chr22-19177727-C-T

Variant names:

• chr22-19177727-C-T
• rs1555922904
• NM_005984.5:c.441G>A

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_005984.5(SLC25A1):​c.441G>A​(p.Lys147Lys) variant causes a splice region, synonymous change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SLC25A1 NM_005984.5 splice_region, synonymous
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.11

Genes affected

SLC25A1 (HGNC:10979): (solute carrier family 25 member 1) This gene encodes a member of the mitochondrial carrier subfamily of solute carrier proteins. Members of this family include nuclear-encoded transporters that translocate small metabolites across the mitochondrial membrane. This protein regulates the movement of citrate across the inner membranes of the mitochondria. Mutations in this gene have been associated with combined D-2- and L-2-hydroxyglutaric aciduria. Pseudogenes of this gene have been identified on chromosomes 7, 11, 16, and 19. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2013]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 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, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC25A1	NM_005984.5	c.441G>A	p.Lys147Lys	splice_region_variant, synonymous_variant	Exon 4 of 9	ENST00000215882.10	NP_005975.1
SLC25A1	NM_001256534.2	c.462G>A	p.Lys154Lys	splice_region_variant, synonymous_variant	Exon 3 of 8		NP_001243463.1
SLC25A1	NM_001287387.2	c.132G>A	p.Lys44Lys	splice_region_variant, synonymous_variant	Exon 4 of 9		NP_001274316.1
SLC25A1	NR_046298.3	n.365+215G>A		intron_variant	Intron 3 of 7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC25A1	ENST00000215882.10	c.441G>A	p.Lys147Lys	splice_region_variant, synonymous_variant	Exon 4 of 9	1	NM_005984.5	ENSP00000215882.5
SLC25A1	ENST00000451283.5	c.132G>A	p.Lys44Lys	splice_region_variant, synonymous_variant	Exon 4 of 9	2		ENSP00000401480.1
SLC25A1	ENST00000461267.1	n.587G>A		splice_region_variant, non_coding_transcript_exon_variant	Exon 3 of 6	3
SLC25A1	ENST00000470922.5	n.583G>A		splice_region_variant, non_coding_transcript_exon_variant	Exon 3 of 8	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Oct 27, 2017

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

Nov 01, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. ClinVar contains an entry for this variant (Variation ID: 522133). This variant has not been reported in the literature in individuals affected with SLC25A1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change affects codon 147 of the SLC25A1 mRNA. It is a 'silent' change, meaning that it does not change the encoded amino acid sequence of the SLC25A1 protein. This variant also falls at the last nucleotide of exon 4, which is part of the consensus splice site for this exon. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.30
CADD	Uncertain	24
DANN	Benign	0.97

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.99
SpliceAI score (max)		0.86		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.41		Position offset: -39
DS_DL_spliceai		0.86		Position offset: 0

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

Publications

LitVar

Other links and lift over

dbSNP: rs1555922904; hg19: chr22-19165240;