Double coat / coat composition (CFA28/ADRB1 region) - Dog

What does this test analyse?

This genetic test analyses a CFA28 marker in a long non-coding RNA region upstream of ADRB1. The marker is used for double coat, coat composition, single coat and double-layered coat in dogs.

A double coat consists of coarse guard hairs with a softer undercoat underneath. A single coat usually lacks a clear undercoat. This difference matters in breeds where undercoat is part of the desired coat type, but also in crosses or lines where less undercoat and less seasonal shedding may be preferred.

Why coat composition matters

The undercoat influences insulation, protection, coat volume, grooming needs and seasonal shedding. The CFA28 region is strongly associated with presence or absence of undercoat. It should be interpreted as a marker trait: the visible coat type can still be influenced by other coat genes and breed background.

Practical value of this test

• The test helps breeders better predict whether offspring may develop a single or double coat.
• The result supports selection for desired coat structure, undercoat, grooming needs and shedding pattern.
• In crosses or breeds with variable coat types, the test adds information beyond appearance and pedigree.
• The marker is especially useful together with other coat genes, including hair length, curl, furnishings and shedding.

Inheritance and interpretation

The inheritance pattern has not been fully confirmed. In practical interpretation, C/C is mainly seen in dogs with double coat, T/T in dogs with single coat and T/C usually with single coat or less pronounced undercoat. Because other genes also shape the visible coat, the result should be considered together with the full coat-genetic profile.