rs145502796

Variant names:

• chr17-44262740-C-T
• rs145502796
• NM_000342.4:c.16-14G>A

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_000342.4(SLC4A1):​c.16-14G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0186 in 1,613,072 control chromosomes in the GnomAD database, including 322 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.014 (24 hom., cov: 32)
  • Exomes 𝑓: 0.019 (298 hom.)
• Consequence: SLC4A1 NM_000342.4 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:9
• Conservation: PhyloP100: -0.355
• Publications: 3 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: Orphanet, Labcorp Genetics (formerly Invitae), G2P
• cryohydrocytosis

  Inheritance: AD, Unknown Classification: STRONG, SUPPORTIVE, LIMITED Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), PanelApp Australia
• hereditary spherocytosis type 4

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

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

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

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).
• BP6: Variant 17-44262740-C-T is Benign according to our data. Variant chr17-44262740-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 255906.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.0135 (2062/152314) while in subpopulation NFE AF = 0.0201 (1370/68018). AF 95% confidence interval is 0.0193. There are 24 homozygotes in GnomAd4. There are 1022 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 24 AD,AR,Unknown gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000342.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC4A1	NM_000342.4	MANE Select	c.16-14G>A		intron	N/A	NP_000333.1	P02730-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SLC4A1	ENST00000262418.12	TSL:1 MANE Select	c.16-14G>A		intron	N/A	ENSP00000262418.6	P02730-1
	SLC4A1	ENST00000399246.3	TSL:5	c.16-14G>A		intron	N/A	ENSP00000382190.3	A0A0A0MS98
	SLC4A1	ENST00000498270.1	TSL:5	n.283G>A		non_coding_transcript_exon	Exon 2 of 4

Frequencies

GnomAD3 genomes AF: 0.0135 AC: 2062 AN: 152196 Hom.: 24 Cov.: 32

Gnomad AFR AF: 0.00412

Gnomad AMI AF: 0.00219

Gnomad AMR AF: 0.0158

Gnomad ASJ AF: 0.00662

Gnomad EAS AF: 0.000770

Gnomad SAS AF: 0.0149

Gnomad FIN AF: 0.0140

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.0202

Gnomad OTH AF: 0.0129

GnomAD2 exomes AF: 0.0136 AC: 3410 AN: 251380 AF XY: 0.0140

Gnomad AFR exome AF: 0.00400

Gnomad AMR exome AF: 0.00879

Gnomad ASJ exome AF: 0.00437

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.0129

Gnomad NFE exome AF: 0.0195

Gnomad OTH exome AF: 0.0127

GnomAD4 exome AF: 0.0192 AC: 27975 AN: 1460758 Hom.: 298 Cov.: 31 AF XY: 0.0190 AC XY: 13808 AN XY: 726758

African (AFR) AF: 0.00350 AC: 117 AN: 33462

American (AMR) AF: 0.00906 AC: 405 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00517 AC: 135 AN: 26124

East Asian (EAS) AF: 0.0000756 AC: 3 AN: 39694

South Asian (SAS) AF: 0.0143 AC: 1236 AN: 86250

European-Finnish (FIN) AF: 0.0129 AC: 690 AN: 53414

Middle Eastern (MID) AF: 0.00884 AC: 51 AN: 5766

European-Non Finnish (NFE) AF: 0.0219 AC: 24327 AN: 1110964

Other (OTH) AF: 0.0167 AC: 1011 AN: 60360

GnomAD4 genome AF: 0.0135 AC: 2062 AN: 152314 Hom.: 24 Cov.: 32 AF XY: 0.0137 AC XY: 1022 AN XY: 74478

African (AFR) AF: 0.00411 AC: 171 AN: 41582

American (AMR) AF: 0.0158 AC: 241 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.00662 AC: 23 AN: 3472

East Asian (EAS) AF: 0.000771 AC: 4 AN: 5186

South Asian (SAS) AF: 0.0153 AC: 74 AN: 4826

European-Finnish (FIN) AF: 0.0140 AC: 149 AN: 10622

Middle Eastern (MID) AF: 0.00680 AC: 2 AN: 294

European-Non Finnish (NFE) AF: 0.0201 AC: 1370 AN: 68018

Other (OTH) AF: 0.0123 AC: 26 AN: 2116

Alfa AF: 0.0121 Hom.: 6

Bravo AF: 0.0127

Asia WGS AF: 0.00404 AC: 16 AN: 3478

ClinVar

ClinVar submissions

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	5	not provided (5)
-	-	1	Autosomal dominant distal renal tubular acidosis (1)
-	-	1	Hemolytic anemia (1)
-	-	1	Hereditary spherocytosis type 4 (1)
-	-	1	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.82
CADD	Benign	1.1
DANN	Benign	0.38
PhyloP100		-0.35
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs145502796; hg19: chr17-42340108;