18-23019601-A-G

Variant names:

• chr18-23019601-A-G
• rs7234479
• NM_002894.3:c.2455-2528A>G

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_Strong BS1

The NM_002894.3(RBBP8):​c.2455-2528A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000335 in 152,042 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 0.00034 (0 hom., cov: 32)
• Consequence: RBBP8 NM_002894.3 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -4.06
• Publications: 6 publications found

Genes affected

RBBP8 (HGNC:9891): (RB binding protein 8, endonuclease) The protein encoded by this gene is a ubiquitously expressed nuclear protein. It is found among several proteins that bind directly to retinoblastoma protein, which regulates cell proliferation. This protein complexes with transcriptional co-repressor CTBP. It is also associated with BRCA1 and is thought to modulate the functions of BRCA1 in transcriptional regulation, DNA repair, and/or cell cycle checkpoint control. It is suggested that this gene may itself be a tumor suppressor acting in the same pathway as BRCA1. Three transcript variants encoding two different isoforms have been found for this gene. More transcript variants exist, but their full-length natures have not been determined. [provided by RefSeq, Jul 2008]

RBBP8 Gene-Disease associations (from GenCC):

• Jawad syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet
• Seckel syndrome 2

  Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics
• Seckel syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Benign. The variant received -8 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BS1: Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000335 (51/152042) while in subpopulation AFR AF = 0.00101 (42/41434). AF 95% confidence interval is 0.00077. There are 0 homozygotes in GnomAd4. There are 31 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002894.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RBBP8	NM_002894.3	MANE Select	c.2455-2528A>G		intron	N/A	NP_002885.1
	RBBP8	NM_203291.2		c.2455-2528A>G		intron	N/A	NP_976036.1
	RBBP8	NM_203292.2		c.2358-2528A>G		intron	N/A	NP_976037.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RBBP8	ENST00000327155.10	TSL:1 MANE Select	c.2455-2528A>G		intron	N/A	ENSP00000323050.5
	RBBP8	ENST00000360790.9	TSL:1	c.2470-2528A>G		intron	N/A	ENSP00000354024.5
	RBBP8	ENST00000399722.6	TSL:1	c.2455-2528A>G		intron	N/A	ENSP00000382628.2

Frequencies

GnomAD3 genomes AF: 0.000303 AC: 46 AN: 151924 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000896

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000525

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

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

GnomAD4 genome AF: 0.000335 AC: 51 AN: 152042 Hom.: 0 Cov.: 32 AF XY: 0.000417 AC XY: 31 AN XY: 74318

African (AFR) AF: 0.00101 AC: 42 AN: 41434

American (AMR) AF: 0.000524 AC: 8 AN: 15266

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5180

South Asian (SAS) AF: 0.000207 AC: 1 AN: 4822

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10570

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67986

Other (OTH) AF: 0.00 AC: 0 AN: 2108

Alfa AF: 0.00 Hom.: 677

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	0.0030
DANN	Benign	0.81
PhyloP100		-4.1

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

Other links and lift over

dbSNP: rs7234479; hg19: chr18-20599564;