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PABPCP2 encodes an abundant nuclear protein that binds with high affinity to nascent poly(A) tails.
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Autosomal dominant oculopharyngeal muscular dystrophy (OPMD) is an adult-onset disease caused by (GCG (show GCG Antibodies)) repeat expansions in exon 1 of the poly(A) binding protein 2 (show PABPN1 Antibodies) gene (PABP2)
Unequal crossing-over in unique PABP2 mutations in Japanese patients: a possible cause of oculopharyngeal muscular dystrophy.
This gene encodes an abundant nuclear protein that binds with high affinity to nascent poly(A) tails. The protein is required for progressive and efficient polymerization of poly(A) tails at the 3' ends of eukaryotic transcripts and controls the size of the poly(A) tail to about 250 nt. At steady-state, this protein is localized in the nucleus whereas a different poly(A) binding protein is localized in the cytoplasm. This gene contains a GCG trinucleotide repeat at the 5' end of the coding region, and expansion of this repeat from the normal 6 copies to 8-13 copies leads to autosomal dominant oculopharyngeal muscular dystrophy (OPMD) disease. Related pseudogenes have been identified on chromosomes 19 and X. Read-through transcription also exists between this gene and the neighboring upstream BCL2-like 2 (BCL2L2) gene.