They mention the allele α-LEPRA as also implicated in hereditary spherocytosis, a C>T substitution at position -99 of intron 30. They say this is linked in cis to the α-IIs (A970D) substitution. The α-LEPRA variant appears to be implicated as the causal variant.
Mentions finding of the A970D variant and concludes it is in linkage disequilibrium with another causal variant.
This paper mentions A970D as a functionally neutral allele that is associated with α-LEPRA: “PCR screening of mutation αLEPRA and a functionally neutral mutation, Bughill (C→A, at position 11 of exon 21; GCT→GAT: A970D), which is inconstantly carried by allele αLEPRA”.
This variant is noted to be linked to alpha-LEPRA and is seen frequently in individuals with recessive Hereditary pyropoikilocytosis.