17-44251588-C-A

Variant names:

• chr17-44251588-C-A
• NM_000342.4:c.2312G>T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP3_Moderate PP5

The NM_000342.4(SLC4A1):​c.2312G>T​(p.Gly771Val) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SLC4A1 NM_000342.4 missense, splice_region
• Scores: Splicing: ADA: 0.9999
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 6.07

Genes affected

SLC4A1 (HGNC:11027): (solute carrier family 4 member 1 (Diego blood group)) The protein encoded by this gene is part of the anion exchanger (AE) family and is expressed in the erythrocyte plasma membrane, where it functions as a chloride/bicarbonate exchanger involved in carbon dioxide transport from tissues to lungs. The protein comprises two domains that are structurally and functionally distinct. The N-terminal 40kDa domain is located in the cytoplasm and acts as an attachment site for the red cell skeleton by binding ankyrin. The glycosylated C-terminal membrane-associated domain contains 12-14 membrane spanning segments and carries out the stilbene disulphonate-sensitive exchange transport of anions. The cytoplasmic tail at the extreme C-terminus of the membrane domain binds carbonic anhydrase II. The encoded protein associates with the red cell membrane protein glycophorin A and this association promotes the correct folding and translocation of the exchanger. This protein is predominantly dimeric but forms tetramers in the presence of ankyrin. Many mutations in this gene are known in man, and these mutations can lead to two types of disease: destabilization of red cell membrane leading to hereditary spherocytosis, and defective kidney acid secretion leading to distal renal tubular acidosis. Other mutations that do not give rise to disease result in novel blood group antigens, which form the Diego blood group system. Southeast Asian ovalocytosis (SAO, Melanesian ovalocytosis) results from the heterozygous presence of a deletion in the encoded protein and is common in areas where Plasmodium falciparum malaria is endemic. One null mutation in this gene is known, resulting in very severe anemia and nephrocalcinosis. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.
• PP5: Variant 17-44251588-C-A is Pathogenic according to our data. Variant chr17-44251588-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 992923.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC4A1	NM_000342.4	c.2312G>T	p.Gly771Val	missense_variant, splice_region_variant	Exon 18 of 20	ENST00000262418.12	NP_000333.1
SLC4A1	XM_011525129.3	c.2222G>T	p.Gly741Val	missense_variant, splice_region_variant	Exon 17 of 19		XP_011523431.1
SLC4A1	XM_005257593.6	c.2117G>T	p.Gly706Val	missense_variant, splice_region_variant	Exon 16 of 18		XP_005257650.1
SLC4A1	XM_011525130.2	c.*22G>T		3_prime_UTR_variant	Exon 18 of 18		XP_011523432.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC4A1	ENST00000262418.12	c.2312G>T	p.Gly771Val	missense_variant, splice_region_variant	Exon 18 of 20	1	NM_000342.4	ENSP00000262418.6
SLC4A1	ENST00000399246.3	c.1214G>T	p.Gly405Val	missense_variant, splice_region_variant	Exon 13 of 15	5		ENSP00000382190.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary spherocytosis type 4 Pathogenic:1

Nov 25, 2019

UOS Fisiopatologia delle Anemie, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milano

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

BLOOD GROUP--DIEGO SYSTEM;C1832168:BLOOD GROUP--FROESE;C1832169:BLOOD GROUP--SWANN SYSTEM;C1861453:Cryohydrocytosis;C1862190:BLOOD GROUP--WRIGHT ANTIGEN;C1862191:BLOOD GROUP--WALDNER TYPE;C1862322:Southeast Asian ovalocytosis;C1970028:Malaria, susceptibility to;C2675212:Hereditary spherocytosis type 4;C5436235:Renal tubular acidosis, distal, 4, with hemolytic anemia;CN280572:Autosomal dominant distal renal tubular acidosis Uncertain:1

-

Juno Genomics, Hangzhou Juno Genomics, Inc

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

PM2_Supporting+PP3+PP4+PS4_Supporting -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.77
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.41
CADD	Pathogenic	33
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.90	D;T
Eigen	Pathogenic	0.96
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D;D
M_CAP	Uncertain	0.14	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Pathogenic	3.9	H;.
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-7.7	D;.
REVEL	Pathogenic	0.95
Sift	Uncertain	0.0010	D;.
Sift4G	Uncertain	0.0020	D;D
Polyphen		1.0	D;.
Vest4		0.98
MutPred		0.95		Loss of helix (P = 0.0444);.;
MVP		0.94
MPC		1.3
ClinPred		1.0	D
GERP RS		5.1
Varity_R		0.97
gMVP		0.97

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.97
SpliceAI score (max)		0.10		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-42328956;