3-27389997-C-G

Variant names:

• chr3-27389997-C-G
• rs139643738
• NM_001321103.2:c.3294G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PP3_Moderate

The NM_001321103.2(SLC4A7):​c.3294G>C​(p.Gln1098His) variant causes a missense change. The variant allele was found at a frequency of 0.000138 in 1,613,708 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000033 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00015 (0 hom.)
• Consequence: SLC4A7 NM_001321103.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.18
• Publications: 2 publications found

Genes affected

SLC4A7 (HGNC:11033): (solute carrier family 4 member 7) This locus encodes a sodium bicarbonate cotransporter. The encoded transmembrane protein appears to transport sodium and bicarbonate ions in a 1:1 ratio, and is thus considered an electroneutral cotransporter. The encoded protein likely plays a critical role in regulation of intracellular pH involved in visual and auditory sensory transmission. Alternatively spliced transcript variants encoding distinct isoforms have been described. [provided by RefSeq, Apr 2012]

SLC4A7 Gene-Disease associations (from GenCC):

• cone-rod dystrophy

  Inheritance: AR Classification: LIMITED Submitted by: Franklin by Genoox

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.894

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC4A7	NM_001321103.2	c.3294G>C	p.Gln1098His	missense_variant	Exon 22 of 26	ENST00000454389.6	NP_001308032.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC4A7	ENST00000454389.6	c.3294G>C	p.Gln1098His	missense_variant	Exon 22 of 26	1	NM_001321103.2	ENSP00000390394.1

Frequencies

GnomAD3 genomes AF: 0.0000329 AC: 5 AN: 152094 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

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: 0.0000588

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000517 AC: 13 AN: 251298 AF XY: 0.0000515

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000968

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.000148 AC: 217 AN: 1461614 Hom.: 0 Cov.: 30 AF XY: 0.000154 AC XY: 112 AN XY: 727146

African (AFR) AF: 0.0000299 AC: 1 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39672

South Asian (SAS) AF: 0.00 AC: 0 AN: 86248

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53410

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.000174 AC: 194 AN: 1111806

Other (OTH) AF: 0.000364 AC: 22 AN: 60386

GnomAD4 genome AF: 0.0000329 AC: 5 AN: 152094 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74294

African (AFR) AF: 0.00 AC: 0 AN: 41394

American (AMR) AF: 0.0000655 AC: 1 AN: 15270

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5194

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10586

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000588 AC: 4 AN: 68036

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.000134 Hom.: 0

Bravo AF: 0.0000529

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000412 AC: 5

EpiCase AF: 0.000273

EpiControl AF: 0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

May 13, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.3267G>C (p.Q1089H) alteration is located in exon 22 (coding exon 22) of the SLC4A7 gene. This alteration results from a G to C substitution at nucleotide position 3267, causing the glutamine (Q) at amino acid position 1089 to be replaced by a histidine (H). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.43
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.93	.;.;D;.;.;.;.;.;.;.;D
Eigen	Pathogenic	0.83
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	1.0	D;D;D;D;D;D;D;D;D;D;D
M_CAP	Uncertain	0.19	D
MetaRNN	Pathogenic	0.89	D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.74	D
MutationAssessor	Pathogenic	3.4	.;.;M;.;.;.;.;.;.;.;.
PhyloP100		6.2
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-4.3	.;D;D;D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.87
Sift	Pathogenic	0.0	.;D;D;D;D;D;D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;D;D;D;D;D;D
Polyphen		1.0	.;.;D;D;.;.;.;.;.;D;.
Vest4		0.93
MutPred		0.75		.;.;Loss of glycosylation at T1086 (P = 0.1809);.;.;.;.;.;.;.;.;
MVP		0.76
MPC		0.96
ClinPred		0.98	D
GERP RS		5.5
Varity_R		0.84
gMVP		0.99
Mutation Taster		=6/94	disease causing

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: rs139643738; hg19: chr3-27431488;