chr20-18507893-C-G

Variant names:

• chr20-18507893-C-G
• rs886056523
• ENST00000336714.8:c.-112C>G

Variant summary

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

The ENST00000336714.8(SEC23B):​c.-112C>G variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 34)
• Consequence: SEC23B ENST00000336714.8 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.295
• Publications: 0 publications found

Genes affected

SEC23B (HGNC:10702): (SEC23 homolog B, COPII coat complex component) The protein encoded by this gene is a member of the SEC23 subfamily of the SEC23/SEC24 family, which is involved in vesicle trafficking. The encoded protein has similarity to yeast Sec23p component of COPII. COPII is the coat protein complex responsible for vesicle budding from the ER. The function of this gene product has been implicated in cargo selection and concentration. Multiple alternatively spliced transcript variants have been identified in this gene. [provided by RefSeq, Feb 2010]

SEC23B Gene-Disease associations (from GenCC):

• congenital dyserythropoietic anemia type 2

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet, G2P, PanelApp Australia, Laboratory for Molecular Medicine
• Cowden disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Cowden syndrome 7

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• congenital dyserythropoietic anemia

  Inheritance: AR Classification: LIMITED Submitted by: Genomics England PanelApp

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=-0.57).

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000336714.8. 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
	SEC23B	NM_032986.5		c.-15+224C>G		intron	N/A	NP_116781.1	Q15437
	SEC23B	NM_006363.6	MANE Select	c.-94C>G		upstream_gene	N/A	NP_006354.2
	SEC23B	NM_001172745.3		c.-419C>G		upstream_gene	N/A	NP_001166216.1	Q15437

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SEC23B	ENST00000336714.8	TSL:1	c.-112C>G		5_prime_UTR_premature_start_codon_gain	Exon 1 of 20	ENSP00000338844.3	Q15437
	SEC23B	ENST00000336714.8	TSL:1	c.-112C>G		5_prime_UTR	Exon 1 of 20	ENSP00000338844.3	Q15437
	SEC23B	ENST00000262544.6	TSL:5	c.-152C>G		5_prime_UTR_premature_start_codon_gain	Exon 1 of 20	ENSP00000262544.2	Q15437

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 34

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Congenital dyserythropoietic anemia (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.57
CADD	Benign	14
DANN	Benign	0.93
PhyloP100		-0.29
PromoterAI		0.018	Neutral

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: rs886056523; hg19: chr20-18488537;