogenic according to our data. Variant chr1-241502559-GGTT-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 460336.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
FH | NM_000143.4 | c.1117_1119del | p.Asn373del | inframe_deletion | 8/10 | ENST00000366560.4 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
FH | ENST00000366560.4 | c.1117_1119del | p.Asn373del | inframe_deletion | 8/10 | 1 | NM_000143.4 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
We have no GnomAD4 exomes data on this position. Probably position not covered by the project.
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:1Uncertain:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Hereditary cancer-predisposing syndrome Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Sep 20, 2023 | The c.1117_1119delAAC variant (also known as p.N373del) is located in coding exon 8 of the FH gene. This variant results from an in-frame AAC deletion at nucleotide positions 1117 to 1119. This results in the in-frame deletion of an asparagine at codon 373. This alteration has been observed in at least one individual with a personal and/or family history that is consistent with HLRCC-related disease (Ambry internal data). This amino acid position is highly conserved in available vertebrate species and the impacted region is critical for protein function (Ambry internal data). Based on internal structural analysis, N373del is deleterious and disrupts the active site of the protein (Ajalla Aleixo MA et al. FEBS J, 2019 May;286:1925-1940; Hicks KG et al. Science, 2023 Mar;379:996-1003). In addition, this alteration is predicted to be deleterious by in silico analysis (Choi Y et al. PLoS ONE. 2012; 7(10):e46688). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). As such, this alteration is classified as likely pathogenic. - |
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Aug 17, 2019 | This sequence change deletes 3 nucleotides from exon 8 of the FH mRNA (c.1117_1119delAAC). This leads to the deletion of 1 amino acid residue in the FH protein (p.Asn373del) but otherwise preserves the integrity of the reading frame. In summary, this is a novel in-frame deletion with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Experimental studies and prediction algorithms are not available for this variant, and the functional significance of the deleted amino acid is currently unknown. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a FH-related disease. - |
Computational scores
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Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at