Table 1 

Comparison of putative linkage groups in Arctic charr and brook charr based upon comparative alignments of homologous marker segments to the rainbow trout genome (see Additional File 9 for these arm assignments) 

Arctic charr linkage group 
Chromosome Type* 
Brook charr linkage group 
Chromosome Type* 
No. of BC arms detected 


AC1 
M 
BC1 
M 
2 
AC3 
M 
BC3 
M 
2 
AC4 
M 
BC4** 
M 
2 
AC5 
A 
BC5 
A 
1 
AC6 
A? 
BC6 
A? 
1 
AC7 
A 
BC7 
A 
1 
AC8 
M 
BC8 
A? 
1 
AC9 
A 
BC9 
A 
1 
AC10 
A 
BC10 
M^{1} 
2 
AC11 
A 
BC11 
A 
1 
AC12 
A 
BC12 
A 
1 
AC13 
M 
BC13a 
A 
1 
BC13b 
A 
1 

AC14 
A 
BC14 
A 
1 
AC15 
M? 
BC15 
M? 
2 
AC16 
A 
BC16** 
M^{2} 
2 
AC17 
A 
BC17 
M^{3}? 
2 
AC18 
M 
BC18 
M 
2 
AC19 
M? 
BC19a 
A 
1 
arm b in BC17 
see^{3} 

AC20 
M 
BC20a 
A 
1 
BC20b 
A 
1 

AC21 
A 
BC21 
A 
1 
AC22 
A 
BC22 
A 
1 
AC23 
M? 
BC23b 
A 
1 
arm a in BC35 
see^{5} 

AC24 
A 
BC24 
A 
1 
AC25 
M 
BC25 
M? 
2 
AC26 
A 
arm in BC30 
see^{4} 

AC27 
A? 
BC27 
A 
1 
AC28 
M 
BC28a 
A 
1 
arm b in BC16** 
see^{2} 

AC30 
A 
BC30 
M^{4} 
2 
AC31 
A 
? 

AC32 
A 
BC32 
A 
1 
AC33 
A 
? 

AC34 
A 
BC34 
A 
1 
AC35 
A 
BC35 
M^{5} 
2 
AC36 
A 
BC36 
A 
1 
AC37 
A 
BC37 
A 
1 
AC39 
A 
arm in BC10 
see^{1} 

AC43 
A 
BC43 
A 
1 


Total No. Arms 
49 
total arms 
46 



* Chromosome is defined as either metacentric (M) or acrocentric (A). ** Polymorphisms were detected with both BC4 and BC16 linkage groups. BC4 appears to form a metacentric linkage group in females, but a singleton position was detected with SSOSL32 in HL7 male, suggesting the formation of two acrocentrics. BC16 markers appear to form a larger linkage group in the HL7 female (= metacentric structure), but only form two smaller linkage group clusters in the HL3 female (= 2 acrocentric linkage groups?). Superscripts ^{1, 2, 3, 4, 5 }indicates that two Arctic charr chromosome arms are part of a single brook charr metacentric chromosome. see^{15 }designates which Arctic charr chromosome arm appears to be part of the brook charr metacentric having the same superscript numeral. 

Timusk et al. BMC Genetics 2011 12:68 doi:10.1186/147121561268 