A novel pleckstrin homology-related gene family defined by Ipl/Tssc3, TDAG51, and Tih1 : tissue-specific expression, chromosomal location, and parental imprinting.

• We previously described a gene, Ipl (Tssc3), that is expressed selectively from the maternal allele in placenta, yolk sac, and fetal liver and that maps within the imprinted domain of mouse distal Chromosome (Chr) 7/human Chr 11p15.5 (Hum Mol Genet 6, 2021, 1997). Ipl is similar to TDAG51, a gene that is involved in FAS/CD95 expression. Here we describe another gene, Tih1 (TDAG/Ipl homologue 1), with equivalent sequence similarity to Ipl. Structural prediction indicates that the products of these three genes share a central motif resembling a pleckstrin-homology (PH) domain, and TIH1 protein has weak sequence similarity to the PH-domain protein SEC7/CYTOHESIN. Like Ipl, Tih1 is a small gene with a single small intron. Tih1 maps to distal mouse Chr 1 and human Chr 1q31, chromosomal regions that have not shown evidence for imprinting and, in contrast to Ipl, Tih1 is expressed equally from both parental alleles. Ipl, Tih1, and TDAG51 have overlapping but distinct patterns of expression. Tih1 and TDAG51 are expressed in multiple fetal and adult tissues. In contrast, during early mouse development Ipl mRNA and protein are highly specific for two tissues involved in maternal/fetal exchange: visceral endoderm of the yolk sac and labyrinthine trophoblast of the placenta. These findings highlight the dominance of chromosomal context over gene structure in some examples of parental imprinting and extend previous evidence for placenta-specific expression of imprinted genes. The data also define a new subfamily of PH domain genes.

Nyckelord

Amino Acid Motifs

Amino Acid Sequence

Animals

Base Sequence

Blood Proteins/*chemistry/genetics

Chromosomes; Human; Pair 1/genetics

Codon; Initiator/genetics

Embryo/cytology/metabolism

Gene Expression Regulation; Developmental

Genomic Imprinting/*genetics

Humans

Introns/genetics

Mice

Molecular Sequence Data

Multigene Family/*genetics

Nuclear Proteins

Organ Specificity

Phosphoproteins

Physical Chromosome Mapping

Protein Conformation

Proteins/chemistry/*genetics/metabolism

RNA; Messenger/analysis/genetics

Sequence Homology; Amino Acid

Transcription Factors/chemistry/genetics

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