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Amnionless, essential for mouse gastrulation, is mutated in recessive hereditary megaloblastic anemia.

Abstract：

:The amnionless gene, Amn, on mouse chromosome 12 encodes a type I transmembrane protein that is expressed in the extraembryonic visceral layer during gastrulation. Mice homozygous with respect to the amn mutation generated by a transgene insertion have no amnion. The embryos are severely compromised, surviving to the tenth day of gestation but seem to lack the mesodermal layers that normally produce the trunk. The Amn protein has one transmembrane domain separating a larger, N-terminal extracellular region and a smaller, C-terminal cytoplasmic region. The extracellular region harbors a cysteine-rich domain resembling those occurring in Chordin, found in Xenopus laevis embryos, and Sog, found in Drosophila melanogaster. As these cysteine-rich domains bind bone morphogenetic proteins (Bmps), it has been speculated that the cysteine-rich domain in Amn also binds Bmps. We show that homozygous mutations affecting exons 1-4 of human AMN lead to selective malabsorption of vitamin B12 (a phenotype associated with megaloblastic anemia 1, MGA1; OMIM 261100; refs. 5,6) in otherwise normal individuals, suggesting that the 5' end of AMN is dispensable for embryonic development but necessary for absorption of vitamin B12. When the 5' end of AMN is truncated by mutations, translation is initiated from alternative downstream start codons.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Tanner SM,Aminoff M,Wright FA,Liyanarachchi S,Kuronen M,Saarinen A,Massika O,Mandel H,Broch H,de la Chapelle A

doi

10.1038/ng1098

keywords:

subject

Has Abstract

pub_date

2003-03-01 00:00:00

pages

426-9

issue

3

eissn

1061-4036

issn

1546-1718

pii

ng1098

journal_volume

33

pub_type

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