3-39383422-A-C

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_017875.4(SLC25A38):c.-303A>C variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00559 in 423,062 control chromosomes in the GnomAD database, including 51 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.013 (42 hom., cov: 33)
  • Exomes 𝑓: 0.0016 (9 hom.)
• Consequence: SLC25A38 NM_017875.4 5_prime_UTR
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: -0.383

Genes affected

SLC25A38 (HGNC:26054): (solute carrier family 25 member 38) This gene is a member of the mitochondrial carrier family. The encoded protein is required during erythropoiesis and is important for the biosynthesis of heme. Mutations in this gene are the cause of autosomal congenital sideroblastic anemia (anemia, sideroblastic, 2, pyridoxine-refractory). A related pseudogene is found on chromosome 1. [provided by RefSeq, Aug 2017]

(HGNC:):

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).
• BP6: Variant 3-39383422-A-C is Benign according to our data. Variant chr3-39383422-A-C is described in ClinVar as [Likely_benign]. Clinvar id is 345134.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0127 (1930/152242) while in subpopulation AFR AF= 0.0439 (1823/41556). AF 95% confidence interval is 0.0422. There are 42 homozygotes in gnomad4. There are 909 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd at 42 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SLC25A38	NM_017875.4	c.-303A>C		5_prime_UTR_variant	1/7	ENST00000650617.1
LOC105377644	XR_007096252.1	n.86-378T>G		intron_variant, non_coding_transcript_variant
SLC25A38	NM_001354798.2	c.-303A>C		5_prime_UTR_variant	1/6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC25A38	ENST00000650617.1	c.-303A>C		5_prime_UTR_variant	1/7		NM_017875.4	P1
	ENST00000655387.1	n.61-378T>G		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes AF: 0.0126 AC: 1923 AN: 152124 Hom.: 42 Cov.: 33

Gnomad AFR AF: 0.0439

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00484

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000882

Gnomad OTH AF: 0.0105

GnomAD4 exome AF: 0.00161 AC: 436 AN: 270820 Hom.: 9 Cov.: 0 AF XY: 0.00143 AC XY: 205 AN XY: 143710

Gnomad4 AFR exome AF: 0.0425

Gnomad4 AMR exome AF: 0.00306

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000655

Gnomad4 SAS exome AF: 0.000137

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000627

Gnomad4 OTH exome AF: 0.00282

GnomAD4 genome AF: 0.0127 AC: 1930 AN: 152242 Hom.: 42 Cov.: 33 AF XY: 0.0122 AC XY: 909 AN XY: 74450

Gnomad4 AFR AF: 0.0439

Gnomad4 AMR AF: 0.00484

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000882

Gnomad4 OTH AF: 0.0123

Alfa AF: 0.00198 Hom.: 0

Bravo AF: 0.0147

Asia WGS AF: 0.00549 AC: 19 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jun 28, 2018

- -

X-linked sideroblastic anemia 1 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Sideroblastic anemia 2 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
Cadd	Benign	5.7
Dann	Benign	0.53

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

Publications

LitVar

Other links and lift over

dbSNP: rs114422738; hg19: chr3-39424913;