17-44248849-GTTTTTTTTTTTTTTTT-GTTT

Variant names:

• chr17-44248849-GTTTTTTTTTTTTT-G
• rs57466226
• NM_000342.4:c.*1596_*1608delAAAAAAAAAAAAA

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_000342.4(SLC4A1):​c.*1596_*1608delAAAAAAAAAAAAA variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000153 in 71,762 control chromosomes in the GnomAD database, with no homozygous occurrence. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.00015 (0 hom., cov: 0)
  • Exomes 𝑓: 0.00018 (0 hom.)
• Consequence: SLC4A1 NM_000342.4 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.658
• Publications: 1 publications found

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]

SLC4A1 Gene-Disease associations (from GenCC):

• autosomal dominant distal renal tubular acidosis

  Inheritance: AD, AR Classification: STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae)
• hereditary spherocytosis type 4

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• renal tubular acidosis, distal, 4, with hemolytic anemia

  Inheritance: AD, AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• southeast Asian ovalocytosis

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
• dehydrated hereditary stomatocytosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary spherocytosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• cryohydrocytosis

  Inheritance: Unknown, AD Classification: SUPPORTIVE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC4A1	NM_000342.4	c.*1596_*1608delAAAAAAAAAAAAA		3_prime_UTR_variant	Exon 20 of 20	ENST00000262418.12	NP_000333.1
SLC4A1	XM_011525129.3	c.*1596_*1608delAAAAAAAAAAAAA		3_prime_UTR_variant	Exon 19 of 19		XP_011523431.1
SLC4A1	XM_005257593.6	c.*1596_*1608delAAAAAAAAAAAAA		3_prime_UTR_variant	Exon 18 of 18		XP_005257650.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC4A1	ENST00000262418.12	c.*1596_*1608delAAAAAAAAAAAAA		3_prime_UTR_variant	Exon 20 of 20	1	NM_000342.4	ENSP00000262418.6
SLC4A1	ENST00000399246.3	c.*1596_*1608delAAAAAAAAAAAAA		3_prime_UTR_variant	Exon 15 of 15	5		ENSP00000382190.3

Frequencies

GnomAD3 genomes AF: 0.000148 AC: 9 AN: 60742 Hom.: 0 Cov.: 0

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000234

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000226

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.000181 AC: 2 AN: 11020 Hom.: 0 AF XY: 0.000334 AC XY: 2 AN XY: 5990

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 42

American (AMR) AF: 0.00 AC: 0 AN: 658

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 164

East Asian (EAS) AF: 0.00 AC: 0 AN: 54

South Asian (SAS) AF: 0.00 AC: 0 AN: 1766

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 580

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 32

European-Non Finnish (NFE) AF: 0.000278 AC: 2 AN: 7194

Other (OTH) AF: 0.00 AC: 0 AN: 530

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.000148 AC: 9 AN: 60742 Hom.: 0 Cov.: 0 AF XY: 0.000297 AC XY: 8 AN XY: 26960

African (AFR) AF: 0.00 AC: 0 AN: 12758

American (AMR) AF: 0.000234 AC: 1 AN: 4276

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 1954

East Asian (EAS) AF: 0.00 AC: 0 AN: 1478

South Asian (SAS) AF: 0.00 AC: 0 AN: 1684

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 1858

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 84

European-Non Finnish (NFE) AF: 0.000226 AC: 8 AN: 35350

Other (OTH) AF: 0.00 AC: 0 AN: 756

Alfa AF: 0.00 Hom.: 73

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.66

Splicing

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

Other links and lift over

dbSNP: rs57466226; hg19: chr17-42326217;