rs778193022

Variant names:

• chr5-148127054-A-G
• rs778193022
• NM_006846.4:c.2939A>G

Variant summary

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

The NM_006846.4(SPINK5):​c.2939A>G​(p.Asp980Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000547 in 1,461,310 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 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: 0.0000055 (0 hom.)
• Consequence: SPINK5 NM_006846.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.772

Genes affected

SPINK5 (HGNC:15464): (serine peptidase inhibitor Kazal type 5) This gene encodes a multidomain serine protease inhibitor that contains 15 potential inhibitory domains. The encoded preproprotein is proteolytically processed to generate multiple protein products, which may exhibit unique activities and specificities. These proteins may play a role in skin and hair morphogenesis, as well as anti-inflammatory and antimicrobial protection of mucous epithelia. Mutations in this gene may result in Netherton syndrome, a disorder characterized by ichthyosis, defective cornification, and atopy. This gene is present in a gene cluster on chromosome 5. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2015]

FBXO38-DT (HGNC:55589): (FBXO38 divergent transcript)

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=0.0478324).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SPINK5	NM_006846.4	c.2939A>G	p.Asp980Gly	missense_variant	Exon 30 of 33	ENST00000256084.8	NP_006837.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPINK5	ENST00000256084.8	c.2939A>G	p.Asp980Gly	missense_variant	Exon 30 of 33	1	NM_006846.4	ENSP00000256084.7
SPINK5	ENST00000359874.7	c.3029A>G	p.Asp1010Gly	missense_variant	Exon 31 of 34	1		ENSP00000352936.3
FBXO38-DT	ENST00000667608.1	n.1257-33312T>C		intron_variant	Intron 3 of 4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000547 AC: 8 AN: 1461310 Hom.: 0 Cov.: 30 AF XY: 0.00000963 AC XY: 7 AN XY: 726912

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: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000540

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00 AC: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Ichthyosis linearis circumflexa Uncertain:1

Jan 18, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The glycine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with SPINK5-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces aspartic acid with glycine at codon 980 of the SPINK5 protein (p.Asp980Gly). The aspartic acid residue is moderately conserved and there is a moderate physicochemical difference between aspartic acid and glycine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.071
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.73
CADD	Benign	0.18
DANN	Benign	0.83
DEOGEN2	Benign	0.072	.;T
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.019	N
LIST_S2	Benign	0.52	T;T
M_CAP	Benign	0.0027	T
MetaRNN	Benign	0.048	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.3	.;L
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-0.65	N;N
REVEL	Benign	0.0020
Sift	Benign	0.50	T;T
Sift4G	Uncertain	0.028	D;D
Polyphen		0.0070	B;B
Vest4		0.063
MutPred		0.17		.;Gain of relative solvent accessibility (P = 0.0999);
MVP		0.18
MPC		0.13
ClinPred		0.028	T
GERP RS		-1.3
Varity_R		0.040
gMVP		0.39

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: rs778193022; hg19: chr5-147506617;