MitoAge

Ursus americanus

American black bear

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Maximum lifespan
34 yr
AnAge record
mtDNA size
16,841 bp
RefSeq NC_003426.1
GC content
40.60%
Whole genome
Non-coding
1,456 bp
Including the D-loop

Where American black bear sits among 2,335 species

Whole-genome GC content against maximum lifespan. American black bear has the 346th longest lifespan of them.

10203040501 yr10 yr100 yrMaximum lifespan, log scaleGC %American black bear
  • This species
  • Other mammals
  • Other classes
Plot other mtDNA features with this species highlighted

Base composition

Whole genome16,841 bp
GC skew (G − C) / (G + C)
−0.235
AT skew (A − T) / (A + T)
+0.048

Life history

Maximum lifespan
34 years
Adult weight
154.3 kg
Birth weight
277.5 g
Female sexual maturity
3.5 years
Male sexual maturity
3.5 years
Gestation or incubation
70 days
Litter or clutch size
2
Litters per year
0.4
Postnatal growth rate
0.0029 per day

Lifespan from AnAge · AnAge record · other traits from AnAge Build 15 (HAGRID 02251)

About this record

Lifespan source
AnAge build 15
Based on
an animal in captivity
Data quality
acceptable, large sample
Licence
Free to use, subject to the Human Ageing Genomic Resources conditions of use
Status
Updated in build 2
In the database since
build 1 (2015-07-01)
Last changed
build 2 (2026-11-13)

Every change against the 2015 build is in the changelog download.

Composition by region

Reference (L) strand as deposited in RefSeq
Whole genome16,841 bp
Protein-coding11,341 bp
12S rRNA965 bp
16S rRNA1,580 bp
All tRNA1,507 bp

Genes and regions

Select a column to sort; select a gene to compare it across species
Composition
ND1NADH dehydrogenase subunit 1957 bp29.6%28.2%13.5%28.7%42.22%−0.361+0.024
ND2NADH dehydrogenase subunit 21,044 bp33.5%27.5%10.9%28.1%38.99%−0.440+0.099
COX1Cytochrome c oxidase subunit I1,545 bp26.5%31.8%18.8%22.8%41.62%−0.098−0.091
COX2Cytochrome c oxidase subunit II684 bp33.2%26.9%15.4%24.6%39.91%−0.231+0.105
ATP8ATP synthase F0 subunit 8204 bp38.2%27.0%9.3%25.5%34.80%−0.465+0.173
ATP6ATP synthase F0 subunit 6681 bp27.8%30.4%14.2%27.6%41.85%−0.319−0.045
COX3Cytochrome c oxidase subunit III784 bp26.5%30.4%16.8%26.3%43.11%−0.219−0.067
ND3NADH dehydrogenase subunit 3346 bp28.0%29.5%14.7%27.7%42.49%−0.306−0.025
ND4LNADH dehydrogenase subunit 4L297 bp27.3%34.0%14.5%24.2%38.72%−0.252−0.110
ND4NADH dehydrogenase subunit 41,378 bp30.3%27.7%13.1%29.0%42.02%−0.378+0.044
ND5NADH dehydrogenase subunit 51,821 bp31.9%29.9%12.4%25.9%38.28%−0.354+0.032
ND6NADH dehydrogenase subunit 6528 bp40.3%20.6%11.2%27.8%39.02%−0.427+0.323
CYTBCytochrome b1,140 bp28.9%27.2%14.2%29.6%43.86%−0.352+0.031
12S rRNA12S ribosomal RNA965 bp34.7%23.2%19.4%22.7%42.07%−0.079+0.199
16S rRNA16S ribosomal RNA1,580 bp36.0%24.8%18.4%20.8%39.18%−0.063+0.184

Codon usage

Counts per codon, darker is more frequent

3,802 codons in all protein-coding genes. Grouped with the Vertebrate mitochondrial code (NCBI table 2).

Phe F6.3%
UUU117
UUC121
Leu L15.6%
UUA83
UUG23
CUU83
CUC79
CUA265
CUG61
Ile I8.3%
AUU167
AUC149
Met M6.4%
AUA164
AUG78
Val V5.3%
GUU35
GUC53
GUA84
GUG30
Ser S7.4%
UCU70
UCC52
UCA91
UCG8
AGU26
AGC34
Pro P5.3%
CCU57
CCC68
CCA69
CCG6
Thr T7.9%
ACU82
ACC71
ACA127
ACG20
Ala A7.2%
GCU56
GCC106
GCA99
GCG13
Tyr Y3.5%
UAU72
UAC62
His H2.6%
CAU41
CAC56
Gln Q2.4%
CAA75
CAG15
Asn N3.8%
AAU66
AAC79
Lys K2.7%
AAA86
AAG15
Asp D1.8%
GAU37
GAC31
Glu E2.6%
GAA68
GAG30
Cys C0.6%
UGU9
UGC15
Trp W2.7%
UGA92
UGG12
Arg R1.7%
CGU7
CGC8
CGA44
CGG6
Gly G5.8%
GGU29
GGC52
GGA96
GGG42
Stop 0.3%
UAA8
UAG1
AGA1
AGG0

Genome map

37 annotated features in NC_003426.1

Hover, tap or tab to a feature to see its position, length, strand and GC content. Genes and rRNAs open their own pages.

  • Protein-coding13
  • rRNA2
  • tRNA22
  • Outer ring: + strand, arrows run clockwise. Inner ring: − strand.
  • Middle ring: GC% of each gene against the whole genome (40.6%, dashed): out is GC-richer, in is AT-richer (full height = 6 points).
All 37 features as a table
FeatureTypeStartEndLengthStrandGC
tRNA-PheTransfer RNA9431,01068 bp+–
12S rRNARibosomal RNA1,0111,975965 bp+42.1%
tRNA-ValTransfer RNA1,9762,04166 bp+–
16S rRNARibosomal RNA2,0423,6211,580 bp+39.2%
tRNA-Leu (UUR)Transfer RNA3,6233,69775 bp+–
ND1Protein-coding gene3,7004,656957 bp+42.2%
tRNA-IleTransfer RNA4,6554,72470 bp+–
tRNA-GlnTransfer RNA4,7224,79473 bp−–
tRNA-MetTransfer RNA4,7964,86368 bp+–
ND2Protein-coding gene4,8645,9071,044 bp+39.0%
tRNA-TrpTransfer RNA5,9065,97267 bp+–
tRNA-AlaTransfer RNA5,9816,04969 bp−–
tRNA-AsnTransfer RNA6,0506,12273 bp−–
tRNA-CysTransfer RNA6,1566,22267 bp−–
tRNA-TyrTransfer RNA6,2226,28968 bp−–
COX1Protein-coding gene6,2917,8351,545 bp+41.6%
tRNA-Ser (UCN)Transfer RNA7,8327,90372 bp−–
tRNA-AspTransfer RNA7,9087,97467 bp+–
COX2Protein-coding gene7,9758,658684 bp+39.9%
tRNA-LysTransfer RNA8,6628,72968 bp+–
ATP8Protein-coding gene8,7328,935204 bp+34.8%
ATP6Protein-coding gene8,8939,573681 bp+41.9%
COX3Protein-coding gene9,57310,356784 bp+43.1%
tRNA-GlyTransfer RNA10,35710,42569 bp+–
ND3Protein-coding gene10,42610,771346 bp+42.5%
tRNA-ArgTransfer RNA10,77310,84169 bp+–
ND4LProtein-coding gene10,84211,138297 bp+38.7%
ND4Protein-coding gene11,13212,5091,378 bp+42.0%
tRNA-HisTransfer RNA12,51012,57869 bp+–
tRNA-Ser (AGY)Transfer RNA12,57912,63759 bp+–
tRNA-Leu (CUN)Transfer RNA12,63812,70770 bp+–
ND5Protein-coding gene12,70814,5281,821 bp+38.3%
ND6Protein-coding gene14,51215,039528 bp−39.0%
tRNA-GluTransfer RNA15,04015,10869 bp−–
CYTBProtein-coding gene15,11316,2521,140 bp+43.9%
tRNA-ThrTransfer RNA16,25316,32270 bp+–
tRNA-ProTransfer RNA16,32316,38765 bp−–

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