chr22-26555219-C-T

Variant names:

• chr22-26555219-C-T
• rs4822739
• NM_003595.5:c.-160-10544G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_003595.5(TPST2):​c.-160-10544G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000787 in 381,268 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000079 (0 hom.)
• Consequence: TPST2 NM_003595.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.308
• Publications: 18 publications found

Genes affected

TPST2 (HGNC:12021): (tyrosylprotein sulfotransferase 2) The protein encoded by this gene catalyzes the O-sulfation of tyrosine residues within acidic regions of proteins. The encoded protein is a type II integral membrane protein found in the Golgi body. Alternative splicing produces multiple transcript variants encoding distinct isoforms. [provided by RefSeq, May 2018]

MIR548J (HGNC:35276): (microRNA 548j) microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TPST2	NM_003595.5	c.-160-10544G>A		intron_variant	Intron 1 of 6	ENST00000338754.9	NP_003586.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TPST2	ENST00000338754.9	c.-160-10544G>A		intron_variant	Intron 1 of 6	1	NM_003595.5	ENSP00000339813.4

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD2 exomes AF: 0.00000812 AC: 2 AN: 246388 AF XY: 0.00

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: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000787 AC: 3 AN: 381268 Hom.: 0 Cov.: 0 AF XY: 0.00000460 AC XY: 1 AN XY: 217156

⚠️ 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: 10488

American (AMR) AF: 0.00 AC: 0 AN: 36306

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 11744

East Asian (EAS) AF: 0.00 AC: 0 AN: 13174

South Asian (SAS) AF: 0.0000450 AC: 3 AN: 66718

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 32026

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2096

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 192070

Other (OTH) AF: 0.00 AC: 0 AN: 16646

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000034), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	1.9
DANN	Benign	0.66
PhyloP100		-0.31

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: rs4822739; hg19: chr22-26951185;