Abstract:
OBJECTIVE:Alaska Native and other circumpolar indigenous populations have historically experienced high infant mortality rates, for unknown reasons. Through routine newborn screening, Alaskan and Canadian indigenous infants have been found to have a high frequency of a single sequence variant (c.1436C→T) in the gene coding for carnitine palmitoyltransferase type 1A (CPT1A). We sought to determine whether these 2 findings were related. METHODS:As part of a quality control exercise at the Alaskan Newborn Metabolic Screening Program, we conducted genotyping for 616 consecutively born, Alaska Native infants and reviewed their medical records. We conducted an ecological analysis comparing Census area-level variant CPT1A allele frequency and historical Alaska Native infant, postneonatal, and neonatal mortality rates. RESULTS:Infant death was identified for 5 of 152 infants homozygous for the c.1436C→T sequence variant (33 deaths per 1000 live births), 2 of 219 heterozygous infants (9 deaths per 1000 live births), and 0 of 245 infants carrying no copies of the variant allele (χ(2) = 9.2; P = .01). All 7 cases of infant death had some evidence of an infectious process at the time of death, including 5 with respiratory infections. Census areas with the highest frequency of the variant allele had the highest historical infant, postneonatal, and neonatal mortality rates. CONCLUSIONS:Our data provide preliminary evidence that a highly prevalent CPT1A variant found among Alaska Native and other indigenous circumpolar populations may help explain historically high infant mortality rates. Larger definitive studies are needed.
journal_name
Pediatricsjournal_title
Pediatricsauthors
Gessner BD,Gillingham MB,Birch S,Wood T,Koeller DMdoi
10.1542/peds.2010-0687subject
Has Abstractpub_date
2010-11-01 00:00:00pages
945-51issue
5eissn
0031-4005issn
1098-4275pii
peds.2010-0687journal_volume
126pub_type
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