About TSC1
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 likely benign. Select a step to read what it means.
Likely benign.A likely benign 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.
No pathogenic criterion marked as applied in the recorded assessment.
The variant is present in gnomAD v2.1 at AF 0.387% (1093/282512 alleles, 7 homozygotes) and gnomAD v4.1 at AF 0.360% (5806/1612416 alleles, 28 homozygotes). Both overall frequencies exceed the 0.3% BS1 threshold. The presence of 7–28 apparently healthy homozygous individuals in population databases for an autosomal dominant tumor suppressor gene (TSC1) provides strong evidence that this variant is benign. PMID:19918125 independently reported the allele at 0.5% in the normal population and concluded it 'cannot be sufficient to cause TSC or FCD.'
Multiple in silico predictors consistently indicate a benign impact. REVEL score is 0.338 (below the 0.5 threshold for pathogenic prediction), BayesDel score is -0.064 (negative, favoring benign), and SpliceAI max delta is 0.09 (below the 0.2 threshold for splicing impact). All three orthogonal computational tools agree on a benign/non-damaging prediction.
This variant is classified as Benign in ClinVar by 23 clinical laboratories and as Likely benign by 4 clinical laboratories (ClinVar Variation ID: 5103). The review status is 'criteria provided, single submitter.' The strong clinical consensus — 23 out of 27 classified submissions are 'Benign' — supports a benign interpretation under BP6.
gene-specific framework lacked a usable explicit final combination framework, so generic ACMG/AMP 2015 final-combination rules were applied as fallback; applied criteria: BS1 strong, BP4 supporting benign, BP6 supporting benign; combination = 1 strong benign + 2 supporting benign, which maps to Likely Benign.
Evidence summaries and captured source records, where available. Missing entries should not be interpreted as negative findings.
gnomAD v4.1: 5,806 / 1,612,416 alleles. Recorded AF 0.00360081. Recorded homozygote count 28.
This variant is present in gnomAD v2.1 (AF= 0.00386886; MAF= 0.38689%, 1093/282512 alleles, homozygotes = 7) and has highest observed frequency in the European (Finnish) population (AF= 0.0138159; MAF= 1.38159%, 347/25116 alleles, homozygotes = 3); grpmax FAF= 0.00616893.
This variant is present in gnomAD-Canada v1.0 (AF= 0.002062975027144408, 38/18420 alleles, homozygotes = 0).
Recorded SpliceAI maximum delta score: 0.090. Refer to the recorded PP3/BP4 rationale for interpretation.
23 Benign · 4 Likely benign.
OncoKB did not identify variant-specific reviewed functional evidence for this variant; gene-level curated context is available for reviewer follow-up. TSC1, a scaffold protein, is frequently altered by mutation in bladder cancer.
This variant has previously been reported in somatic cancers (COSMIC; COSV104404438, n = 6 times).
This variant does not lie in a statistically significant hotspot.
ACMG/AMP criteria under Not recorded, with the data and sources behind each one.
27 criteria with recorded statuses: 3 met · 11 not met · 7 not assessed · 6 not applicable. Open any row for the full reasoning, the rule and the evidence behind it.
NM_000368.5:c.2194C>T (p.His732Tyr) is a missense variant in TSC1, a gene in which loss-of-function variants cause tuberous sclerosis complex (autosomal dominant).
The variant is present in gnomAD v2.1 at an allele frequency of 0.387% (1093/282512 alleles) with 7 homozygotes, and in gnomAD v4.1 at 0.360% (5806/1612416 alleles) with 28 homozygotes. This frequency exceeds the 0.3% threshold for BS1 (strong benign).
The presence of 28 homozygous individuals in gnomAD v4.1 is incompatible with a highly penetrant autosomal dominant tumor suppressor disorder; homozygous loss of TSC1 function would be expected to cause severe disease.
Multiple in silico predictors support a benign interpretation: REVEL score 0.338 (below 0.5 pathogenic threshold), BayesDel score -0.064 (negative score), and SpliceAI max delta 0.09 (below 0.2 splicing threshold), meeting BP4 (supporting benign).
In ClinVar, 23 clinical laboratories classify this variant as Benign and 4 as Likely benign (Variation ID: 5103), meeting BP6 (supporting benign).
PMID:19918125 (Lugnier et al. 2009) characterized hamartin H732Y in vitro and demonstrated reduced tuberin binding (2.3-fold, p<0.05) and aberrant nuclear localization. However, the paper explicitly reported the allele at 0.5% frequency in the normal population and concluded it 'cannot be sufficient to cause TSC or FCD,' describing it as a low-penetrance predisposing variant at most.
Applying generic ACMG/AMP 2015 combination rules (PMID:25741868): one strong benign criterion (BS1) plus two supporting benign criteria (BP4, BP6) yields a final classification of Likely Benign.
No criteria match.
No further detail was recorded.
No further detail was recorded.
No further detail was recorded.
No further detail was recorded.
No further detail was recorded.
Every interpreted variant in TSC1, mapped onto the exon structure of NM_000368.5. Select a row to find it on the plot.
| Protein | Location | Classification | Link |
|---|
| European (Finnish)896 / 64,030 | 0.01411 hom |
| European (non-Finnish)4619 / 1,179,952 | 0.003916 hom |
| Remaining individuals183 / 62,348 | 0.00291 hom |
| Admixed American66 / 60,028 | 0.0011 |
| African/African American40 / 74,996 | 0.00053 |
| Ashkenazi Jewish1 / 29,604 | 3.4e-05 |
| South Asian1 / 91,000 | 1.1e-05 |
| European (Finnish)347 / 25,116 | 0.0143 hom |
| European (non-Finnish)650 / 128,862 | 0.0054 hom |
| Remaining individuals32 / 7,210 | 0.0044 |
| Admixed American43 / 35,436 | 0.0012 |
| African/African American21 / 24,964 | 0.00084 |
This variant is present in gnomAD v4.1 (AF= 0.00360081; MAF= 0.36008%, 5806/1612416 alleles, homozygotes = 28) and has highest observed frequency in the European (Finnish) population (AF= 0.0139934; MAF= 1.39934%, 896/64030 alleles, homozygotes = 11); grpmax FAF= 0.00382016.
This variant is present in gnomAD v2.1 (AF= 0.00386886; MAF= 0.38689%, 1093/282512 alleles, homozygotes = 7) and has highest observed frequency in the European (Finnish) population (AF= 0.0138159; MAF= 1.38159%, 347/25116 alleles, homozygotes = 3); grpmax FAF= 0.00616893.
This variant is present in gnomAD-Canada v1.0 (AF= 0.002062975027144408, 38/18420 alleles, homozygotes = 0).
No further detail was recorded.
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.09). REVEL score = 0.338. BayesDel score = -0.0641334.
10 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= 0.00360081; MAF= 0.36008%, 5806/1612416 alleles, homozygotes = 28) and has highest observed frequency in the European (Finnish) population (AF= 0.0139934; MAF= 1.39934%, 896/64030 alleles, homozygotes = 11); grpmax FAF= 0.00382016.
This variant is present in gnomAD v2.1 (AF= 0.00386886; MAF= 0.38689%, 1093/282512 alleles, homozygotes = 7) and has highest observed frequency in the European (Finnish) population (AF= 0.0138159; MAF= 1.38159%, 347/25116 alleles, homozygotes = 3); grpmax FAF= 0.00616893.
This variant is present in gnomAD-Canada v1.0 (AF= 0.002062975027144408, 38/18420 alleles, homozygotes = 0).
This variant has been reported in ClinVar as Benign (23 clinical laboratories) and as Likely benign (4 clinical laboratories). (ClinVarID = 5103)
SpliceAI predicts no significant splice impact for this variant (max delta score = 0.09). REVEL score = 0.338. BayesDel score = -0.0641334.
OncoKB did not identify variant-specific reviewed functional evidence for this variant; gene-level curated context is available for reviewer follow-up. TSC1, a scaffold protein, is frequently altered by mutation in bladder cancer.
This variant does not lie in a statistically significant hotspot. This variant has previously been reported in somatic cancers (COSMIC; COSV104404438, n = 6 times).
This variant does not lie in a statistically significant hotspot.