10-68288551-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_022129.4(PBLD):c.623C>T(p.Thr208Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000103 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000010 (0 hom.)
• Consequence: PBLD NM_022129.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.103

Genes affected

PBLD (HGNC:23301): (phenazine biosynthesis like protein domain containing) Enables identical protein binding activity. Involved in maintenance of gastrointestinal epithelium; negative regulation of SMAD protein signal transduction; and negative regulation of transforming growth factor beta receptor signaling pathway. Located in cytoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.061404675).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PBLD	NM_022129.4	c.623C>T	p.Thr208Ile	missense_variant	8/10	ENST00000358769.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PBLD	ENST00000358769.7	c.623C>T	p.Thr208Ile	missense_variant	8/10	5	NM_022129.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000103 AC: 15 AN: 1461890 Hom.: 0 Cov.: 31 AF XY: 0.0000124 AC XY: 9 AN XY: 727244

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000104

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000540

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 12, 2021

The c.623C>T (p.T208I) alteration is located in exon 8 (coding exon 7) of the PBLD gene. This alteration results from a C to T substitution at nucleotide position 623, causing the threonine (T) at amino acid position 208 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.29	T
BayesDel_noAF	Benign	-0.66
Cadd	Benign	5.6
Dann	Benign	0.74
DEOGEN2	Benign	0.024	T;T;T;.
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.079	N
LIST_S2	Benign	0.60	T;T;.;T
M_CAP	Benign	0.0089	T
MetaRNN	Benign	0.061	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-0.98	N;N;N;.
REVEL	Benign	0.011
Sift	Benign	0.19	T;T;T;.
Sift4G	Benign	0.18	T;T;T;T
Polyphen		0.0010	.;B;B;.
Vest4		0.12
MutPred		0.57		.;Loss of disorder (P = 0.027);Loss of disorder (P = 0.027);Loss of disorder (P = 0.027);
MVP		0.061
MPC		0.18
ClinPred		0.037	T
GERP RS		-0.25
Varity_R		0.032
gMVP		0.27

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs2044316733; hg19: chr10-70048308;