chr22-30607298-A-G

Variant names:

• chr22-30607298-A-G
• rs199511962
• NM_000355.4:c.-34A>G

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_Strong BS1_Supporting BS2

The NM_000355.4(TCN2):​c.-34A>G variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000128 in 1,613,806 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.000092 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00013 (4 hom.)
• Consequence: TCN2 NM_000355.4 5_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: -0.133
• Publications: 0 publications found

Genes affected

TCN2 (HGNC:11653): (transcobalamin 2) This gene encodes a member of the vitamin B12-binding protein family. This family of proteins, alternatively referred to as R binders, is expressed in various tissues and secretions. This plasma protein binds cobalamin and mediates the transport of cobalamin into cells. This protein and other mammalian cobalamin-binding proteins, such as transcobalamin I and gastric intrisic factor, may have evolved by duplication of a common ancestral gene. Alternative splicing results in multiple transcript variants.[provided by RefSeq, May 2010]

PES1 (HGNC:8848): (pescadillo ribosomal biogenesis factor 1) This gene encodes a nuclear protein that contains a breast cancer associated gene 1 (BRCA1) C-terminal interaction domain. The encoded protein interacts with BOP1 and WDR12 to form the PeBoW complex, which plays a critical role in cell proliferation via pre-rRNA processing and 60S ribosomal subunit maturation. Expression of this gene may play an important role in breast cancer proliferation and tumorigenicity. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. Pseudogenes of this gene are located on the long arm of chromosome 4 and the short arm of chromosome 9. [provided by RefSeq, Aug 2011]

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BS1: Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000092 (14/152160) while in subpopulation SAS AF = 0.00124 (6/4822). AF 95% confidence interval is 0.000542. There are 0 homozygotes in GnomAd4. There are 9 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAdExome4 at 4 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000355.4. 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
	TCN2	NM_000355.4	MANE Select	c.-34A>G		5_prime_UTR	Exon 1 of 9	NP_000346.2
	TCN2	NM_001184726.2		c.-34A>G		5_prime_UTR	Exon 1 of 9	NP_001171655.1	P20062-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TCN2	ENST00000215838.8	TSL:1 MANE Select	c.-34A>G		5_prime_UTR	Exon 1 of 9	ENSP00000215838.3	P20062-1
	TCN2	ENST00000407817.3	TSL:1	c.-34A>G		5_prime_UTR	Exon 1 of 9	ENSP00000384914.3	P20062-2
	TCN2	ENST00000947107.1		c.-34A>G		5_prime_UTR	Exon 1 of 10	ENSP00000617166.1

Frequencies

GnomAD3 genomes AF: 0.0000921 AC: 14 AN: 152042 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00124

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000103

Gnomad OTH AF: 0.000479

GnomAD2 exomes AF: 0.000163 AC: 41 AN: 251448 AF XY: 0.000221

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: 0.000132

Gnomad OTH exome AF: 0.000489

GnomAD4 exome AF: 0.000131 AC: 192 AN: 1461646 Hom.: 4 Cov.: 31 AF XY: 0.000165 AC XY: 120 AN XY: 727140

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.0000894 AC: 4 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39698

South Asian (SAS) AF: 0.00109 AC: 94 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53414

Middle Eastern (MID) AF: 0.00226 AC: 13 AN: 5754

European-Non Finnish (NFE) AF: 0.0000612 AC: 68 AN: 1111808

Other (OTH) AF: 0.000215 AC: 13 AN: 60386

GnomAD4 genome AF: 0.0000920 AC: 14 AN: 152160 Hom.: 0 Cov.: 32 AF XY: 0.000121 AC XY: 9 AN XY: 74384

African (AFR) AF: 0.00 AC: 0 AN: 41496

American (AMR) AF: 0.00 AC: 0 AN: 15294

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3466

East Asian (EAS) AF: 0.00 AC: 0 AN: 5152

South Asian (SAS) AF: 0.00124 AC: 6 AN: 4822

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10594

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.000103 AC: 7 AN: 68020

Other (OTH) AF: 0.000474 AC: 1 AN: 2110

Alfa AF: 0.000304 Hom.: 0

Bravo AF: 0.0000718

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	not provided (1)
-	1	-	Transcobalamin II deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	5.2
DANN	Benign	0.59
PhyloP100		-0.13
PromoterAI		0.045	Neutral
Mutation Taster		=296/4	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: rs199511962; hg19: chr22-31003285;