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J R Batanian

Publications and source records attributed to J R Batanian.

26 records · Page 2Linked to original sources
PubMed1998

A simple VNTR-PCR method for detecting maternal cell contamination in prenatal diagnosis.

The effectiveness of variable number tandem repeats (VNTRs) was evaluated in the detection of maternal cell contamination. Nonradioactive PCRs were performed on 30 sets of prenatal tissue using VNTRs as primers. The combination of two VNTRs (YNZ22 and APOB) provided information on all 30 cases, distinguishing maternal-fetal genotype patterns and detecting maternal cell contamination in 5 of 30 prenatal cases. The amplification of these two VNTRs does not require radioactive or fluorescence labeling, and a small gel electrophoresis is sufficient to see the maternal-fetal genotype pattern. By this method, detection of maternal cell contamination in prenatal tissues can be obtained in 1 day, without the use of expensive instruments, thus providing DNA laboratories a very sensitive, rapid, and simple proof pretest on all prenatal tissues before performing the final genetic diagnostic testing.

Amniocentesis↗
PubMed1995

Genomic organization of the human gene (CA5) and pseudogene for mitochondrial carbonic anhydrase V and their localization to chromosomes 16q and 16p.

Carbonic anhydrase V (CA V) is expressed in mitochondrial matrix in liver and several other tissues. It is of interest for its putative roles in providing bicarbonate to carbamoyl phosphate synthetase for ureagenesis and to pyruvate carboxylase for gluconeogenesis and its possible importance in explaining certain inherited metabolic disorders with hyperammonemia and hypoglycemia. Following the recent characterization of the cDNA for human CA V, we report the isolation of the human gene from two lambda genomic libraries and its characterization. The CA V gene (CA5) is approximately 50 kb long and contains 7 exons and 6 introns. The exon-intron boundaries are found in positions identical to those determined for the previously described CA II, CA III, and CA VII genes. Like the CA VII gene, CA5 does not contain typical TATA and CAAT promoter elements in the 5' flanking region but does contain a TTTAA sequence 147 nucleotides upstream of the initiation codon. CA5 also contains a 12-bp GT-rich segment beginning 13 bp downstream of the polyadenylation signal in the 3' untranslated region of exon 7. FISH analysis allowed CA5 to be assigned to chromosome 16q24.3. An unprocessed pseudogene containing sequence homologous to exons 3-7 and introns 3-6 was also isolated and was assigned by FISH analysis to chromosome 16p11.2-p12.

Amino Acid Sequence↗
PubMed1994

Familial translocation t(10;14) (q26.1;q32.3): report of three offspring with 10q deletion and 14q duplication.

We describe two brothers and a cousin with common clinical features, including mild mental retardation, motor delays, hypotonia with truncal ataxia, esotropia, and mild facial and hand dysmorphia. The initial routine chromosome study failed to detect any abnormality in the proband. Based on a high index of clinical suspicion, high-resolution chromosome studies were performed on the proband's parents. A small reciprocal translocation t(10;14) (q26.1;q32.3) was detected in the father. The breakpoint on the derivative chromosome 14 was further placed telomeric to the immunoglobulin heavy-chain gene cluster at the band q32.33 by fluorescence in situ hybridization. Studies of the proband and two affected paternal cousins revealed that each had inherited the same derivative chromosome 10 from their carrier parents. This unbalanced karyotype resulted from an adjacent-1 segregation of the 10;14 translocation.

Abnormalities, Multiple↗
PubMed1993

Genomic organization and localization of gene for human carbonic anhydrase IV to chromosome 17q.

Carbonic anhydrase IV (CA IV) is a glycosylphosphatidylinositol-anchored membrane isozyme expressed on the luminal surfaces of pulmonary (and certain other) capillaries and on the luminal surface of proximal renal tubules. It is of interest for its functional importance in CO2 and HCO3- transport, its ancient evolutionary status among CA isozymes, and its possible role in inherited renal abnormalities of HCO3- transport. To determine the localization of the CA IV gene and define its genomic structure, we isolated and characterized a full-length genomic clone. The 9.5-kb gene contains eight exons and seven introns. The first exon (exon 1a) encodes the signal sequence. Exons 1b through 7 encode the remaining coding sequence. Exon 7 encodes the C terminus of the enzyme precursor, the C terminus of the mature protein and also contains the 120-bp sequence corresponding to the 3' untranslated region of the cDNA. The positions of introns 3, 4, 5, and 6 are identical with the corresponding positions of introns in the genes for the soluble CA isozymes (CA I, II, III, and VII). However, intron 1a is not found in these genes, and the positions of introns 1b and 2 in CA IV differ from the positions of the corresponding introns in genes for the soluble isozymes. The 5' upstream region of the gene (-500 to -1) is GC rich and contains 30 CpG dinucleotides. A TATA box sequence and a potential Sp1 binding site are identified upstream of the first exon. By using PCR on DNA from human/rodent somatic cell hybrids, the CA IV gene was assigned to chromosome 17.(ABSTRACT TRUNCATED AT 250 WORDS)

Amino Acid Sequence↗
PubMed1990

Rapid diagnosis of Miller-Dieker syndrome and isolated lissencephaly sequence by the polymerase chain reaction.

Probe YNZ22 (D17S5) is a highly polymorphic, variable number tandem repeat (VNTR) marker previously shown to be deleted in all patients with the Miller-Dieker syndrome (MDS) but not in patients with isolated lissencephaly sequence (ILS). Primers were constructed to the unique sequence flanking the polymorphic, repetitive region of YNZ22 for amplification by the polymerase chain reaction (PCR). Analysis of 118 normal individuals revealed 12 alleles (differing in copy number of a 70-bp repeat unit) ranging in size from 168 to 938 bp. A retrospective study of eight MDS and six ILS patients was consistent with Southern blot analysis in all cases except one. In the latter, a very large allele (12 copies of the repeat unit) in a patient and her mother failed to amplify on initial attempts, but was successfully amplified by reducing the concentration of genomic DNA used in the reaction. Prospective studies on two MDS and five ILS patients were successfully performed and confirmed in all cases by Southern blot analysis. From the total sample, restriction fragment length polymorphism (RFLP) analysis was fully informative in four of ten MDS patients and showed a deletion in all four cases. Nine of eleven ILS patients were heterozygous and therefore not deleted for YNZ22. Development of primers for additional polymorphic markers in the Miller-Dieker region will lead to a rapid PCR-based diagnostic approach for all MDS and ILS patients. PCR typing of YNZ22 will also facilitate use of this marker in other applications, including genetic linkage, paternity and forensic studies, and analysis of loss of heterozygosity in tumors.

Abnormalities, Multiple↗
PubMedDate not supplied

Spontaneous resolution of myelodysplastic cytogenetic abnormality developed during the treatment of leukemia.

PURPOSE: We describe the spontaneous resolution of a myelodysplastic cytogenetic abnormality developing during the treatment of acute lymphocytic leukemia. PATIENTS AND METHODS: A 6-year-old girl with acute lymphocytic leukemia had a clinical picture of myelodysplasia 18 months after diagnosis. The clonal cytogenetic abnormality, 46,XX,del(5)(q12q12), resolved spontaneously 4 months after the discontinuation of chemotherapy. Maintenance chemotherapy was resumed 1 month later and continued for an additional 9 months. Currently, she has been off therapy for 10 months. CONCLUSION: A myelodysplastic clonal cytogenetic abnormality developing during treatment may cause some confusion for management. This study demonstrates that spontaneous resolution is possible and that bone marrow transplantation or other intensive treatment may not be necessary.

Bone Marrow↗