chr7-99735244-G-A

Variant names:

• chr7-99735244-G-A
• rs45496695
• XR_007059988.1:n.1429-1448G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The XR_007059988.1(ZSCAN25):​n.1429-1448G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000032 in 938,286 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: not found (cov: 32)
  • Exomes 𝑓: 0.0000032 (0 hom.)
• Consequence: ZSCAN25 XR_007059988.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.327
• Publications: 2 publications found

Genes affected

ZSCAN25 (HGNC:21961): (zinc finger and SCAN domain containing 25) This gene encodes a protein that bears some similarity to zinc finger proteins, which are involved in DNA binding and protein-protein interactions. Multiple alternatively spliced transcript variants have been identified, but the full-length nature for most of them has not been determined. [provided by RefSeq, Jul 2008]

CYP3A7 (HGNC:2640): (cytochrome P450 family 3 subfamily A member 7) This gene encodes a member of the cytochrome P450 superfamily of enzymes, which participate in drug metabolism and the synthesis of cholesterol, steroids and other lipids. This enzyme hydroxylates testosterone and dehydroepiandrosterone 3-sulphate, which is involved in the formation of estriol during pregnancy. This gene is part of a cluster of related genes on chromosome 7q21.1. Naturally-occurring readthrough transcription occurs between this gene and the downstream CYP3A51P pseudogene and is represented by GeneID:100861540. [provided by RefSeq, Jan 2015]

CYP3A7-CYP3A51P (HGNC:51504): (CYP3A7-CYP3A51P readthrough) This locus represents readthrough transcription between the neighboring CYP3A7 (cytochrome P450, family 3, subfamily A, polypeptide 7) and CYP3A51P (cytochrome P450, family 3, subfamily A, polypeptide 51, pseudogene) genes, which are members of the CYP3A gene cluster on chromosome 7. The downstream pseudogene is not known to be independently transcribed. The readthrough transcript includes CYP3A7 exons 1-13 and exons 2 and 13 of the pseudogene. It encodes a CYP3A isoform with a novel C-terminus. This isoform is only expressed in alleles containing a T nucleotide at the -6 position of a splice acceptor in the pseudogene, which enables correct splicing of the upstream CYP3A7 exons to the pseudogene exons. It should be noted that the reference genome sequence represents the CYP3A7_39256 T->A allele, and thus this haplotype is unlikely to produce the readthrough transcript. [provided by RefSeq, Jan 2015]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000336374.4. 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
	CYP3A7	NM_000765.5	MANE Select	c.-151C>T		upstream_gene	N/A	NP_000756.3
	CYP3A7-CYP3A51P	NM_001256497.3		c.-151C>T		upstream_gene	N/A	NP_001243426.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CYP3A7	ENST00000336374.4	TSL:1 MANE Select	c.-151C>T		upstream_gene	N/A	ENSP00000337450.2
	CYP3A7-CYP3A51P	ENST00000620220.6	TSL:1	c.-151C>T		upstream_gene	N/A	ENSP00000479282.3
	CYP3A7-CYP3A51P	ENST00000611620.4	TSL:5	c.-151C>T		upstream_gene	N/A	ENSP00000480571.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000320 AC: 3 AN: 938286 Hom.: 0 Cov.: 12 AF XY: 0.00000418 AC XY: 2 AN XY: 478432

African (AFR) AF: 0.00 AC: 0 AN: 22596

American (AMR) AF: 0.00 AC: 0 AN: 34018

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 21414

East Asian (EAS) AF: 0.00 AC: 0 AN: 32644

South Asian (SAS) AF: 0.00 AC: 0 AN: 68704

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 36982

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4638

European-Non Finnish (NFE) AF: 0.00000445 AC: 3 AN: 674700

Other (OTH) AF: 0.00 AC: 0 AN: 42590

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	2.3
DANN	Benign	0.69
PhyloP100		-0.33
PromoterAI		-0.21	Neutral

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs45496695; hg19: chr7-99332867;