Animal Molecular Breeding 2024, Vol.14, No.4, 280-287 http://animalscipublisher.com/index.php/amb 281 a molecule with anti-inflammatory properties. The allergenic properties of Fel d 1 are significant, as it is the most common cause of allergic asthma related to cats worldwide (Kaiser et al., 2003). 2.2 Genetic factors influencing human sensitivity to Fel d 1 Human sensitivity to Fel d 1 can vary, and genetic factors play a crucial role in this variability. The sequence of genes coding for Fel d 1, such as Ch1 and Ch2, can influence the allergenic properties of the protein. In Siberian cats, mutations in these genes have been identified, which may affect the synthesis of Fel d 1 and potentially reduce its allergenic properties. These genetic variations could serve as markers for breeding cats with lower allergenic potential (Sartore et al., 2017). 2.3 Other proteins involved in cat allergies While Fel d 1 is the most significant allergen, other proteins may also contribute to cat allergies. The presence of multiple allergens in cat dander complicates the allergic response in humans. However, the focus remains on Fel d 1 due to its dominant role in triggering allergic reactions (Butt et al., 2012). The development of hypoallergenic cats, such as those with reduced Fel d 1 levels through genetic modifications, represents a promising approach to mitigating allergic reactions in sensitive individuals (Lee et al., 2023). In summary, Fel d 1 is the primary allergen responsible for cat allergies, with genetic factors influencing its allergenic properties. Understanding these genetic influences can aid in breeding hypoallergenic cats, potentially reducing allergic reactions in humans. 3 Genetic Mechanisms Underlying Hypoallergenic Traits in Cats 3.1 Identification of hypoallergenic cat breeds Hypoallergenic cat breeds are often identified based on their reduced production of the Fel d 1 protein, which is the primary allergen responsible for allergic reactions in humans. The Siberian cat is one such breed that is believed to have lower levels of this allergen. Genetic studies have shown that certain mutations in the genes responsible for Fel d 1 production may contribute to this reduced allergenic potential (Sartore et al., 2017). Additionally, the concept of hypoallergenic breeds has been commercialized, with companies marketing specific breeds as hypoallergenic, although scientific validation of these claims is limited (Butt et al., 2012). 3.2 Genetic variations related to hypoallergenic traits Genetic variations that may contribute to hypoallergenic traits in cats include mutations in the Ch1 and Ch2 genes, which code for the Fel d 1 protein. In Siberian cats, specific mutations in these genes have been identified, which could potentially alter the allergenic properties of Fel d 1, thereby reducing its allergenic potential (Sartore et al., 2017; Anderson et al., 2021). These genetic variations are crucial for understanding how hypoallergenic traits can be selected and bred into cat populations. 3.3 Role of the Fel d 1 protein expression in hypoallergenic cats The Fel d 1 protein is the major allergen in cats, and its expression levels are a key factor in determining the allergenic potential of a cat. Research indicates that certain breeds, like the Siberian cat, may have genetic mutations that lead to lower expression levels of Fel d 1, thus making them more suitable for individuals with allergies (Sartore et al., 2017). The identification of these genetic markers is essential for breeding programs aimed at producing hypoallergenic cats. However, the commercial claims of hypoallergenic breeds often lack comprehensive scientific backing, highlighting the need for further research in this area (Butt et al., 2012; Abitbol et al., 2024). In summary, the identification of hypoallergenic cat breeds, understanding genetic variations related to hypoallergenic traits, and the role of Fel d 1 protein expression are critical components in breeding cats with reduced allergenic potential. These insights can guide future breeding programs and help in developing scientifically validated hypoallergenic cat breeds.
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