The studies of asthma and hay fever suggested that the prevalence of having both conditions was high (32%) and that they were more likely to occur together in monozygotic twins than they were in dizygotic
The researchers recruited 32 ASD-discordant twin pairs (one twin diagnosed with ASD and the other without ASD) enrolled in Sweden's Roots of Autism and ADHD Twin Study in Sweden (RATSS) from whom naturally shed deciduous teeth could be obtained; 17 were monozygotic pairs (MZ) and 15 were dizygotic
Genetic effects on baseline values of C-reactive protein and serum amyloid a protein: a comparison of monozygotic and dizygotic
By analysing data from a genome-scale study of DNA methylation in monozygotic and dizygotic
twins, researchers identified genomic regions at which the epigenetic similarity of monozygotic, or identical, twins are substantially greater than can be explained by their genetic identity.
A correlation has also been made between advanced maternal age and dizygotic
twinning rates .
The presence of two placenta at delivery, one separate placenta supplying female fetus and the other being shared by two male fetuses, but all of them having their own amnion, makes it dichorionic, dizygotic
, triamniotic triplet set.
In earlier twin studies, the rate of sarcoidosis was reported to be higher in monozygotic twins compared to dizygotic
Natera says that Panorama is the first NIPT that can determine whether twins are monozygotic (identical) or dizygotic
(non-identical/fraternal) as early as 9 weeks' gestation.
Most recently, a study comparing AD in identical and fraternal twins demonstrated concordance rates of up to 0.86 in monozygotic and 0.41 in dizygotic
pairs, providing clear evidence for a genetic predisposition to AD.
In contrast to adoption studies, classical comparison of Monozygotic (MZ) and Dizygotic
(DZ) twin studies assume that within-family environmental factors are controlled by gene dosage.
Genetic factors are considered to play a prominent role in disease onset as higher concordance rates in monozygotic twins than in dizygotic
twins and familial clustering of patients with PBC has been demonstrated in family and population studies [11-16].
There are two basic types of twins: dizygotic
(DZ), commonly referred to as fraternal twins, and monozygotic (MZ), referred to as identical twins.