Lefty (protein)

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left-right determination factor 1
Identifiers
Symbol LEFTY1
Alt. Symbols LEFTB
Entrez 10637
HUGO 6552
OMIM 603037
RefSeq NM_020997
UniProt O75610
Other data
Locus Chr. 1 q42.1
left-right determination factor 2
Identifiers
Symbol LEFTY2
Alt. Symbols TGFB4, EBAF
Entrez 7044
HUGO 3122
OMIM 601877
RefSeq NM_003240
UniProt O00292
Other data
Locus Chr. 1 q42.1

Lefty is a class of proteins that belongs to the TGF beta superfamily of proteins. It regulates TGFβ.

It is involved in embryogenesis and left-right patterning. There are many differences between the left and right sides, including heart and lung positioning. Mutations in these genes cause incorrect positioning of these organs (e.g. situs invertis). Lefty1 in the ventral midline prevents the Cerebrus (paracrine factor or "Caronte")signal from passing to the right side of the embryo.

There are two human subtypes: Lefty 1 and Lefty 2. Lefty2 may play a role in endometrial bleeding.

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