Question: What is the genetic basis of propionic acidemia?

Context:
utations in the PCCA or PCCB genes coding for alpha and beta subunits of propionyl CoA carboxylase can cause propionic acidemia
propionic acidemia (PA) can result from mutations in either of the genes PCCA or PCCB, which encode the alpha and beta subunits, respectively, of the mitochondrial enzyme propionyl CoA-carboxylase
eficiency of propionyl-CoA carboxylase (PCC; alpha 4 beta 4) results in the rare, autosomal recessive disease propionic acidemia
PA is caused by mutations in either the PCCA or PCCB genes encoding the α- and β-subunits of the PCC enzyme 
eficiency of propionyl CoA carboxylase (PCC), a dodecamer of alpha and beta subunits, causes inherited propionic acidemia
Recent studies have identified the genomic mutations in the genes PCCA and PCCB
ropionic acidemia is an organic acidemia that can lead to metabolic acidosis
plicing defects account for 16% of the mutant alleles in the PCCA and PCCB genes, encoding both subunits of the propionyl-CoA carboxylase (PCC) enzyme, defective in propionic acidemia
ropionic acidemia (PA) is an autosomal recessive disorder of metabolism caused by a deficiency of propionyl-coenzyme A carboxylase (PCC)
In the PA patients, we have identified four different changes in the PCCA gene, including one novel one (c.414+5G>A) affecting the splicing process
utations in either the PCCA or PCCB genes are responsible for propionic acidemia (PA)
Propionic acidemia is a common organic acidemia, caused by deficiency of propionyl-CoA carboxylase (PCC), which catalyzes the carboxylation of propionyl-CoA to D-methylmalonyl-CoA. PCC is a dodecameric enzyme of alpha-PCC and beta-PCC subunits, nuclearly encoded by genes PCCA and PCCB, respectively. Mutation in either gene cause propionic acidemia
PA is inherited in an autosomal recessive fashion involving mutations in PCCA or PCCB encoding the alpha and beta subunits of propionyl-CoA carboxylase (PCC)
Two siblings affected with propionic acidemia were screened for putative mutations in PCCA and PCCB genes coding alpha and beta subunits of propionyl-coenzyme A (CoA) carboxylase
ropionic acidemia results from mutations in either of the two genes, PCCA or PCCB, that encode the two subunits of the propionyl-CoA carboxylase (PCC) enzyme
utations in the PCCA or PCCB genes, encoding both subunits of propionyl-CoA carboxylase, result in propionic acidemia
 we analyze splicing mutations identified in propionic acidemia patients to clarify their functional effects and their involvement in the disease phenotype. Two mutations in the PCCA gene detected in homozygous patients and involving consensus splice sequences 
An enzyme deficiency can result from mutations in either PCCA or PCCB.
(PA) is an inborn error of organic acid metabolism caused by a deficiency of propionyl-CoA carboxylase.
Mutations in either gene cause PA and to date, up to 47 different allelic variations in the PCCB gene have been identified in different population
ropionic acidemia (PA) is a recessive disorder caused by a deficiency of propionyl-CoA carboxylase (PCC), a dodecameric enzyme composed of two different proteins alpha-PCC and beta-PC
PCC is a multimeric protein composed of two different alpha- and beta-PCC subunits, nuclearly encoded by the PCCA and PCCB genes, respectively. Mutations in either gene cause the clinically heterogeneous disease propionic acidemia
More than 24 mutations have been found in the PCCA gene in patients with PA, 
ropionic acidemia (PA, MIM 232000 and 232050) is caused by a deficiency of mitochondrial biotin-dependent propionyl-CoA carboxylase (PCC, EC 6.4.1.3), a heteropolymeric enzyme composed of alpha and beta subunits, which are encoded by the PCCA and PCCB genes, respectively
Approximately 60 mutations have been reported in the nuclear genes PCCA and PCCB that encode the two PCC subunits
eficiency of propionyl-CoA carboxylase (PCC) results in propionic acidemia
ropionic acidemia can result from mutations in the PCCA or PCCB genes encoding the alpha and beta subunits
ropionic acidemia is an inherited metabolic disorder caused by deficiency of propionyl-CoA carboxylase, a dodecameric enzyme composed of alpha-PCC and beta-PCC subunits 
A genetic deficiency of PCC activity causes propionic acidemia, a potentially fatal disease with onset in severe cases in the newborn period. Affected patients may have mutations of either the PCCA or PCCB gene.
PCC is composed of two equal subunits, alpha and beta, which are encoded by two separate genes at two distinct human loci. Mutations of either gene in humans results in propionic acidemia (PA)
Deficiency of PCC results in propionic acidemia (PA), a metabolic disorder
 PCC consists of two subunits, alpha and beta, encoded by the PCCA and PCCB genes, respectively. Inherited PCC deficiency due to mutations in either gene results in propionic acidemia (PA),
mutations in the PCCA and PCCB genes causing propionic acidemia
Mutations in the PCCA and PCCB genes, which encode the a and b subunits of this heteropolymer, result in propionic acidemia (PA)
ropionic acidemia is a rare autosomal recessive disorder of intermediary metabolism. It is caused by a deficiency of the mitochondrial enzyme propionyl-CoA carboxylase (PCC, EC 6.4.1.3), a heteropolymeric protein composed of two subunits, alpha and beta
ropionic acidemia is an autosomal recessive disorder caused by a deficiency in the mitochondrial enzyme propionyl-CoA carboxylase (PCC). PCC is composed of two subunits, alpha and beta, encoded by the PCCA and PCCB genes,
Propionyl-CoA carboxylase (PCC) is a mitochondrial biotin-dependent enzyme composed of an equal number of alpha and beta subunits. Mutations in the PCCA (alpha subunit) or PCCB (beta subunit) gene can cause the inherited metabolic disease propionic acidemia (PA), which can be life threatening in the neonatal period. Lack of data on the genomic structure of PCCB has been a significant impediment to full characterization of PCCB mutant chromosomes. In this study, we describe the genomic organization of the coding sequence of the human PCCB gene and the characterization of mutations causing PA in a total of 29 unrelated patients-21 from Spain and 8 from Latin America. The implementation of long-distance PCR has allowed us to amplify the regions encompassing the exon/intron boundaries and all the exons. The gene consists of 15 exons of 57-183 bp in size. All splice sites are consistent with the gt/ag rule. The availability of the intron sequences flanking each exon has provided the basis for implementation of screening for mutations in the PCCB gene. A total of 56/58 mutant chromosomes studied have been defined, with a total of 16 different mutations detected. The mutation spectrum includes one insertion/deletion, two insertions, 10 missense mutations, one nonsense mutation, and two splicing defects. Thirteen of these mutations correspond to those not described yet in other populations. The mutation profile found in the chromosomes from the Latin American patients basically resembles that of the Spanish patients.
Inherited deficiency of PCC due to mutations in either the PCCA or the PCCB gene results in propionic acidemia (PA)
Mutations of the PCCA (alpha subunit) or PCCB (beta subunit) gene cause the inherited metabolic disease, propionic acidemia
We have detected three types of mutation in the same exon of the coding sequence of beta-subunit of PCC
ropionic acidemia is an inborn error of organic acid metabolism caused by deficiency of propionyl-CoA carboxylase
we have identified two mutations of the PCCB gene in a propionic acidemia patient
ropionic acidemia is an inherited disorder of organic acid metabolism that is caused by deficiency of propionyl-CoA carboxylase (PCC; EC 6.4.1.3). Affected patients fall into two complementation groups, pccA and pccBC (subgroups B, C, and BC), resulting from deficiency of the nonidentical alpha and beta subunits of PCC
ropionic acidemia (PA) is an autosomal recessive inborn error
It is caused by a deficiency of propionyl-CoA carboxylase
PCC is a heteropolymeric enzyme composed of alpha- and beta-subunits.
Mutation analysis confirmed the diagnosis of propionic acidemia (PA) with compound heterozygosity for 2 new missense mutations L417W/Q293E in the PCCA gene

Answer: Mutations in the PCCA or PCCB genes, encoding both subunits of propionyl-CoA carboxylase.