Genomic organization and molecular phylogenies of the beta (β) keratin multigene family in the chicken (Gallus gallus) and zebra finch (Taeniopygia guttata): implications for feather evolution

Table 1 Expression of β-keratin Sequences in Chicken Tissue:

Sequence annotation	Cultured Newborn chick Keratinocytes	Embryonic chick claw tissue	Embryonic chick scale tissue	Embryonic chick feather	Adult chick feather	Embryonic chick beak
Claw	++	++++	++	+	unknown	+++
Feather	++	+*	+*	++++	++++	+*
Feather-like	unknown	none	+	++	++	none
Scale	++	+*	++++	+	unknown	+*
Keratinocyte	++	unknown	unknown	unknown	unknown	unknown

The sequence annotation for each type of β-keratin gene (claw, feather, feather-like, scale, and keratinocyte) is listed in the left column. The expression level is indicated as plus (+) signs, with more plus signs signifying higher levels of expression. The tissue source and developmental stage is designate at the top of each column. An asterisk indicates that a positive reaction was seen with antiserum for that specific β-keratin sequence [11–14, 64].

ISSN: 2730-7182