Total absence of protein 4.2 and partial deficiency of band 3 in hereditary spherocytosis.

Abstract:

:Unlike previously reported cases with total protein 4.2 deficiency due to mutations in the EPB42 gene, we describe a total deficiency in protein 4.2 with normal EPB42 alleles. Hereditary spherocytosis (HS) was observed in a Japanese woman (unsplenectomized) and her daughter (splenectomized). The mother showed a partial deficiency in band 3 and a proportional reduction in protein 4.2. She was heterozygous for a novel allele of the EPB3 gene, allele Okinawa, which contains the two mutations that define the Memphis II polymorphism (K56E, AAG-->GAG, and P854L, CCG-->CTG) and, additionally, the mutation: G714R, GGG-->AGG, located in a highly conserved position of transmembrane segment 9. The latter change was responsible for HS. In trans to allele Okinawa, the daughter displayed allele Fukuoka: G130R, GGA-->AGA, an allele known to alter the binding of protein 4.2 to band 3. The daughter presented with a more pronounced decrease of band 3, and lacked protein 4.2, resulting in aggravated haemolytic features. Although the father was not available for study, heterozygosity for allele Fukuoka has been documented in another individual who showed no clinical or haematological signs, and a normal content of band 3. We suggest that band 3 Okinawa binds virtually all the protein 4.2 in red cell precursors, band 3 Fukuoka being unable to do so, and that the impossibility of band 3 Okinawa incorporation into the membrane leads to degradation of the band 3 Okinawa protein 4.2 complex. In contrast, band 3 Fukuoka, free of bound protein 4.2, could then incorporate normally into the bilayer. Thus, protein 4.2 would not appear in the daughter's red cell membrane.

journal_name

Br J Haematol

authors

Kanzaki A,Hayette S,Morlé L,Inoue F,Matsuyama R,Inoue T,Yawata A,Wada H,Vallier A,Alloisio N,Yawata Y,Delaunay J

doi

10.1046/j.1365-2141.1997.4263231.x

subject

Has Abstract

pub_date

1997-12-01 00:00:00

pages

522-30

issue

3

eissn

0007-1048

issn

1365-2141

journal_volume

99

pub_type

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