chr17-39909987-T-A

Variant names:

• chr17-39909987-T-A
• rs2290400
• NM_001165958.2:c.408-63A>T

GermlineCancer (beta)

Variant summary

Our verdict is Uncertain significance.

+2 Uncertain · Warm

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 2 classification points (ACGS-UK Somatic Oncogenicity v2025). O3_Moderate

The NM_001165958.2(GSDMB):c.408-63A>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The gene GSDMB is a known oncogene (CancerMine: 6 oncogene citations). The variant is absent from the gnomAD population database at sites with sufficient sequencing coverage. In-silico predictor (BayesDel (noAF)) classifies this variant as likely benign. Splicing prediction tools (SpliceAI) predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: GSDMB NM_001165958.2 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.18
• Publications: 2 publications found

Genes affected

GSDMB (HGNC:23690): (gasdermin B) This gene encodes a member of the gasdermin-domain containing protein family. Other gasdermin-family genes are implicated in the regulation of apoptosis in epithelial cells, and are linked to cancer. Alternative splicing and the use of alternative promoters results in multiple transcript variants. Additional variants have been described, but they are candidates for nonsense-mediated mRNA decay (NMD) and are unlikely to be protein-coding. [provided by RefSeq, Nov 2016]

Classification according to ACGS-UK Somatic Oncogenicity v2025

Classification was made for transcript:

Our verdict: Uncertain_significance. The variant received 2 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	O3Absent or very rare in population		Absent or extremely rare in gnomAD (AC ≤ 2) — O3 moderate; GnomAD: AF = absent, AC = 0 — absent/extremely rare (O3 moderate [+2])

Variant Effect in Transcripts

Automated classification analysis was done for transcript: NM_001165958.2. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	GSDMB NM_001165958.2	MANE Select	c.408-63A>T	intron	Intron 3 of 10	Prot: NP_001159430.1 UniProt:
	GSDMB NM_001388420.1		c.408-63A>T	intron	Intron 2 of 9	Prot: NP_001375349.1 UniProt:
	GSDMB NM_001165959.2		c.408-63A>T	intron	Intron 3 of 9	Prot: NP_001159431.1 UniProt:

GSDMB NM_001165958.2

MANE Select

HGVSc / HGVSpc.408-63A>T

Exon rankIntron 3 of 10

intron

Prot: NP_001159430.1UniProt: Q8TAX9-4

GSDMB NM_001388420.1

HGVSc / HGVSpc.408-63A>T

Exon rankIntron 2 of 9

intron

Prot: NP_001375349.1UniProt: Q8TAX9-4

GSDMB NM_001165959.2

HGVSc / HGVSpc.408-63A>T

Exon rankIntron 3 of 9

intron

Prot: NP_001159431.1UniProt: Q8TAX9-6

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	GSDMB ENST00000418519.6	TSL:5MANE Select	c.408-63A>T	intron	Intron 3 of 10	Prot: ENSP00000415049.1 UniProt:
	GSDMB ENST00000360317.7	TSL:1	c.408-63A>T	intron	Intron 2 of 9	Prot: ENSP00000353465.3 UniProt:
	GSDMB ENST00000394179.5	TSL:1	c.408-63A>T	intron	Intron 2 of 8	Prot: ENSP00000377733.2 UniProt:

GSDMB ENST00000418519.6

TSL:5MANE Select

HGVSc / HGVSpc.408-63A>T

Exon rankIntron 3 of 10

intron

Prot: ENSP00000415049.1UniProt: Q8TAX9-4

GSDMB ENST00000360317.7

TSL:1

HGVSc / HGVSpc.408-63A>T

Exon rankIntron 2 of 9

intron

Prot: ENSP00000353465.3UniProt: Q8TAX9-4

GSDMB ENST00000394179.5

TSL:1

HGVSc / HGVSpc.408-63A>T

Exon rankIntron 2 of 8

intron

Prot: ENSP00000377733.2UniProt: Q8TAX9-3

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 3 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:32
GnomAD4 exome Warning	AF: 0.00	AC:0	Hom:0	AN:1116878	Cov:
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:32
Local & regional cohorts 1 source Population-specific and national genomic databases
ToMMo 61KJPN (+60KJPN MNV)	AF: 0.00	AC:0	Hom:0	AN:122366	Cov:

Showing 4 sources

ClinVar

Not reported in ClinVar

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Benign	4.2
BayesDel_noAF	Benign	-0.87
CADD	Benign	0.53
DANN	Benign	0.49
GPN-Star LLR	N/A	2.4
GPN-Star score	N/A	-2.4
PhyloP100	Benign	-1.2

Showing 7 of 7 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.0
SpliceAI score (max)	Benign	0.0	Details are displayed if max score is > 0.2

Showing 2 of 2 scores

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs2290400;

hg19: chr17-38066240;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar