Biomaterial Database

[A new method for calculating paternity index]. 2009

De-Jian Lü, and Hui-Ling Lu

Department of Forensic Biology, Zhongshan Medical College of Sun Yat-sen University, Guangzhou 510089, China. lvdejian@mail.sysu.edu.cn

OBJECTIVE To introduce a new method for calculating the paternity index (PI). METHODS Assuming that each allele from parents has undergone a transition before it segregates and transmits to child. The transition probability is 1 when parent allele is the same as child's, the transition probability is 0 when parent allele is different from the child's. Every allele has a transmission probability with 0.5. Base on these theories, it is easy to gain the probability that child inherits an allele from the alleged father or mother. Thus, the X value (numerator) and Y value (denominator) of PI formula can be calculated, as unknown man provide an allele for child with the allele frequency. RESULTS A general formula that calculated the PI for trios, duos and missing child cases was deduced. CONCLUSIONS The new method is practical in all kinds of forensic paternity case.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D010287	Parent-Child Relations	The interactions between parent and child.	Parent-Offspring Interaction,Parent Child Relationship,Parent-Child Relationship,Interaction, Parent-Offspring,Parent Child Relations,Parent Child Relationships,Parent Offspring Interaction,Parent-Child Relation,Parent-Child Relationships,Parent-Offspring Interactions,Relation, Parent-Child,Relationship, Parent Child,Relationship, Parent-Child
D010334	Paternity	Establishing the father relationship of a man and a child.	Paternities
D002648	Child	A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL.	Children
D005260	Female		Females
D005787	Gene Frequency	The proportion of one particular in the total of all ALLELES for one genetic locus in a breeding POPULATION.	Allele Frequency,Genetic Equilibrium,Equilibrium, Genetic,Allele Frequencies,Frequencies, Allele,Frequencies, Gene,Frequency, Allele,Frequency, Gene,Gene Frequencies
D005838	Genotype	The genetic constitution of the individual, comprising the ALLELES present at each GENETIC LOCUS.	Genogroup,Genogroups,Genotypes
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000465	Algorithms	A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.	Algorithm
D000483	Alleles	Variant forms of the same gene, occupying the same locus on homologous CHROMOSOMES, and governing the variants in production of the same gene product.	Allelomorphs,Allele,Allelomorph