About FH
No gene-level summary was recorded for this case.
No variant summary was recorded for this case.
Five-step scale from benign to pathogenic. This variant is pathogenic. Select a step to read what it means.
Pathogenic.A pathogenic classification under the recorded framework.
Gene-level background from the recorded interpretation.
Words with a dotted underline have a short definition. Hover or tap them.No gene-level summary was recorded for this case.
The recorded framework is Not recorded. The criteria and strengths shown below come from the saved assessment; this page does not recalculate the classification.
The applied criteria and their strengths are shown as assessed under the stated framework.
Null variant (nonsense) in gene FH where loss of function is a known mechanism of disease for hereditary leiomyomatosis and renal cell cancer (HLRCC). The variant introduces a premature termination codon at position 101 of 511 amino acids in exon 3 of 10, predicted to trigger nonsense-mediated decay. FH is an established tumor suppressor with autosomal dominant HLRCC predisposition; truncating germline FH variants are a well-characterized cause of this syndrome. Per ClinGen SVI PVS1 recommendations (PMC6185798), a nonsense variant in a gene with established LoF disease mechanism is assigned PVS1 at full strength.
Protein-truncating FH mutations have been demonstrated to be functionally null alleles. PMID:12761039 states that 'Protein-truncating FH mutations are functionally null alleles,' and multiple studies (PMID:16597677, PMID:21398687) have demonstrated significantly reduced FH enzymatic activity in cells from HLRCC patients harboring various FH mutations. OncoKB annotates this variant as 'Likely Loss-of-function.' While no full-text publication specifically assaying the R101* variant was identified, the functional null effect of nonsense variants in FH is well-established across the literature. The strength is downgraded to supporting because the evidence is derived from class-level functional characterization rather than a variant-specific assay.
The variant is absent from gnomAD v2.1 and gnomAD-Canada v1.0, and is present at extremely low frequency in gnomAD v4.1 (12/1,613,900 alleles, global AF = 0.00074%), all observed in the European (non-Finnish) population (12/1,179,948, subpopulation AF = 0.00102%). This frequency is well below the 0.1% threshold for PM2 in non-VCEP assessment. No homozygotes are observed.
Multiple reputable clinical laboratories and curated databases report NM_000143.4:c.301C>T as pathogenic. ClinVar records 14 clinical laboratories classifying this variant as Pathogenic (Variation ID 16232, review status: criteria provided, single submitter). Three major clinical testing laboratories (Ambry Genetics, Invitae/Labcorp, Fulgent Genetics) and OMIM have submitted Pathogenic classifications. OncoKB annotates this variant as Likely Oncogenic with a Likely Loss-of-function biological effect. While the evidence underlying these classifications could not be independently verified, the consensus from multiple reputable sources supports application of PP5.
No benign criterion marked as applied in the recorded assessment.
gene-specific framework lacked a usable explicit final combination framework, so generic ACMG/AMP 2015 final-combination rules were applied as fallback; applied criteria: PVS1 very strong, PS3 supporting, PM2 moderate, PP5 supporting; combination = 1 very strong + 1 moderate + 2 supporting, which maps to Pathogenic.
Evidence summaries and captured source records, where available. Missing entries should not be interpreted as negative findings.
gnomAD v4.1: 12 / 1,613,900 alleles. Recorded AF 7.4354e-06. Recorded homozygote count 0.
Absent from gnomAD v2.1.
Absent from gnomAD-Canada v1.0.
Recorded SpliceAI maximum delta score: 0.000. Refer to the recorded PP3/BP4 rationale for interpretation.
14 Pathogenic.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Likely Loss-of-function; curated oncogenicity label: Likely Oncogenic.
This variant has not previously been reported in somatic cancers (COSMIC).
This variant does not lie in a statistically significant hotspot.
ACMG/AMP criteria under Not recorded, with the data and sources behind each one.
29 criteria with recorded statuses: 4 met · 8 not met · 9 not assessed · 8 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.
NM_000143.4:c.301C>T (p.Arg101Ter) is a nonsense variant in exon 3 of 10 in the FH gene, which encodes fumarate hydratase. Loss-of-function variants in FH are an established cause of autosomal dominant hereditary leiomyomatosis and renal cell cancer (HLRCC).
This variant introduces a premature termination codon at position 101 of 511 amino acids, predicted to trigger nonsense-mediated decay and result in complete loss of protein function. Under ClinGen SVI PVS1 guidelines, this meets criteria for PVS1 at very strong strength.
The variant is absent from gnomAD v2.1 and gnomAD-Canada, and is present at extremely low frequency in gnomAD v4.1 (12/1,613,900 alleles, AF = 0.00074%, no homozygotes), meeting PM2 at moderate strength.
Protein-truncating FH mutations have been demonstrated to be functionally null alleles in published studies, and OncoKB annotates R101* as Likely Loss-of-function, supporting a damaging functional effect at PS3 supporting strength.
This variant has been classified as Pathogenic by 14 clinical laboratories in ClinVar (Variation ID 16232) and is annotated as Likely Oncogenic by OncoKB, meeting PP5 at supporting strength.
No benign criteria are met. The variant is absent or at extremely low frequency in population databases (BA1/BS1 not met), functional evidence supports a damaging effect (BS3 not met), and no reputable source reports this variant as benign (BP6 not met).
Applying the ACMG/AMP 2015 combination rules: 1 Very Strong (PVS1) + 1 Moderate (PM2) + 2 Supporting (PS3, PP5) satisfies the threshold for Pathogenic classification.
No criteria match.
No further detail was recorded.
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Every interpreted variant in FH, mapped onto the exon structure of NM_000143.4. Select a row to find it on the plot.
| Protein | Location | Classification | Link |
|---|
| European (non-Finnish)12 / 1,179,948 | 1e-05 |
This variant is present in gnomAD v4.1 (AF= 7.4354e-06; MAF= 0.00074%, 12/1613900 alleles, homozygotes = 0) and has highest observed frequency in the European (non-Finnish) population (AF= 1.01699e-05; MAF= 0.00102%, 12/1179948 alleles, homozygotes = 0); grpmax FAF= 5.42e-06.
Absent from gnomAD v2.1.
Absent from gnomAD-Canada v1.0.
No further detail was recorded.
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). BayesDel score = 0.486496.
7 paper records listed. No publication is explicitly linked to an applied criterion in the recorded metadata. None of the listed paper records explicitly indicates that the variant is named.
Screenshots represent source records captured during evidence collection. Select one to view the recorded source content.
The evidence statements recorded by the interpretation pipeline. They have not been reinterpreted by the page.
This variant is present in gnomAD v4.1 (AF= 7.4354e-06; MAF= 0.00074%, 12/1613900 alleles, homozygotes = 0) and has highest observed frequency in the European (non-Finnish) population (AF= 1.01699e-05; MAF= 0.00102%, 12/1179948 alleles, homozygotes = 0); grpmax FAF= 5.42e-06.
Absent from gnomAD v2.1.
Absent from gnomAD-Canada v1.0.
This variant has been reported in ClinVar as Pathogenic (14 clinical laboratories). (ClinVarID = 16232)
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.00). BayesDel score = 0.486496.
OncoKB identified variant-specific curated literature and context relevant to functional review; biological-effect context: Likely Loss-of-function; curated oncogenicity label: Likely Oncogenic.
This variant does not lie in a statistically significant hotspot. This variant has not previously been reported in somatic cancers (COSMIC).
This variant does not lie in a statistically significant hotspot.