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← Primer database

Primer database

Il1b

interleukin 1 beta

Rattus norvegicus

PublicationXing et al. 2022 (Oxid Med Cell Longev)⇄ Compare with 3 other candidates →

Sequences

Forward (5′→3′)

CACCTCTCAAGCAGAGCACAG

Reverse (5′→3′)

GGGTTCCATGGTGAAGTCAAC

Amplicon

79 bp

estimated from mapping

Primer Tm (°C)

ConditionsForwardReverseAverageΔ F/R
qPCR master mix64.562.663.61.9
Primer-BLAST default60.959.160.01.8

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

57.1%

GC% · Reverse

52.4%

Self-dimer ΔG · Fwd (any position)

-1.9 kcal/mol

Self-dimer ΔG · Fwd (3′ end)

0.7 kcal/mol

Self-dimer ΔG · Rev (any position)

-5.5 kcal/mol

Self-dimer ΔG · Rev (3′ end)

-0.5 kcal/mol

Heterodimer ΔG (F×R, any position)

-2.8 kcal/mol

Heterodimer ΔG (F×R, 3′ end)

No duplex found

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

36600948(Europe PMC)

Citation

Xing et al. 2022 (Oxid Med Cell Longev)

Genomic mapping

Ensembl gene

ENSRNOG00000004649 ↗

NCBI Gene ID

24494

Assembly

GRCr8

Cross-check

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

Showing: ENSRNOT00000006308 ★

61bp1771bp62bp2639bp49bp31.8kb202bp4887bp168bp51.4kb131bp61.5kb656bp7FRPredicted 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.79 bp amplicon · predicted amplicon Tm 84.2 °C
Il1b · ENSRNOT00000006308 (NM_031512) · canonical⚠ 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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