It is difficult to control disorders with a polygenic
mode of inheritance as the exact genes which cause such a disease and the non-genetic factors which will influence expression are unknown.
Not exact matches
In a commentary accompanying the report, Paul Soloway
of Cornell University remarks: «A particularly intriguing possibility is that such RNAs regulate other non-genetic
modes of inheritance, such
as metabolic or behavioral imprinting.»
Little is known about the
mode of inheritance; that is, whether they are simple
as progressive retinal atrophy and sebaceous adenitis are in some breeds or are, like hip dysplasia, a complex association
of many genes.
Dramatic, complete and immediate removal
of carriers from a closed / highly related population such
as Italian Greyhound's would definitely not be recommended if we were certain
of an Autosomal Recessive
mode of inheritance.
As there is no evidence to suggest a
mode of inheritance for this problem, CERF considers it a «breeder option» to breed affected animals.
Epilepsy in beagles was thought to be homologous to Lafora's disease in man based on the similar findings from histopathological examination 23 and the
mode of inheritance was described
as autosomal recessive with a sex - linked «suppressor» 4, 5.
Genetic disorders without a known
mode of inheritance should be managed in the same way
as polygenic disorders.
As stated by Dr. Rubin, it has been assumed that the
mode of inheritance is recessive (both parents are carriers), and affected animals are not to be considered to have normal eyes.
PHPV / PTVL is recognized
as inherited in some breeds but no
mode of inheritance has been identified in breeds thus far studied.
A recessive
mode of inheritance has been suggested for congenital cataracts and microphthalmia in the Miniature Schnauzer [112]
as well
as cataracts in the Entlebucher mountain dog [113], the Bichon Frise [114] and the American Cocker spaniel [115].
Retinal dysplasia appears to be inherited
as an autosomal trait, at least in those breeds where sufficient numbers
of individuals have been studied to reliably estimate the
mode of inheritance [82 — 84].
In contrast, an autosomal dominant
mode of inheritance with a high degree
of penetrance has been suggested for the pulverulent (dust - like) form
of cataract observed in the Norwegian Buhund [116] and autosomal dominant with variable penetrance has been suggested for inherited posterior polar subcapsular cataracts in the Labrador and Golden retriever [117], although current anecdotal evidence indicates that in the Labrador cataracts could also be inherited
as an autosomal recessive trait.
The
mode of inheritance is
as an «autosomal recessive.»
The
mode of inheritance for this condition for many years now has been characterized
as autosomal recessive meaning that affected dogs have inherited the mutant gene from both parents.