Identification of two mutant alleles of transcobalamin II in an affected family.

Abstract:

:Transcobalamin II (TC II) deficiency is a rare autosomal recessive disease leading to cobalamin (Cbl; Vitamin B12) deficiency characterized by failure to thrive, megaloblastic anemia, impaired immunodefence and neurological manifestations. By means of Southern blotting and sequence analysis of TC II cDNA amplified from fibroblasts of an affected child and his parents, we have identified two mutant TC II alleles, one with a gross deletion and the other with a 4 nucleotide deletion. Both the mutations caused TC II mRNA and protein deficiency and hence defective plasma transport of Cbl and the development of Cbl deficiency in the affected child. The present study has identified molecular defects that cause TC II deficiency and lead to intracellular Cbl deficiency in humans.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Li N,Rosenblatt DS,Kamen BA,Seetharam S,Seetharam B

doi

10.1093/hmg/3.10.1835

subject

Has Abstract

pub_date

1994-10-01 00:00:00

pages

1835-40

issue

10

eissn

0964-6906

issn

1460-2083

journal_volume

3

pub_type

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