10-101062739-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_030929.5(KAZALD1):c.147G>C(p.Glu49Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000504 in 1,389,760 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000050 (0 hom.)
• Consequence: KAZALD1 NM_030929.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.92

Genes affected

KAZALD1 (HGNC:25460): (Kazal type serine peptidase inhibitor domain 1) This gene encodes a secreted member of the insulin growth factor-binding protein (IGFBP) superfamily. The protein contains an insulin growth factor-binding domain in its N-terminal region, a Kazal-type serine protease inhibitor and follistatin-like domain in its central region, and an immunoglobulin-like domain in its C-terminal region. Studies of the mouse ortholog suggest that this protein may function in bone development and bone regeneration. This gene is hypomethylated and over-expressed in high-grade glioma compared to low-grade glioma, and thus the hypomethylated gene may be associated with cell proliferation and the shorter survival of patients with high-grade glioma. It is also one of numerous genes found to be deleted in a novel 5.54 Mb interstitial deletion, which is associated with multiple congenital anomalies. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.302805).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KAZALD1	NM_030929.5	c.147G>C	p.Glu49Asp	missense_variant	2/5	ENST00000370200.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KAZALD1	ENST00000370200.6	c.147G>C	p.Glu49Asp	missense_variant	2/5	1	NM_030929.5	P1
KAZALD1	ENST00000470106.1	n.44-247G>C		intron_variant, non_coding_transcript_variant		3
KAZALD1	ENST00000477979.5	n.112+624G>C		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000504 AC: 7 AN: 1389760 Hom.: 0 Cov.: 32 AF XY: 0.00000436 AC XY: 3 AN XY: 687974

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000553

Gnomad4 OTH exome AF: 0.0000173

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.00000378

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

May 27, 2022

The c.147G>C (p.E49D) alteration is located in exon 2 (coding exon 1) of the KAZALD1 gene. This alteration results from a G to C substitution at nucleotide position 147, causing the glutamic acid (E) at amino acid position 49 to be replaced by an aspartic acid (D). 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	Uncertain	0.43
BayesDel_addAF	Benign	-0.033	T
BayesDel_noAF	Benign	-0.28
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Benign	0.0093	T
Eigen	Uncertain	0.47
Eigen_PC	Uncertain	0.45
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.77	T
M_CAP	Benign	0.047	D
MetaRNN	Benign	0.30	T
MetaSVM	Benign	-0.53	T
MutationAssessor	Uncertain	2.4	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-1.0	N
REVEL	Benign	0.14
Sift	Uncertain	0.021	D
Sift4G	Uncertain	0.048	D
Polyphen		0.99	D
Vest4		0.35
MutPred		0.24		Loss of sheet (P = 0.0037);
MVP		0.67
MPC		1.0
ClinPred		0.89	D
GERP RS		4.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.12
gMVP		0.50

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

Publications

LitVar

Other links and lift over

dbSNP: rs1223897059; hg19: chr10-102822496;