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← Primer database

Primer database

CTSL

cathepsin L

Homo sapiens

PublicationSun et al. 2024

Sequences

Forward (5′→3′)

CACCGGCTTTGTGGACATC

Reverse (5′→3′)

ATGACCTGCATCAATAGCAACA

Amplicon

94 bp

estimated from mapping

Primer Tm (°C)

ConditionsForwardReverseAverageΔ F/R
qPCR master mix62.961.462.21.5
Primer-BLAST default59.158.458.80.7

qPCR master mix: Owczarzy 2004/2008 · 250 nM primer · 50 mM Na⁺ · 3 mM Mg²⁺ · 0.8 mM dNTP

Primer-BLAST default: SantaLucia 1998 salt corr. · 50 nM primer · 50 mM Na⁺ · 1.5 mM Mg²⁺ · 0.6 mM dNTP

Bold, underlined base = 3′ end (polymerase extension point).

Primer QC

GC% · Forward

57.9%

GC% · Reverse

40.9%

Self-dimer ΔG · Fwd (any position)

-3.9 kcal/mol

Self-dimer ΔG · Fwd (3′ end)

0.7 kcal/mol

Self-dimer ΔG · Rev (any position)

-3.1 kcal/mol

Self-dimer ΔG · Rev (3′ end)

0.5 kcal/mol

Heterodimer ΔG (F×R, any position)

-1.5 kcal/mol

Heterodimer ΔG (F×R, 3′ end)

-0.9 kcal/mol

ΔG at 37 °C · SantaLucia 1998 NN parameters · < −6 kcal/mol = significant dimer risk · "3′ end" is restricted to duplexes anchored at a primer's own 3′ terminal base (polymerase-extendable); "any position" is the most stable duplex anywhere in the primer. Estimated screening value. For comprehensive dimer analysis, validate with Primer3.

Source

PMID

40226717(Europe PMC)

Citation

Sun et al. 2024

Genomic mapping

Ensembl gene

ENSG00000135047 ↗

NCBI Gene ID

1514

Assembly

GRCh38

Cross-check

✓ENST00000678442
✓ENST00000679149
✓ENST00000679157
✓ENST00000676946
✓ENST00000676531
✓ENST00000677821
✓ENST00000677019
✓ENST00000678649
✓ENST00000342020
✓ENST00000677262
✓ENST00000343150★
✓ENST00000677864
✓ENST00000340342
✓ENST00000676881
✓ENST00000676769
✓ENST00000678596
✓ENST00000679030
✓ENST00000678599
✓ENST00000677761
✓ENST00000676480
✓ENST00000882604
✓ENST00000882605
ENST00000882606
✓ENST00000882607
✓ENST00000882608
✓ENST00000882609
✓ENST00000882610
✓ENST00000882611
✓ENST00000882612
✓ENST00000882613
ENST00000882614
✓ENST00000882615
✓ENST00000915605
✓ENST00000915606
✓ENST00000941021
✓ENST00000941022
✓ENST00000941023
✓ENST00000941024
✓ENST00000999099
✓ENST00000999101
✓ENST00001022876
ENST00001092743
✓ENST00001092744
ENST00001129899
✓ENST00001139120
194bp1.3kb~2.2kbThis is the outer span across every isoform's exon here. They don't all agree on the exact boundary (alternative splice site), so hover a row's own box below for its real length.158bp~192bpThis is the outer span across every isoform's exon here. They don't all agree on the exact boundary (alternative splice site), so hover a row's own box below for its real length.100bp147bp188bp~225bpThis is the outer span across every isoform's exon here. They don't all agree on the exact boundary (alternative splice site), so hover a row's own box below for its real length.763bp~163bpThis is the outer span across every isoform's exon here. They don't all agree on the exact boundary (alternative splice site), so hover a row's own box below for its real length.645bp~1.1kbThis is the outer span across every isoform's exon here. They don't all agree on the exact boundary (alternative splice site), so hover a row's own box below for its real length.
exon presentprimer binds hereconfirmed amplicongap = exon skipped~bp = boundary varies
How do I read this diagram?

Each row is one transcript, aligned on a shared axis. A gap means that isoform skips this exonic region. Each row's box is drawn at that isoform's own real exon length, which can be narrower than the column (alternative splice site); hover a box for its exact size. A ~amber header bp means isoforms don't all agree on this region's boundary, while a plain header means they do. Navy blocks mark where the primers bind, and green (with a ✓ by the name) means this isoform has a confirmed working amplicon, not just exon overlap. A row with a “‹ exons” / “exons ›” hint instead of any box means that isoform's exons exist but sit outside the current scroll position (a truncated isoform or alternate transcription start site) — click the hint to jump to them. Click a row to load it below.

★ = Ensembl canonical transcript (reference model, not necessarily the most expressed isoform)

Showing: ENST00000678442

194bp13.3kb136bp2297bp123bp3100bp147bp4188bp225bp5763bp163bp6645bp118bp7509bp462bp8FRPredicted from the amplicon's own GC%+length (von Ahsen et al. 2001, at the same qPCR buffer as the primer Tm above: 50 mM Na⁺ plus 3 mM Mg²⁺ less 0.8 mM dNTP, as a sodium equivalent), not the SantaLucia model used for primer Tm, which isn't valid at this length. A screening estimate for ranking amplicons — that relation was fitted on oligonucleotide duplexes, so applying it at amplicon length carries more error than its published ±1.9 °C, and it is not a melt-peak prediction.94 bp amplicon · predicted amplicon Tm 85.8 °C
CTSL · ENST00000678442⚠ Single-exon · may amplify genomic DNA

Off-target specificity

Specific

No paired forward+reverse off-target amplicon found against nt (whole genome/transcriptome). Screen requires >=2 total mismatches including >=2 within the last 5bp at the 3' end to clear a hit (NCBI Primer-BLAST-style stringency); hits with >=6 total mismatches are dropped as implausible.

Efficiency measurements

Ideal range:Dilution series 1.90–2.10·LinRegPCR 1.70–1.90·unknown method: not scored
No measurements yet for this primer pair.

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