Human tenascin-R. Complete primary structure, pre-mRNA alternative splicing and gene localization on chromosome 1q23-q24.
We have established the primary structure of human tenascin-R (TN-R), a component of the extracellular matrix of the central nervous system, by sequencing cDNA clones which cover its complete coding region. The deduced amino acid sequence of human TN-R (1358 amino acids) showed a homology to chicken and rat TN-R of 75 and 93%, respectively. By reverse transcriptase-polymerase chain reaction we have studied the existence of TN-R isoforms generated by pre-mRNA alternative splicing in various human astrocytomas and meningiomas. Our findings demonstrate the existence of a human isoform in which one fibronectin-like repeat is omitted. Northern blot analysis of the poly(A)-rich RNA from different tissues showed two mRNAs having sizes of about 10 and 11 kilobases. Using DNA from a panel of human-hamster and human-mouse somatic cell hybrids and by fluorescence in situ hybridization, we have assigned the gene for human TN-R to the region 1q23-q24. The mouse mutation loop-tail (Lp), which has been proposed as a model for human neural tube defects, maps to region of mouse chromosome 1 syntenic with human 1q23-q24.
Carnemolla
B
B
Laboratory of Cell Biology, Istituto Nazionale per la Ricerca sul Cancro, Largo Rosanna Benzi, 10, 16132 Genoa, Italy.
Leprini
A
A
Borsi
L
L
Querzé
G
G
Urbini
S
S
Zardi
L
L
D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000818:Animals; D015815:Cell Adhesion Molecules / Q000737:chemistry / Q000235:genetics; D002645:Chickens; D002878:Chromosomes, Human, Pair 1; D003001:Cloning, Molecular; D018076:DNA, Complementary; D005786:Gene Expression Regulation; D006801:Humans; D008969:Molecular Sequence Data; D012322:RNA Precursors / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D012091:Repetitive Sequences, Nucleic Acid; D017386:Sequence Homology, Amino Acid; D019063:Tenascin / Q000737:chemistry / Q000235:genetics*
D015815:Cell Adhesion Molecules; D018076:DNA, Complementary; D012322:RNA Precursors; D012333:RNA, Messenger; D019063:Tenascin; C074638:tenascin R