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Cis AB is a type of rare mutation in the ABO gene. It happens when the transferase allele contains a mix of amino acids from either A or B alleles, producing a bifunctional enzyme that can produce both types of antigens, usually with one weaker than the other. This results in a serum test result much like the standard, separate (trans) AB ...
Since the mutations are recessive, the offspring will display the wild-type phenotype. A complementation test (sometimes called a "cis-trans" test) can test whether the mutations in two strains are in different genes. Complementation is usually weaker or absent if the mutations are in the same gene.
The cis or trans nonallelic or interlocus gene conversion events occur between nonallelic gene copies residing on sister chromatids or homologous chromosomes, and, in case of interallelic, the gene conversion events take place between alleles residing on homologous chromosomes.
Additionally, each trans-regulatory element affects a large number of genes on both alleles, [2] while cis-regulatory element is allele specific [1] [2] and only controls genes nearby. Exonic and promoter sequences of the genes are significantly more conserved than the genes in cis- and trans- regulatory elements. [3]
The haplotype encodes DQ2.5 cis isoform, referring to the cis arrangement of the DQA1*05 01 and DQB1*02 01 on the same variant of chromosome 6. The isoform can also be encoded trans-haplotype (between two sister chromosomes) forming the DQ2.5 trans isoform. This isoform occurs when a person has the DQ7.5/DQ2.2 phenotype.
Gene duplication may occur via cis-duplication or trans duplication. Cis-duplication, or intrachromosomal duplication, entails the duplication of genes within the same chromosome whereas trans duplication, or interchromosomal duplication, consists of duplicating genes on neighboring but separate chromosomes. [7]
A transheterozygote between Egfr and Notch has the genotype Notch/+ ; Egfr/+ (where Notch and Egfr represent mutant alleles, and + represents wildtype alleles). The dominant interaction between Egfr and Notch suggested that the Egfr and Notch signalling pathways act together within the cell to affect the pattern of veins in the fly's wings.
In medical genetics, compound heterozygosity is the condition of having two or more heterogeneous recessive alleles at a particular locus that can cause genetic disease in a heterozygous state; that is, an organism is a compound heterozygote when it has two recessive alleles for the same gene, but with those two alleles being different from each other (for example, both alleles might be ...