Clinical Study

Novel m.15434C > A (p.230L > I) Mitochondrial Cytb Gene Missense Mutation Associated with Dilated Cardiomyopathy

Table 2

Non-synonymous MT-CYB mutations identified in patients with CMPs.

VariantdCMP ( 𝑛 = 4 0 )hCMP ( 𝑛 = 3 0 )Co ( 𝑛 = 5 0 )Amino acid position, physicochemical propertyCIHaplogroup specific variantStatus

C14766T30/407/3026/50T7I, polar (T) to non polar (I)0.279B2a1a, M2b, E1a1, HVPolymorphism
A14769G2/400/300/50N8S, medium, polar (N) to small, polar (S)0.581L1b, L3f1b, L3f1bPolymorphism
T14798C1/400/305/50F18L, large, aromatic (F) to medium, hydrophobic (L)0.581J1c, T2g, K, L1c6Polymorphism
A14927G1/400/300/50T61A, medium, polar (T) to small, hydrophobic (A)0.581D4b1a, D5c, U6a1Polymorphism
G15257A1/400/300/50D171N, medium, acidic (D) to medium, polar (N)0.860K1b1a, M71a1, J2Possibly deleterious
G15314A1/400/301/50A190T, small, hydrophobic (A) to medium, polar (T)0.326R9b2, L3j, L3k, M38, D4a1a1, P4a, L3j,Polymorphism
A15326G8/405/3049/50T194A, medium, polar (T), to small, hydrophobic (A)0.442Z3a1, H2a2a, R7b1a, R8aPolymorphism
C15434A1/400/300/50L230I, both residues are medium and hydrophobic.0.977Non-haplogroup variants Novel missense mutation
C15452A2/400/306/50L236I, similar physicochemical property, both residues are medium size and hydrophobic0.744JTPolymorphism
G15803A1/400/300/50V353M, similar physicochemical property, both residues are medium size and hydrophobic0.395L2a2aPolymorphism
G15884C1/400/300/50A380P, small, hydrophobic (A) to medium, hydrophobic (P)0.047L0F2bPolymorphism

The tool PolyPhen-2 (http://genetics.bwh.harvard.edu/pph2/) was used for predicting the damaging effect of a missense mutation. The conservation index (CI) was computed by using MitoTool (http://www.mitotool.org/). The presence of the mutation as a haplogroup-specific variant was scored relative to the available global mtDNA phylogenetic tree by using Phylotree (http://phylotree.org/tree/main.htm). Co: controls.