1-179031008-G-A

Position:

• chr1-179031008-G-A

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_014864.4(FAM20B):​c.-134+4910G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.771 in 152,094 control chromosomes in the GnomAD database, including 46,119 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.77 (46119 hom., cov: 31)
• Consequence: FAM20B NM_014864.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.161

Genes affected

FAM20B (HGNC:23017): (FAM20B glycosaminoglycan xylosylkinase) Enables phosphotransferase activity, alcohol group as acceptor. Predicted to be involved in proteoglycan biosynthetic process. Located in Golgi apparatus and nucleoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.923 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FAM20B	NM_014864.4	c.-134+4910G>A		intron_variant		ENST00000263733.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FAM20B	ENST00000263733.5	c.-134+4910G>A		intron_variant		1	NM_014864.4	P1
FAM20B	ENST00000440702.5	c.-134+5150G>A		intron_variant		3

Frequencies

GnomAD3 genomes AF: 0.771 AC: 117147 AN: 151976 Hom.: 46073 Cov.: 31

Gnomad AFR AF: 0.931

Gnomad AMI AF: 0.577

Gnomad AMR AF: 0.692

Gnomad ASJ AF: 0.798

Gnomad EAS AF: 0.646

Gnomad SAS AF: 0.718

Gnomad FIN AF: 0.804

Gnomad MID AF: 0.725

Gnomad NFE AF: 0.701

Gnomad OTH AF: 0.759

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.771 AC: 117246 AN: 152094 Hom.: 46119 Cov.: 31 AF XY: 0.774 AC XY: 57499 AN XY: 74330

Gnomad4 AFR AF: 0.930

Gnomad4 AMR AF: 0.691

Gnomad4 ASJ AF: 0.798

Gnomad4 EAS AF: 0.646

Gnomad4 SAS AF: 0.717

Gnomad4 FIN AF: 0.804

Gnomad4 NFE AF: 0.701

Gnomad4 OTH AF: 0.762

Alfa AF: 0.721 Hom.: 18088

Bravo AF: 0.767

Asia WGS AF: 0.757 AC: 2635 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	6.1
DANN	Benign	0.42

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: rs6425512; hg19: chr1-179000143;