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Table 1 Summary of preferred codons for each amino acid for 11 species, with differences noted for D. willistoni.

From: Codon usage in twelve species of Drosophila

Amino acid

Optimal codon

D. willistoni

Exceptions/notes

Arg

CGC

CGT

 

Leu

CTG

TTG

 

Ser

TCC

---

Dpse about equal TCC/AGC preference; Dper, and subgenus Drosophila prefers AGC

Thr

ACC

---

10% highest RSCU identifies ACG in Dmoj and Dvir; ACA in Dgri

Pro

CCC

CCA

10% highest RSCU identifies CCG in Dvir

Ala

GCC

---

 

Gly

GGC

GGT

 

Val

GTG

GTG/GTC

 

Lys

AAG

---

 

Asn

AAC

AAT

 

Gln

CAG

---

 

His

CAC

No preference

10% highest RSCU identifies CAT in Dgri

Glu

GAG

---

 

Asp

GAC

GAT

Very weak bias, methods differ somewhat

Tyr

TAC

No preference

10% highest RSCU weakly identifies TAT in subgenus Drosophila

Cys

TGC

No preference

 

Phe

TTC

---

10% highest RSCU identifies no preference in subgenus Drosophila

Ile

ATC

ATT

10% highest RCSU weakly identifies ATT in subgenus Drosophila