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The Journal of Heredity 1992:83(2):152-155
© 1992 The American Genetic Association 83:152-155

other

Microphthalmia-4: A Sex-Influenced Inherited Eye Condition of the Chicken

R. G. Somes, Jr.

Department of Nutritional Sciences, Box U-17, Room 109, The University of Connecticut 3624 Horsebarn Road Extension, Storrs, CT 06269-4017

Abstract

A new mutation of the chicken that causes a reduction in eyeball size is described. Eyeball size reduction is extreme in over 80% of affected individuals. Two-thirds of affected chickens have bilateral expression, while the rest are unilaterally affected. The trait appears to affect liveability beyond that which might be expected of blind individuals. Embryonic mortality was increased five-fold among microphthalmic individuals, and all but two of the 35 microphthalmic chicks that hatched died within a week. Data from various crosses indicate that this condition is inherited as an autosomal recessive with expression being limited primarily to females. The name microphthalmia-4 and the gene symbol mi-4 are proposed for this trait.


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